Issue #1258 - Part 1: Import mailnews, ldap, and mork from comm-esr52.9.1

45 files changed, 22527 insertions, 0 deletions

diff --git a/mailnews/local/src/moz.build b/mailnews/local/src/moz.build
new file mode 100644
index 000000000..5f999ce46
--- /dev/null
+++ b/mailnews/local/src/moz.build
@@ -0,0 +1,36 @@
+# vim: set filetype=python:
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+SOURCES += [
+    'nsLocalMailFolder.cpp',
+    'nsLocalUndoTxn.cpp',
+    'nsLocalUtils.cpp',
+    'nsMailboxProtocol.cpp',
+    'nsMailboxServer.cpp',
+    'nsMailboxService.cpp',
+    'nsMailboxUrl.cpp',
+    'nsMsgBrkMBoxStore.cpp',
+    'nsMsgLocalStoreUtils.cpp',
+    'nsMsgMaildirStore.cpp',
+    'nsNoIncomingServer.cpp',
+    'nsNoneService.cpp',
+    'nsParseMailbox.cpp',
+    'nsPop3IncomingServer.cpp',
+    'nsPop3Protocol.cpp',
+    'nsPop3Service.cpp',
+    'nsPop3Sink.cpp',
+    'nsPop3URL.cpp',
+    'nsRssIncomingServer.cpp',
+    'nsRssService.cpp',
+]
+
+if CONFIG['MOZ_MOVEMAIL']:
+    SOURCES += [
+        'nsMovemailIncomingServer.cpp',
+        'nsMovemailService.cpp',
+    ]
+
+FINAL_LIBRARY = 'mail'
+
diff --git a/mailnews/local/src/nsLocalMailFolder.cpp b/mailnews/local/src/nsLocalMailFolder.cpp
new file mode 100644
index 000000000..14135fe46
--- /dev/null
+++ b/mailnews/local/src/nsLocalMailFolder.cpp
@@ -0,0 +1,3852 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsIPrefService.h"
+#include "nsIPrefBranch.h"
+#include "prlog.h"
+
+#include "msgCore.h"    // precompiled header...
+#include "nsArrayEnumerator.h"
+#include "nsLocalMailFolder.h"
+#include "nsMsgLocalFolderHdrs.h"
+#include "nsMsgFolderFlags.h"
+#include "nsMsgMessageFlags.h"
+#include "prprf.h"
+#include "prmem.h"
+#include "nsIArray.h"
+#include "nsIServiceManager.h"
+#include "nsIMailboxService.h"
+#include "nsParseMailbox.h"
+#include "nsIMsgAccountManager.h"
+#include "nsIMsgWindow.h"
+#include "nsCOMPtr.h"
+#include "nsIRDFService.h"
+#include "nsMsgDBCID.h"
+#include "nsMsgUtils.h"
+#include "nsLocalUtils.h"
+#include "nsIPop3IncomingServer.h"
+#include "nsILocalMailIncomingServer.h"
+#include "nsIMsgIncomingServer.h"
+#include "nsMsgBaseCID.h"
+#include "nsMsgLocalCID.h"
+#include "nsStringGlue.h"
+#include "nsIMsgFolderCacheElement.h"
+#include "nsUnicharUtils.h"
+#include "nsMsgUtils.h"
+#include "nsICopyMsgStreamListener.h"
+#include "nsIMsgCopyService.h"
+#include "nsMsgTxn.h"
+#include "nsIMessenger.h"
+#include "nsMsgBaseCID.h"
+#include "nsNativeCharsetUtils.h"
+#include "nsIDocShell.h"
+#include "nsIPrompt.h"
+#include "nsIInterfaceRequestor.h"
+#include "nsIInterfaceRequestorUtils.h"
+#include "nsIPop3URL.h"
+#include "nsIMsgMailSession.h"
+#include "nsIMsgFolderCompactor.h"
+#include "nsNetCID.h"
+#include "nsIMsgMailNewsUrl.h"
+#include "nsISpamSettings.h"
+#include "nsINoIncomingServer.h"
+#include "nsNativeCharsetUtils.h"
+#include "nsMailHeaders.h"
+#include "nsCOMArray.h"
+#include "nsILineInputStream.h"
+#include "nsIFileStreams.h"
+#include "nsAutoPtr.h"
+#include "nsIRssIncomingServer.h"
+#include "nsNetUtil.h"
+#include "nsIMsgFolderNotificationService.h"
+#include "nsReadLine.h"
+#include "nsArrayUtils.h"
+#include "nsIMsgTraitService.h"
+#include "nsIStringEnumerator.h"
+#include "mozilla/Services.h"
+
+//////////////////////////////////////////////////////////////////////////////
+// nsLocal
+/////////////////////////////////////////////////////////////////////////////
+
+nsLocalMailCopyState::nsLocalMailCopyState() :
+  m_flags(0),
+  m_lastProgressTime(PR_IntervalToMilliseconds(PR_IntervalNow())),
+  m_curDstKey(nsMsgKey_None),
+  m_curCopyIndex(0),
+  m_totalMsgCount(0),
+  m_dataBufferSize(0),
+  m_leftOver(0),
+  m_isMove(false),
+  m_dummyEnvelopeNeeded(false),
+  m_fromLineSeen(false),
+  m_writeFailed(false),
+  m_notifyFolderLoaded(false)
+{
+}
+
+nsLocalMailCopyState::~nsLocalMailCopyState()
+{
+  PR_Free(m_dataBuffer);
+  if (m_fileStream)
+    m_fileStream->Close();
+  if (m_messageService)
+  {
+    nsCOMPtr <nsIMsgFolder> srcFolder = do_QueryInterface(m_srcSupport);
+    if (srcFolder && m_message)
+    {
+      nsCString uri;
+      srcFolder->GetUriForMsg(m_message, uri);
+    }
+  }
+}
+
+nsLocalFolderScanState::nsLocalFolderScanState() : m_uidl(nullptr)
+{
+}
+
+nsLocalFolderScanState::~nsLocalFolderScanState()
+{
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// nsMsgLocalMailFolder interface
+///////////////////////////////////////////////////////////////////////////////
+
+nsMsgLocalMailFolder::nsMsgLocalMailFolder(void)
+  : mCopyState(nullptr), mHaveReadNameFromDB(false),
+    mInitialized(false),
+    mCheckForNewMessagesAfterParsing(false), m_parsingFolder(false),
+    mDownloadState(DOWNLOAD_STATE_NONE)
+{
+}
+
+nsMsgLocalMailFolder::~nsMsgLocalMailFolder(void)
+{
+}
+
+NS_IMPL_ISUPPORTS_INHERITED(nsMsgLocalMailFolder,
+                             nsMsgDBFolder,
+                             nsICopyMessageListener,
+                             nsIMsgLocalMailFolder)
+
+////////////////////////////////////////////////////////////////////////////////
+
+NS_IMETHODIMP
+nsMsgLocalMailFolder::Init(const char* aURI)
+{
+  return nsMsgDBFolder::Init(aURI);
+}
+
+nsresult nsMsgLocalMailFolder::CreateChildFromURI(const nsCString &uri, nsIMsgFolder **folder)
+{
+  nsMsgLocalMailFolder *newFolder = new nsMsgLocalMailFolder;
+  if (!newFolder)
+    return NS_ERROR_OUT_OF_MEMORY;
+
+  NS_ADDREF(*folder = newFolder);
+  newFolder->Init(uri.get());
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsMsgLocalMailFolder::CreateLocalSubfolder(const nsAString &aFolderName,
+                                                         nsIMsgFolder **aChild)
+{
+  NS_ENSURE_ARG_POINTER(aChild);
+  nsresult rv = CreateSubfolderInternal(aFolderName, nullptr, aChild);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsIMsgFolderNotificationService> notifier(
+    do_GetService(NS_MSGNOTIFICATIONSERVICE_CONTRACTID));
+  if (notifier)
+    notifier->NotifyFolderAdded(*aChild);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsMsgLocalMailFolder::GetManyHeadersToDownload(bool *retval)
+{
+  bool isLocked;
+  // if the folder is locked, we're probably reparsing - let's build the
+  // view when we've finished reparsing.
+  GetLocked(&isLocked);
+  if (isLocked)
+  {
+    *retval = true;
+    return NS_OK;
+  }
+
+  return nsMsgDBFolder::GetManyHeadersToDownload(retval);
+}
+
+//run the url to parse the mailbox
+NS_IMETHODIMP nsMsgLocalMailFolder::ParseFolder(nsIMsgWindow *aMsgWindow,
+                                                nsIUrlListener *aListener)
+{
+  nsCOMPtr<nsIMsgPluggableStore> msgStore;
+  nsresult rv = GetMsgStore(getter_AddRefs(msgStore));
+  NS_ENSURE_SUCCESS(rv, rv);
+  if (aListener != this)
+    mReparseListener = aListener;
+  // if parsing is synchronous, we need to set m_parsingFolder to
+  // true before starting. And we need to open the db before
+  // setting m_parsingFolder to true.
+//  OpenDatabase();
+  rv = msgStore->RebuildIndex(this, mDatabase, aMsgWindow, this);
+  if (NS_SUCCEEDED(rv))
+    m_parsingFolder = true;
+
+  return rv;
+}
+
+// this won't force a reparse of the folder if the db is invalid.
+NS_IMETHODIMP
+nsMsgLocalMailFolder::GetMsgDatabase(nsIMsgDatabase** aMsgDatabase)
+{
+  return GetDatabaseWOReparse(aMsgDatabase);
+}
+
+NS_IMETHODIMP
+nsMsgLocalMailFolder::GetSubFolders(nsISimpleEnumerator **aResult)
+{
+  if (!mInitialized)
+  {
+    nsCOMPtr<nsIMsgIncomingServer> server;
+    nsresult rv = GetServer(getter_AddRefs(server));
+    NS_ENSURE_SUCCESS(rv, NS_MSG_INVALID_OR_MISSING_SERVER);
+    nsCOMPtr<nsIMsgPluggableStore> msgStore;
+    // need to set this flag here to avoid infinite recursion
+    mInitialized = true;
+    rv = server->GetMsgStore(getter_AddRefs(msgStore));
+    NS_ENSURE_SUCCESS(rv, rv);
+    // This should add all existing folders as sub-folders of this folder.
+    rv = msgStore->DiscoverSubFolders(this, true);
+
+    nsCOMPtr<nsIFile> path;
+    rv = GetFilePath(getter_AddRefs(path));
+    if (NS_FAILED(rv))
+      return rv;
+
+    bool directory;
+    path->IsDirectory(&directory);
+    if (directory)
+    {
+      SetFlag(nsMsgFolderFlags::Mail | nsMsgFolderFlags::Elided |
+              nsMsgFolderFlags::Directory);
+
+      bool isServer;
+      GetIsServer(&isServer);
+      if (isServer)
+      {
+        nsCOMPtr<nsIMsgIncomingServer> server;
+        rv = GetServer(getter_AddRefs(server));
+        NS_ENSURE_SUCCESS(rv, NS_MSG_INVALID_OR_MISSING_SERVER);
+
+        nsCOMPtr<nsILocalMailIncomingServer> localMailServer;
+        localMailServer = do_QueryInterface(server, &rv);
+        NS_ENSURE_SUCCESS(rv, NS_MSG_INVALID_OR_MISSING_SERVER);
+
+        // first create the folders on disk (as empty files)
+        rv = localMailServer->CreateDefaultMailboxes();
+        if (NS_FAILED(rv) && rv != NS_MSG_FOLDER_EXISTS)
+          return rv;
+
+        // must happen after CreateSubFolders, or the folders won't exist.
+        rv = localMailServer->SetFlagsOnDefaultMailboxes();
+        if (NS_FAILED(rv))
+          return rv;
+      }
+    }
+    UpdateSummaryTotals(false);
+  }
+
+  return aResult ? NS_NewArrayEnumerator(aResult, mSubFolders) : NS_ERROR_NULL_POINTER;
+}
+
+nsresult nsMsgLocalMailFolder::GetDatabase()
+{
+  nsCOMPtr <nsIMsgDatabase> msgDB;
+  return GetDatabaseWOReparse(getter_AddRefs(msgDB));
+}
+
+//we treat failure as null db returned
+NS_IMETHODIMP nsMsgLocalMailFolder::GetDatabaseWOReparse(nsIMsgDatabase **aDatabase)
+{
+  NS_ENSURE_ARG(aDatabase);
+  if (m_parsingFolder)
+    return NS_MSG_ERROR_FOLDER_SUMMARY_OUT_OF_DATE;
+
+  nsresult rv = NS_OK;
+  if (!mDatabase)
+  {
+    rv = OpenDatabase();
+    if (mDatabase)
+    {
+      mDatabase->AddListener(this);
+      UpdateNewMessages();
+    }
+  }
+  NS_IF_ADDREF(*aDatabase = mDatabase);
+  if (mDatabase)
+    mDatabase->SetLastUseTime(PR_Now());
+  return rv;
+}
+
+
+// Makes sure the database is open and exists.  If the database is out of date,
+// then this call will run an async url to reparse the folder. The passed in
+// url listener will get called when the url is done.
+NS_IMETHODIMP nsMsgLocalMailFolder::GetDatabaseWithReparse(nsIUrlListener *aReparseUrlListener, nsIMsgWindow *aMsgWindow,
+                                                           nsIMsgDatabase **aMsgDatabase)
+{
+  nsresult rv = NS_OK;
+  // if we're already reparsing, just remember the listener so we can notify it
+  // when we've finished.
+  if (m_parsingFolder)
+  {
+    NS_ASSERTION(!mReparseListener, "can't have an existing listener");
+    mReparseListener = aReparseUrlListener;
+    return NS_MSG_ERROR_FOLDER_SUMMARY_OUT_OF_DATE;
+  }
+
+  if (!mDatabase)
+  {
+    nsCOMPtr <nsIFile> pathFile;
+    rv = GetFilePath(getter_AddRefs(pathFile));
+    if (NS_FAILED(rv))
+      return rv;
+
+    bool exists;
+    rv = pathFile->Exists(&exists);
+    NS_ENSURE_SUCCESS(rv,rv);
+    if (!exists)
+      return NS_ERROR_NULL_POINTER;  //mDatabase will be null at this point.
+
+    nsCOMPtr<nsIMsgDBService> msgDBService = do_GetService(NS_MSGDB_SERVICE_CONTRACTID, &rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    nsresult folderOpen = msgDBService->OpenFolderDB(this, true,
+                                                     getter_AddRefs(mDatabase));
+    if (folderOpen == NS_MSG_ERROR_FOLDER_SUMMARY_OUT_OF_DATE)
+    {
+      nsCOMPtr <nsIDBFolderInfo> dbFolderInfo;
+      nsCOMPtr <nsIDBFolderInfo> transferInfo;
+      if (mDatabase)
+      {
+        mDatabase->GetDBFolderInfo(getter_AddRefs(dbFolderInfo));
+        if (dbFolderInfo)
+        {
+          dbFolderInfo->SetNumMessages(0);
+          dbFolderInfo->SetNumUnreadMessages(0);
+          dbFolderInfo->GetTransferInfo(getter_AddRefs(transferInfo));
+        }
+        dbFolderInfo = nullptr;
+
+        // A backup message database might have been created earlier, for example
+        // if the user requested a reindex. We'll use the earlier one if we can,
+        // otherwise we'll try to backup at this point.
+        if (NS_FAILED(OpenBackupMsgDatabase()))
+        {
+          CloseAndBackupFolderDB(EmptyCString());
+          if (NS_FAILED(OpenBackupMsgDatabase()) && mBackupDatabase)
+          {
+            mBackupDatabase->RemoveListener(this);
+            mBackupDatabase = nullptr;
+          }
+        }
+        else
+          mDatabase->ForceClosed();
+
+        mDatabase = nullptr;
+      }
+      nsCOMPtr <nsIFile> summaryFile;
+      rv = GetSummaryFileLocation(pathFile, getter_AddRefs(summaryFile));
+      NS_ENSURE_SUCCESS(rv, rv);
+      // Remove summary file.
+      summaryFile->Remove(false);
+
+      // if it's out of date then reopen with upgrade.
+      rv = msgDBService->CreateNewDB(this, getter_AddRefs(mDatabase));
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      if (transferInfo && mDatabase)
+      {
+        SetDBTransferInfo(transferInfo);
+        mDatabase->SetSummaryValid(false);
+      }
+    }
+    else if (folderOpen == NS_MSG_ERROR_FOLDER_SUMMARY_MISSING)
+    {
+      rv = msgDBService->CreateNewDB(this, getter_AddRefs(mDatabase));
+    }
+
+    if (mDatabase)
+    {
+      if (mAddListener)
+        mDatabase->AddListener(this);
+
+      // if we have to regenerate the folder, run the parser url.
+      if (folderOpen == NS_MSG_ERROR_FOLDER_SUMMARY_MISSING ||
+          folderOpen == NS_MSG_ERROR_FOLDER_SUMMARY_OUT_OF_DATE)
+      {
+        if (NS_FAILED(rv = ParseFolder(aMsgWindow, aReparseUrlListener)))
+        {
+          if (rv == NS_MSG_FOLDER_BUSY)
+          {
+            mDatabase->RemoveListener(this);  //we need to null out the db so that parsing gets kicked off again.
+            mDatabase = nullptr;
+            ThrowAlertMsg("parsingFolderFailed", aMsgWindow);
+          }
+          return rv;
+        }
+
+        return NS_ERROR_NOT_INITIALIZED;
+      }
+
+      // We have a valid database so lets extract necessary info.
+      UpdateSummaryTotals(true);
+    }
+  }
+  NS_IF_ADDREF(*aMsgDatabase = mDatabase);
+  return rv;
+}
+
+NS_IMETHODIMP
+nsMsgLocalMailFolder::UpdateFolder(nsIMsgWindow *aWindow)
+{
+  (void) RefreshSizeOnDisk();
+  nsresult rv;
+
+  if (!PromptForMasterPasswordIfNecessary())
+    return NS_ERROR_FAILURE;
+
+  //If we don't currently have a database, get it.  Otherwise, the folder has been updated (presumably this
+  //changes when we download headers when opening inbox).  If it's updated, send NotifyFolderLoaded.
+  if (!mDatabase)
+  {
+    // return of NS_ERROR_NOT_INITIALIZED means running parsing URL
+    // We don't need the return value, and assigning it to mDatabase which
+    // is already set internally leaks.
+    nsCOMPtr<nsIMsgDatabase> returnedDb;
+    rv = GetDatabaseWithReparse(this, aWindow, getter_AddRefs(returnedDb));
+    if (NS_SUCCEEDED(rv))
+      NotifyFolderEvent(mFolderLoadedAtom);
+  }
+  else
+  {
+    bool valid;
+    rv = mDatabase->GetSummaryValid(&valid);
+    // don't notify folder loaded or try compaction if db isn't valid
+    // (we're probably reparsing or copying msgs to it)
+    if (NS_SUCCEEDED(rv) && valid)
+      NotifyFolderEvent(mFolderLoadedAtom);
+    else if (mCopyState)
+      mCopyState->m_notifyFolderLoaded = true; //defer folder loaded notification
+    else if (!m_parsingFolder)// if the db was already open, it's probably OK to load it if not parsing
+      NotifyFolderEvent(mFolderLoadedAtom);
+  }
+  bool filtersRun;
+  bool hasNewMessages;
+  GetHasNewMessages(&hasNewMessages);
+  if (mDatabase)
+    ApplyRetentionSettings();
+  // if we have new messages, try the filter plugins.
+  if (NS_SUCCEEDED(rv) && hasNewMessages)
+    (void) CallFilterPlugins(aWindow, &filtersRun);
+  // Callers should rely on folder loaded event to ensure completion of loading. So we'll
+  // return NS_OK even if parsing is still in progress
+  if (rv == NS_ERROR_NOT_INITIALIZED)
+    rv = NS_OK;
+  return rv;
+}
+
+NS_IMETHODIMP
+nsMsgLocalMailFolder::GetMessages(nsISimpleEnumerator **result)
+{
+  nsCOMPtr <nsIMsgDatabase> msgDB;
+  nsresult rv = GetDatabaseWOReparse(getter_AddRefs(msgDB));
+  return NS_SUCCEEDED(rv) ? msgDB->EnumerateMessages(result) : rv;
+}
+
+NS_IMETHODIMP nsMsgLocalMailFolder::GetFolderURL(nsACString& aUrl)
+{
+  nsresult rv;
+  nsCOMPtr<nsIFile> path;
+  rv = GetFilePath(getter_AddRefs(path));
+  if (NS_FAILED(rv))
+    return rv;
+
+  rv = NS_GetURLSpecFromFile(path, aUrl);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  aUrl.Replace(0, strlen("file:"), "mailbox:");
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsMsgLocalMailFolder::CreateStorageIfMissing(nsIUrlListener* aUrlListener)
+{
+  nsresult rv;
+  nsCOMPtr<nsIMsgFolder> msgParent;
+  GetParent(getter_AddRefs(msgParent));
+
+  // parent is probably not set because *this* was probably created by rdf
+  // and not by folder discovery. So, we have to compute the parent.
+  if (!msgParent)
+  {
+    nsAutoCString folderName(mURI);
+    nsAutoCString uri;
+    int32_t leafPos = folderName.RFindChar('/');
+    nsAutoCString parentName(folderName);
+    if (leafPos > 0)
+    {
+      // If there is a hierarchy, there is a parent.
+      // Don't strip off slash if it's the first character
+      parentName.SetLength(leafPos);
+      // get the corresponding RDF resource
+      // RDF will create the folder resource if it doesn't already exist
+      nsCOMPtr<nsIRDFService> rdf = do_GetService("@mozilla.org/rdf/rdf-service;1", &rv);
+      NS_ENSURE_SUCCESS(rv,rv);
+
+      nsCOMPtr<nsIRDFResource> resource;
+      rv = rdf->GetResource(parentName, getter_AddRefs(resource));
+      NS_ENSURE_SUCCESS(rv,rv);
+
+      msgParent = do_QueryInterface(resource, &rv);
+      NS_ENSURE_SUCCESS(rv,rv);
+    }
+  }
+
+  if (msgParent)
+  {
+    nsString folderName;
+    GetName(folderName);
+    rv = msgParent->CreateSubfolder(folderName, nullptr);
+    // by definition, this is OK.
+    if (rv == NS_MSG_FOLDER_EXISTS)
+      return NS_OK;
+  }
+
+  return rv;
+}
+
+NS_IMETHODIMP
+nsMsgLocalMailFolder::CreateSubfolder(const nsAString& folderName, nsIMsgWindow *msgWindow)
+{
+  nsCOMPtr<nsIMsgFolder> newFolder;
+  nsresult rv = CreateSubfolderInternal(folderName, msgWindow, getter_AddRefs(newFolder));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsIMsgFolderNotificationService> notifier(do_GetService(NS_MSGNOTIFICATIONSERVICE_CONTRACTID));
+  if (notifier)
+    notifier->NotifyFolderAdded(newFolder);
+
+  return NS_OK;
+}
+
+nsresult
+nsMsgLocalMailFolder::CreateSubfolderInternal(const nsAString& folderName,
+                                              nsIMsgWindow *msgWindow,
+                                              nsIMsgFolder **aNewFolder)
+{
+  nsresult rv = CheckIfFolderExists(folderName, this, msgWindow);
+  // No need for an assertion: we already throw an alert.
+  if (NS_FAILED(rv))
+    return rv;
+  nsCOMPtr<nsIMsgPluggableStore> msgStore;
+  rv = GetMsgStore(getter_AddRefs(msgStore));
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = msgStore->CreateFolder(this, folderName, aNewFolder);
+  if (rv == NS_MSG_ERROR_INVALID_FOLDER_NAME)
+  {
+    ThrowAlertMsg("folderCreationFailed", msgWindow);
+  }
+  else if (rv == NS_MSG_FOLDER_EXISTS)
+  {
+    ThrowAlertMsg("folderExists", msgWindow);
+  }
+
+  if (NS_SUCCEEDED(rv))
+  {
+    nsCOMPtr<nsIMsgFolder> child = *aNewFolder;
+    //we need to notify explicitly the flag change because it failed when we did AddSubfolder
+    child->OnFlagChange(mFlags);
+    child->SetPrettyName(folderName);  //because empty trash will create a new trash folder
+    NotifyItemAdded(child);
+    if (aNewFolder)
+      child.swap(*aNewFolder);
+  }
+
+  return rv;
+}
+
+NS_IMETHODIMP nsMsgLocalMailFolder::CompactAll(nsIUrlListener *aListener,
+                                               nsIMsgWindow *aMsgWindow,
+                                               bool aCompactOfflineAlso)
+{
+  nsresult rv = NS_OK;
+  nsCOMPtr<nsIMutableArray> folderArray;
+  nsCOMPtr<nsIMsgFolder> rootFolder;
+  nsCOMPtr<nsIArray> allDescendents;
+  rv = GetRootFolder(getter_AddRefs(rootFolder));
+  nsCOMPtr<nsIMsgPluggableStore> msgStore;
+  GetMsgStore(getter_AddRefs(msgStore));
+  bool storeSupportsCompaction;
+  msgStore->GetSupportsCompaction(&storeSupportsCompaction);
+  if (!storeSupportsCompaction)
+    return NotifyCompactCompleted();
+
+  if (NS_SUCCEEDED(rv) && rootFolder)
+  {
+    rv = rootFolder->GetDescendants(getter_AddRefs(allDescendents));
+    NS_ENSURE_SUCCESS(rv, rv);
+    uint32_t cnt = 0;
+    rv = allDescendents->GetLength(&cnt);
+    NS_ENSURE_SUCCESS(rv, rv);
+    folderArray = do_CreateInstance(NS_ARRAY_CONTRACTID, &rv);
+    int64_t expungedBytes = 0;
+    for (uint32_t i = 0; i < cnt; i++)
+    {
+      nsCOMPtr<nsIMsgFolder> folder = do_QueryElementAt(allDescendents, i, &rv);
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      expungedBytes = 0;
+      if (folder)
+        rv = folder->GetExpungedBytes(&expungedBytes);
+
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      if (expungedBytes > 0)
+        rv = folderArray->AppendElement(folder, false);
+    }
+    rv = folderArray->GetLength(&cnt);
+    NS_ENSURE_SUCCESS(rv,rv);
+    if (cnt == 0)
+      return NotifyCompactCompleted();
+  }
+  nsCOMPtr <nsIMsgFolderCompactor> folderCompactor =  do_CreateInstance(NS_MSGLOCALFOLDERCOMPACTOR_CONTRACTID, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+  return folderCompactor->CompactFolders(folderArray, nullptr,
+                                         aListener, aMsgWindow);
+}
+
+NS_IMETHODIMP nsMsgLocalMailFolder::Compact(nsIUrlListener *aListener, nsIMsgWindow *aMsgWindow)
+{
+  nsCOMPtr<nsIMsgPluggableStore> msgStore;
+  nsresult rv = GetMsgStore(getter_AddRefs(msgStore));
+  NS_ENSURE_SUCCESS(rv, rv);
+  bool supportsCompaction;
+  msgStore->GetSupportsCompaction(&supportsCompaction);
+  if (supportsCompaction)
+    return msgStore->CompactFolder(this, aListener, aMsgWindow);
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsMsgLocalMailFolder::EmptyTrash(nsIMsgWindow *msgWindow,
+                                               nsIUrlListener *aListener)
+{
+  nsresult rv;
+  nsCOMPtr<nsIMsgFolder> trashFolder;
+  rv = GetTrashFolder(getter_AddRefs(trashFolder));
+  if (NS_SUCCEEDED(rv))
+  {
+    uint32_t flags;
+    nsCString trashUri;
+    trashFolder->GetURI(trashUri);
+    trashFolder->GetFlags(&flags);
+    int32_t totalMessages = 0;
+    rv = trashFolder->GetTotalMessages(true, &totalMessages);
+    if (totalMessages <= 0)
+    {
+      nsCOMPtr<nsISimpleEnumerator> enumerator;
+      rv = trashFolder->GetSubFolders(getter_AddRefs(enumerator));
+      NS_ENSURE_SUCCESS(rv,rv);
+      // Any folders to deal with?
+      bool hasMore;
+      rv = enumerator->HasMoreElements(&hasMore);
+      if (NS_FAILED(rv) || !hasMore)
+        return NS_OK;
+    }
+    nsCOMPtr<nsIMsgFolder> parentFolder;
+    rv = trashFolder->GetParent(getter_AddRefs(parentFolder));
+    if (NS_SUCCEEDED(rv) && parentFolder)
+    {
+      nsCOMPtr <nsIDBFolderInfo> transferInfo;
+      trashFolder->GetDBTransferInfo(getter_AddRefs(transferInfo));
+      trashFolder->SetParent(nullptr);
+      parentFolder->PropagateDelete(trashFolder, true, msgWindow);
+      parentFolder->CreateSubfolder(NS_LITERAL_STRING("Trash"), nullptr);
+      nsCOMPtr<nsIMsgFolder> newTrashFolder;
+      rv = GetTrashFolder(getter_AddRefs(newTrashFolder));
+      if (NS_SUCCEEDED(rv) && newTrashFolder)
+      {
+        nsCOMPtr <nsIMsgLocalMailFolder> localTrash = do_QueryInterface(newTrashFolder);
+        newTrashFolder->SetDBTransferInfo(transferInfo);
+        if (localTrash)
+          localTrash->RefreshSizeOnDisk();
+        // update the summary totals so the front end will
+        // show the right thing for the new trash folder
+        // see bug #161999
+        nsCOMPtr<nsIDBFolderInfo> dbFolderInfo;
+        nsCOMPtr<nsIMsgDatabase> db;
+        newTrashFolder->GetDBFolderInfoAndDB(getter_AddRefs(dbFolderInfo), getter_AddRefs(db));
+        if (dbFolderInfo)
+        {
+          dbFolderInfo->SetNumUnreadMessages(0);
+          dbFolderInfo->SetNumMessages(0);
+        }
+        newTrashFolder->UpdateSummaryTotals(true);
+      }
+    }
+  }
+  return rv;
+}
+
+nsresult nsMsgLocalMailFolder::IsChildOfTrash(bool *result)
+{
+  NS_ENSURE_ARG_POINTER(result);
+  uint32_t parentFlags = 0;
+  *result = false;
+  bool isServer;
+  nsresult rv = GetIsServer(&isServer);
+  if (NS_FAILED(rv) || isServer)
+    return NS_OK;
+
+  rv= GetFlags(&parentFlags);  //this is the parent folder
+  if (parentFlags & nsMsgFolderFlags::Trash)
+  {
+    *result = true;
+    return rv;
+  }
+
+  nsCOMPtr<nsIMsgFolder> parentFolder;
+  nsCOMPtr<nsIMsgFolder> thisFolder;
+  rv = QueryInterface(NS_GET_IID(nsIMsgFolder), (void **) getter_AddRefs(thisFolder));
+
+  while (!isServer)
+  {
+    thisFolder->GetParent(getter_AddRefs(parentFolder));
+    if (!parentFolder)
+      return NS_OK;
+
+    rv = parentFolder->GetIsServer(&isServer);
+    if (NS_FAILED(rv) || isServer)
+      return NS_OK;
+
+    rv = parentFolder->GetFlags(&parentFlags);
+    if (NS_FAILED(rv))
+      return NS_OK;
+
+    if (parentFlags & nsMsgFolderFlags::Trash)
+    {
+      *result = true;
+      return rv;
+    }
+
+    thisFolder = parentFolder;
+  }
+  return rv;
+}
+
+NS_IMETHODIMP nsMsgLocalMailFolder::Delete()
+{
+  nsresult rv;
+  nsCOMPtr<nsIMsgDBService> msgDBService = do_GetService(NS_MSGDB_SERVICE_CONTRACTID, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+  msgDBService->CachedDBForFolder(this, getter_AddRefs(mDatabase));
+  if (mDatabase)
+  {
+    mDatabase->ForceClosed();
+    mDatabase = nullptr;
+  }
+
+  nsCOMPtr<nsIMsgIncomingServer> server;
+  rv = GetServer(getter_AddRefs(server));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsIMsgPluggableStore> msgStore;
+
+  rv = server->GetMsgStore(getter_AddRefs(msgStore));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr <nsIFile> summaryFile;
+  rv = GetSummaryFile(getter_AddRefs(summaryFile));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  //Clean up .sbd folder if it exists.
+  // Remove summary file.
+  rv = summaryFile->Remove(false);
+  NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "Could not delete msg summary file");
+
+  rv = msgStore->DeleteFolder(this);
+  if (rv == NS_ERROR_FILE_NOT_FOUND ||
+      rv == NS_ERROR_FILE_TARGET_DOES_NOT_EXIST)
+    rv = NS_OK; // virtual folders do not have a msgStore file
+  return rv;
+}
+
+NS_IMETHODIMP nsMsgLocalMailFolder::DeleteSubFolders(nsIArray *folders, nsIMsgWindow *msgWindow)
+{
+  nsresult rv;
+  bool isChildOfTrash;
+  IsChildOfTrash(&isChildOfTrash);
+
+  // we don't allow multiple folder selection so this is ok.
+  nsCOMPtr<nsIMsgFolder> folder = do_QueryElementAt(folders, 0);
+  uint32_t folderFlags = 0;
+  if (folder)
+    folder->GetFlags(&folderFlags);
+  // when deleting from trash, or virtual folder, just delete it.
+  if (isChildOfTrash || folderFlags & nsMsgFolderFlags::Virtual)
+    return nsMsgDBFolder::DeleteSubFolders(folders, msgWindow);
+
+  nsCOMPtr<nsIMsgFolder> trashFolder;
+  rv = GetTrashFolder(getter_AddRefs(trashFolder));
+  if (NS_SUCCEEDED(rv))
+  {
+    if (folder)
+    {
+      nsCOMPtr<nsIMsgCopyService> copyService(do_GetService(NS_MSGCOPYSERVICE_CONTRACTID, &rv));
+      NS_ENSURE_SUCCESS(rv, rv);
+      rv = copyService->CopyFolders(folders, trashFolder, true, nullptr, msgWindow);
+    }
+  }
+  return rv;
+}
+
+nsresult nsMsgLocalMailFolder::ConfirmFolderDeletion(nsIMsgWindow *aMsgWindow,
+                                                     nsIMsgFolder *aFolder, bool *aResult)
+{
+  NS_ENSURE_ARG(aResult);
+  NS_ENSURE_ARG(aMsgWindow);
+  NS_ENSURE_ARG(aFolder);
+  nsCOMPtr<nsIDocShell> docShell;
+  aMsgWindow->GetRootDocShell(getter_AddRefs(docShell));
+  if (docShell)
+  {
+    bool confirmDeletion = true;
+    nsresult rv;
+    nsCOMPtr<nsIPrefBranch> pPrefBranch(do_GetService(NS_PREFSERVICE_CONTRACTID, &rv));
+    NS_ENSURE_SUCCESS(rv, rv);
+    pPrefBranch->GetBoolPref("mailnews.confirm.moveFoldersToTrash", &confirmDeletion);
+    if (confirmDeletion)
+    {
+      nsCOMPtr<nsIStringBundleService> bundleService =
+        mozilla::services::GetStringBundleService();
+      NS_ENSURE_TRUE(bundleService, NS_ERROR_UNEXPECTED);
+      nsCOMPtr<nsIStringBundle> bundle;
+      rv = bundleService->CreateBundle("chrome://messenger/locale/localMsgs.properties", getter_AddRefs(bundle));
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      nsAutoString folderName;
+      rv = aFolder->GetName(folderName);
+      NS_ENSURE_SUCCESS(rv, rv);
+      const char16_t *formatStrings[1] = { folderName.get() };
+
+      nsAutoString deleteFolderDialogTitle;
+      rv = bundle->GetStringFromName(
+        u"pop3DeleteFolderDialogTitle",
+        getter_Copies(deleteFolderDialogTitle));
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      nsAutoString deleteFolderButtonLabel;
+      rv = bundle->GetStringFromName(
+        u"pop3DeleteFolderButtonLabel",
+        getter_Copies(deleteFolderButtonLabel));
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      nsAutoString confirmationStr;
+      rv = bundle->FormatStringFromName(
+        u"pop3MoveFolderToTrash", formatStrings, 1,
+        getter_Copies(confirmationStr));
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      nsCOMPtr<nsIPrompt> dialog(do_GetInterface(docShell));
+      if (dialog)
+      {
+        int32_t buttonPressed = 0;
+        // Default the dialog to "cancel".
+        const uint32_t buttonFlags =
+          (nsIPrompt::BUTTON_TITLE_IS_STRING * nsIPrompt::BUTTON_POS_0) +
+          (nsIPrompt::BUTTON_TITLE_CANCEL * nsIPrompt::BUTTON_POS_1);
+        bool dummyValue = false;
+        rv = dialog->ConfirmEx(deleteFolderDialogTitle.get(), confirmationStr.get(),
+                               buttonFlags,  deleteFolderButtonLabel.get(),
+                               nullptr, nullptr, nullptr, &dummyValue,
+                               &buttonPressed);
+        NS_ENSURE_SUCCESS(rv, rv);
+        *aResult = !buttonPressed; // "ok" is in position 0
+      }
+    }
+    else
+      *aResult = true;
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsMsgLocalMailFolder::Rename(const nsAString& aNewName, nsIMsgWindow *msgWindow)
+{
+  // Renaming to the same name is easy
+  if (mName.Equals(aNewName))
+    return NS_OK;
+
+  nsCOMPtr<nsIMsgFolder> parentFolder;
+  nsresult rv = GetParent(getter_AddRefs(parentFolder));
+  if (!parentFolder)
+    return NS_ERROR_NULL_POINTER;
+
+  rv = CheckIfFolderExists(aNewName, parentFolder, msgWindow);
+  if (NS_FAILED(rv))
+    return rv;
+
+  nsCOMPtr<nsIMsgPluggableStore> msgStore;
+  nsCOMPtr<nsIMsgFolder> newFolder;
+  rv = GetMsgStore(getter_AddRefs(msgStore));
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = msgStore->RenameFolder(this, aNewName, getter_AddRefs(newFolder));
+  if (NS_FAILED(rv))
+  {
+    if (msgWindow)
+      (void) ThrowAlertMsg((rv == NS_MSG_FOLDER_EXISTS) ?
+                            "folderExists" : "folderRenameFailed", msgWindow);
+    return rv;
+  }
+
+  int32_t count = mSubFolders.Count();
+    if (newFolder)
+    {
+      // Because we just renamed the db, w/o setting the pretty name in it,
+      // we need to force the pretty name to be correct.
+      // SetPrettyName won't write the name to the db if it doesn't think the
+      // name has changed. This hack forces the pretty name to get set in the db.
+      // We could set the new pretty name on the db before renaming the .msf file,
+      // but if the rename failed, it would be out of sync.
+      newFolder->SetPrettyName(EmptyString());
+      newFolder->SetPrettyName(aNewName);
+      bool changed = false;
+      MatchOrChangeFilterDestination(newFolder, true /*caseInsenstive*/, &changed);
+      if (changed)
+        AlertFilterChanged(msgWindow);
+
+      if (count > 0)
+        newFolder->RenameSubFolders(msgWindow, this);
+
+      // Discover the subfolders inside this folder (this is recursive)
+      nsCOMPtr<nsISimpleEnumerator> dummy;
+      newFolder->GetSubFolders(getter_AddRefs(dummy));
+
+      // the newFolder should have the same flags
+      newFolder->SetFlags(mFlags);
+      if (parentFolder)
+      {
+        SetParent(nullptr);
+        parentFolder->PropagateDelete(this, false, msgWindow);
+        parentFolder->NotifyItemAdded(newFolder);
+      }
+      SetFilePath(nullptr); // forget our path, since this folder object renamed itself
+      nsCOMPtr<nsIAtom> folderRenameAtom = MsgGetAtom("RenameCompleted");
+      newFolder->NotifyFolderEvent(folderRenameAtom);
+
+      nsCOMPtr<nsIMsgFolderNotificationService> notifier(do_GetService(NS_MSGNOTIFICATIONSERVICE_CONTRACTID));
+      if (notifier)
+        notifier->NotifyFolderRenamed(this, newFolder);
+    }
+  return rv;
+}
+
+NS_IMETHODIMP nsMsgLocalMailFolder::RenameSubFolders(nsIMsgWindow *msgWindow, nsIMsgFolder *oldFolder)
+{
+  nsresult rv =NS_OK;
+  mInitialized = true;
+
+  uint32_t flags;
+  oldFolder->GetFlags(&flags);
+  SetFlags(flags);
+
+  nsCOMPtr<nsISimpleEnumerator> enumerator;
+  rv = oldFolder->GetSubFolders(getter_AddRefs(enumerator));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  bool hasMore;
+  while (NS_SUCCEEDED(enumerator->HasMoreElements(&hasMore)) && hasMore)
+  {
+    nsCOMPtr<nsISupports> item;
+    enumerator->GetNext(getter_AddRefs(item));
+
+    nsCOMPtr<nsIMsgFolder> msgFolder(do_QueryInterface(item));
+    if (!msgFolder)
+      continue;
+
+    nsString folderName;
+    rv = msgFolder->GetName(folderName);
+    nsCOMPtr <nsIMsgFolder> newFolder;
+    AddSubfolder(folderName, getter_AddRefs(newFolder));
+    if (newFolder)
+    {
+      newFolder->SetPrettyName(folderName);
+      bool changed = false;
+      msgFolder->MatchOrChangeFilterDestination(newFolder, true /*caseInsenstive*/, &changed);
+      if (changed)
+        msgFolder->AlertFilterChanged(msgWindow);
+      newFolder->RenameSubFolders(msgWindow, msgFolder);
+    }
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsMsgLocalMailFolder::GetPrettyName(nsAString& prettyName)
+{
+  return nsMsgDBFolder::GetPrettyName(prettyName);
+}
+
+NS_IMETHODIMP nsMsgLocalMailFolder::SetPrettyName(const nsAString& aName)
+{
+  nsresult rv = nsMsgDBFolder::SetPrettyName(aName);
+  NS_ENSURE_SUCCESS(rv, rv);
+  nsCString folderName;
+  rv = GetStringProperty("folderName", folderName);
+  NS_ConvertUTF16toUTF8 utf8FolderName(mName);
+  return NS_FAILED(rv) || !folderName.Equals(utf8FolderName) ? SetStringProperty("folderName", utf8FolderName) : rv;
+}
+
+NS_IMETHODIMP nsMsgLocalMailFolder::GetName(nsAString& aName)
+{
+  ReadDBFolderInfo(false);
+  return nsMsgDBFolder::GetName(aName);
+}
+
+nsresult nsMsgLocalMailFolder::OpenDatabase()
+{
+  nsresult rv;
+  nsCOMPtr<nsIMsgDBService> msgDBService = do_GetService(NS_MSGDB_SERVICE_CONTRACTID, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr <nsIFile> file;
+  rv = GetFilePath(getter_AddRefs(file));
+
+  rv = msgDBService->OpenFolderDB(this, true, getter_AddRefs(mDatabase));
+    if (rv == NS_MSG_ERROR_FOLDER_SUMMARY_MISSING)
+    {
+    // check if we're a real folder by looking at the parent folder.
+    nsCOMPtr<nsIMsgFolder> parent;
+    GetParent(getter_AddRefs(parent));
+    if (parent)
+    {
+      // This little dance creates an empty .msf file and then checks
+      // if the db is valid - this works if the folder is empty, which
+      // we don't have a direct way of checking.
+      nsCOMPtr<nsIMsgDatabase> db;
+      rv = msgDBService->CreateNewDB(this, getter_AddRefs(db));
+      if (db)
+      {
+        UpdateSummaryTotals(true);
+        db->Close(true);
+        mDatabase = nullptr;
+        db = nullptr;
+        rv = msgDBService->OpenFolderDB(this, false,
+                                        getter_AddRefs(mDatabase));
+        if (NS_FAILED(rv))
+          mDatabase = nullptr;
+      }
+    }
+  }
+  else if (NS_FAILED(rv))
+    mDatabase = nullptr;
+
+  return rv;
+}
+
+NS_IMETHODIMP
+nsMsgLocalMailFolder::GetDBFolderInfoAndDB(nsIDBFolderInfo **folderInfo, nsIMsgDatabase **db)
+{
+  if (!db || !folderInfo || !mPath || mIsServer)
+    return NS_ERROR_NULL_POINTER;   //ducarroz: should we use NS_ERROR_INVALID_ARG?
+
+  nsresult rv;
+  if (mDatabase)
+    rv = NS_OK;
+  else
+  {
+    rv = OpenDatabase();
+
+    if (mAddListener && mDatabase)
+      mDatabase->AddListener(this);
+  }
+
+  NS_IF_ADDREF(*db = mDatabase);
+  if (NS_SUCCEEDED(rv) && *db)
+    rv = (*db)->GetDBFolderInfo(folderInfo);
+  return rv;
+}
+
+NS_IMETHODIMP nsMsgLocalMailFolder::ReadFromFolderCacheElem(nsIMsgFolderCacheElement *element)
+{
+  NS_ENSURE_ARG_POINTER(element);
+  nsresult rv = nsMsgDBFolder::ReadFromFolderCacheElem(element);
+  NS_ENSURE_SUCCESS(rv, rv);
+  nsCString utf8Name;
+  rv = element->GetStringProperty("folderName", utf8Name);
+  NS_ENSURE_SUCCESS(rv, rv);
+  CopyUTF8toUTF16(utf8Name, mName);
+  return rv;
+}
+
+NS_IMETHODIMP nsMsgLocalMailFolder::WriteToFolderCacheElem(nsIMsgFolderCacheElement *element)
+{
+  NS_ENSURE_ARG_POINTER(element);
+  nsMsgDBFolder::WriteToFolderCacheElem(element);
+  return element->SetStringProperty("folderName", NS_ConvertUTF16toUTF8(mName));
+}
+
+NS_IMETHODIMP nsMsgLocalMailFolder::GetDeletable(bool *deletable)
+{
+  NS_ENSURE_ARG_POINTER(deletable);
+
+  bool isServer;
+  GetIsServer(&isServer);
+  *deletable = !(isServer || (mFlags & nsMsgFolderFlags::SpecialUse));
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsMsgLocalMailFolder::RefreshSizeOnDisk()
+{
+  int64_t oldFolderSize = mFolderSize;
+  // we set this to unknown to force it to get recalculated from disk
+  mFolderSize = kSizeUnknown;
+  if (NS_SUCCEEDED(GetSizeOnDisk(&mFolderSize)))
+    NotifyIntPropertyChanged(kFolderSizeAtom, oldFolderSize, mFolderSize);
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsMsgLocalMailFolder::GetSizeOnDisk(int64_t *aSize)
+{
+  NS_ENSURE_ARG_POINTER(aSize);
+
+  bool isServer = false;
+  nsresult rv = GetIsServer(&isServer);
+  // If this is the rootFolder, return 0 as a safe value.
+  if (NS_FAILED(rv) || isServer)
+    mFolderSize = 0;
+
+  if (mFolderSize == kSizeUnknown)
+  {
+    nsCOMPtr<nsIFile> file;
+    rv = GetFilePath(getter_AddRefs(file));
+    NS_ENSURE_SUCCESS(rv, rv);
+    // Use a temporary variable so that we keep mFolderSize on kSizeUnknown
+    // if GetFileSize() fails.
+    int64_t folderSize;
+    rv = file->GetFileSize(&folderSize);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    mFolderSize = folderSize;
+  }
+  *aSize = mFolderSize;
+  return NS_OK;
+}
+
+nsresult
+nsMsgLocalMailFolder::GetTrashFolder(nsIMsgFolder** result)
+{
+  NS_ENSURE_ARG_POINTER(result);
+  nsresult rv;
+  nsCOMPtr<nsIMsgFolder> rootFolder;
+  rv = GetRootFolder(getter_AddRefs(rootFolder));
+  if (NS_SUCCEEDED(rv))
+  {
+    rootFolder->GetFolderWithFlags(nsMsgFolderFlags::Trash, result);
+    if (!*result)
+      rv = NS_ERROR_FAILURE;
+  }
+  return rv;
+}
+
+NS_IMETHODIMP
+nsMsgLocalMailFolder::DeleteMessages(nsIArray *messages,
+                                     nsIMsgWindow *msgWindow,
+                                     bool deleteStorage, bool isMove,
+                                     nsIMsgCopyServiceListener* listener, bool allowUndo)
+{
+  NS_ENSURE_ARG_POINTER(messages);
+
+  uint32_t messageCount;
+  nsresult rv = messages->GetLength(&messageCount);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // shift delete case - (delete to trash is handled in EndMove)
+  // this is also the case when applying retention settings.
+  if (deleteStorage && !isMove)
+  {
+    MarkMsgsOnPop3Server(messages, POP3_DELETE);
+  }
+
+  bool isTrashFolder = mFlags & nsMsgFolderFlags::Trash;
+
+  // notify on delete from trash and shift-delete
+  if (!isMove && (deleteStorage || isTrashFolder))
+  {
+    nsCOMPtr<nsIMsgFolderNotificationService> notifier(do_GetService(NS_MSGNOTIFICATIONSERVICE_CONTRACTID));
+    if (notifier)
+        notifier->NotifyMsgsDeleted(messages);
+  }
+
+  if (!deleteStorage && !isTrashFolder)
+  {
+    nsCOMPtr<nsIMsgFolder> trashFolder;
+    rv = GetTrashFolder(getter_AddRefs(trashFolder));
+    if (NS_SUCCEEDED(rv))
+    {
+      nsCOMPtr<nsIMsgCopyService> copyService = do_GetService(NS_MSGCOPYSERVICE_CONTRACTID, &rv);
+      NS_ENSURE_SUCCESS(rv, rv);
+      return copyService->CopyMessages(this, messages, trashFolder,
+                                       true, listener, msgWindow, allowUndo);
+    }
+  }
+  else
+  {
+    nsCOMPtr <nsIMsgDatabase> msgDB;
+    rv = GetDatabaseWOReparse(getter_AddRefs(msgDB));
+    if (NS_SUCCEEDED(rv))
+    {
+      if (deleteStorage && isMove && GetDeleteFromServerOnMove())
+        MarkMsgsOnPop3Server(messages, POP3_DELETE);
+
+      nsCOMPtr<nsISupports> msgSupport;
+      rv = EnableNotifications(allMessageCountNotifications, false, true /*dbBatching*/);
+      if (NS_SUCCEEDED(rv))
+      {
+        nsCOMPtr<nsIMsgPluggableStore> msgStore;
+        rv = GetMsgStore(getter_AddRefs(msgStore));
+        if (NS_SUCCEEDED(rv))
+        {
+          rv = msgStore->DeleteMessages(messages);
+          nsCOMPtr<nsIMsgDBHdr> msgDBHdr;
+          for (uint32_t i = 0; i < messageCount; ++i)
+          {
+            msgDBHdr = do_QueryElementAt(messages, i, &rv);
+            rv = msgDB->DeleteHeader(msgDBHdr, nullptr, false, true);
+          }
+        }
+      }
+      else if (rv == NS_MSG_FOLDER_BUSY)
+        ThrowAlertMsg("deletingMsgsFailed", msgWindow);
+
+      // we are the source folder here for a move or shift delete
+      //enable notifications because that will close the file stream
+      // we've been caching, mark the db as valid, and commit it.
+      EnableNotifications(allMessageCountNotifications, true, true /*dbBatching*/);
+      if (!isMove)
+        NotifyFolderEvent(NS_SUCCEEDED(rv) ? mDeleteOrMoveMsgCompletedAtom : mDeleteOrMoveMsgFailedAtom);
+      if (msgWindow && !isMove)
+        AutoCompact(msgWindow);
+    }
+  }
+
+  if (msgWindow && !isMove && (deleteStorage || isTrashFolder)) {
+    // Clear undo and redo stack.
+    nsCOMPtr<nsITransactionManager> txnMgr;
+    msgWindow->GetTransactionManager(getter_AddRefs(txnMgr));
+    if (txnMgr) {
+      txnMgr->Clear();
+    }
+  }
+  return rv;
+}
+
+NS_IMETHODIMP
+nsMsgLocalMailFolder::AddMessageDispositionState(nsIMsgDBHdr *aMessage, nsMsgDispositionState aDispositionFlag)
+{
+  nsMsgMessageFlagType msgFlag = 0;
+  switch (aDispositionFlag) {
+    case nsIMsgFolder::nsMsgDispositionState_Replied:
+      msgFlag = nsMsgMessageFlags::Replied;
+      break;
+    case nsIMsgFolder::nsMsgDispositionState_Forwarded:
+      msgFlag = nsMsgMessageFlags::Forwarded;
+      break;
+    default:
+      return NS_ERROR_UNEXPECTED;
+  }
+
+  nsresult rv = nsMsgDBFolder::AddMessageDispositionState(aMessage, aDispositionFlag);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsIMsgPluggableStore> msgStore;
+  rv = GetMsgStore(getter_AddRefs(msgStore));
+  NS_ENSURE_SUCCESS(rv, rv);
+  nsCOMPtr<nsIMutableArray> messages(do_CreateInstance(NS_ARRAY_CONTRACTID, &rv));
+  NS_ENSURE_SUCCESS(rv, rv);
+  messages->AppendElement(aMessage, false);
+  return msgStore->ChangeFlags(messages, msgFlag, true);
+}
+
+NS_IMETHODIMP
+nsMsgLocalMailFolder::MarkMessagesRead(nsIArray *aMessages, bool aMarkRead)
+{
+  nsresult rv = nsMsgDBFolder::MarkMessagesRead(aMessages, aMarkRead);
+  NS_ENSURE_SUCCESS(rv, rv);
+  nsCOMPtr<nsIMsgPluggableStore> msgStore;
+  rv = GetMsgStore(getter_AddRefs(msgStore));
+  NS_ENSURE_SUCCESS(rv, rv);
+  return msgStore->ChangeFlags(aMessages, nsMsgMessageFlags::Read, aMarkRead);
+}
+
+NS_IMETHODIMP
+nsMsgLocalMailFolder::MarkMessagesFlagged(nsIArray *aMessages,
+                                          bool aMarkFlagged)
+{
+  nsresult rv = nsMsgDBFolder::MarkMessagesFlagged(aMessages, aMarkFlagged);
+  NS_ENSURE_SUCCESS(rv, rv);
+  nsCOMPtr<nsIMsgPluggableStore> msgStore;
+  rv = GetMsgStore(getter_AddRefs(msgStore));
+  NS_ENSURE_SUCCESS(rv, rv);
+  return msgStore->ChangeFlags(aMessages, nsMsgMessageFlags::Marked,
+                               aMarkFlagged);
+}
+
+NS_IMETHODIMP
+nsMsgLocalMailFolder::MarkAllMessagesRead(nsIMsgWindow *aMsgWindow)
+{
+  nsresult rv = GetDatabase();
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsMsgKey *thoseMarked = nullptr;
+  uint32_t numMarked = 0;
+  EnableNotifications(allMessageCountNotifications, false, true /*dbBatching*/);
+  rv = mDatabase->MarkAllRead(&numMarked, &thoseMarked);
+  EnableNotifications(allMessageCountNotifications, true, true /*dbBatching*/);
+  if (NS_FAILED(rv) || !numMarked || !thoseMarked)
+    return rv;
+
+  do {
+    nsCOMPtr<nsIMutableArray> messages;
+    rv = MsgGetHdrsFromKeys(mDatabase, thoseMarked, numMarked, getter_AddRefs(messages));
+    if (NS_FAILED(rv))
+      break;
+
+    nsCOMPtr<nsIMsgPluggableStore> msgStore;
+    rv = GetMsgStore(getter_AddRefs(msgStore));
+    if (NS_FAILED(rv))
+      break;
+
+    rv = msgStore->ChangeFlags(messages, nsMsgMessageFlags::Read, true);
+    if (NS_FAILED(rv))
+      break;
+
+    mDatabase->Commit(nsMsgDBCommitType::kLargeCommit);
+
+    // Setup a undo-state
+    if (aMsgWindow)
+      rv = AddMarkAllReadUndoAction(aMsgWindow, thoseMarked, numMarked);
+  } while (false);
+
+  free(thoseMarked);
+  return rv;
+}
+
+NS_IMETHODIMP nsMsgLocalMailFolder::MarkThreadRead(nsIMsgThread *thread)
+{
+  nsresult rv = GetDatabase();
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsMsgKey *thoseMarked = nullptr;
+  uint32_t numMarked = 0;
+  rv = mDatabase->MarkThreadRead(thread, nullptr, &numMarked, &thoseMarked);
+  if (NS_FAILED(rv) || !numMarked || !thoseMarked)
+    return rv;
+
+  do {
+    nsCOMPtr<nsIMutableArray> messages;
+    rv = MsgGetHdrsFromKeys(mDatabase, thoseMarked, numMarked, getter_AddRefs(messages));
+    if (NS_FAILED(rv))
+      break;
+
+    nsCOMPtr<nsIMsgPluggableStore> msgStore;
+    rv = GetMsgStore(getter_AddRefs(msgStore));
+    if (NS_FAILED(rv))
+      break;
+
+    rv = msgStore->ChangeFlags(messages, nsMsgMessageFlags::Read, true);
+    if (NS_FAILED(rv))
+      break;
+
+    mDatabase->Commit(nsMsgDBCommitType::kLargeCommit);
+  } while (false);
+
+  free(thoseMarked);
+  return rv;
+}
+
+nsresult
+nsMsgLocalMailFolder::InitCopyState(nsISupports* aSupport,
+                                    nsIArray* messages,
+                                    bool isMove,
+                                    nsIMsgCopyServiceListener* listener,
+                                    nsIMsgWindow *msgWindow, bool isFolder,
+                                    bool allowUndo)
+{
+  nsCOMPtr<nsIFile> path;
+
+  NS_ASSERTION(!mCopyState, "already copying a msg into this folder");
+  if (mCopyState)
+    return NS_ERROR_FAILURE; // already has a  copy in progress
+
+  // get mDatabase set, so we can use it to add new hdrs to this db.
+  // calling GetDatabase will set mDatabase - we use the comptr
+  // here to avoid doubling the refcnt on mDatabase. We don't care if this
+  // fails - we just want to give it a chance. It will definitely fail in
+  // nsLocalMailFolder::EndCopy because we will have written data to the folder
+  // and changed its size.
+  nsCOMPtr <nsIMsgDatabase> msgDB;
+  GetDatabaseWOReparse(getter_AddRefs(msgDB));
+  bool isLocked;
+
+  GetLocked(&isLocked);
+  if (isLocked)
+    return NS_MSG_FOLDER_BUSY;
+
+  AcquireSemaphore(static_cast<nsIMsgLocalMailFolder*>(this));
+
+  mCopyState = new nsLocalMailCopyState();
+  NS_ENSURE_TRUE(mCopyState, NS_ERROR_OUT_OF_MEMORY);
+
+  mCopyState->m_dataBuffer = (char*) PR_CALLOC(COPY_BUFFER_SIZE+1);
+  NS_ENSURE_TRUE(mCopyState->m_dataBuffer, NS_ERROR_OUT_OF_MEMORY);
+
+  mCopyState->m_dataBufferSize = COPY_BUFFER_SIZE;
+  mCopyState->m_destDB = msgDB;
+
+  //Before we continue we should verify that there is enough diskspace.
+  //XXX How do we do this?
+  nsresult rv;
+  mCopyState->m_srcSupport = do_QueryInterface(aSupport, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+  mCopyState->m_messages = messages;
+  mCopyState->m_curCopyIndex = 0;
+  mCopyState->m_isMove = isMove;
+  mCopyState->m_isFolder = isFolder;
+  mCopyState->m_allowUndo = allowUndo;
+  mCopyState->m_msgWindow = msgWindow;
+  rv = messages->GetLength(&mCopyState->m_totalMsgCount);
+  if (listener)
+    mCopyState->m_listener = do_QueryInterface(listener, &rv);
+  mCopyState->m_copyingMultipleMessages = false;
+  mCopyState->m_wholeMsgInStream = false;
+
+  // If we have source messages then we need destination messages too.
+  if (messages)
+    mCopyState->m_destMessages = do_CreateInstance(NS_ARRAY_CONTRACTID);
+
+  return rv;
+}
+
+NS_IMETHODIMP nsMsgLocalMailFolder::OnAnnouncerGoingAway(nsIDBChangeAnnouncer *instigator)
+{
+  if (mCopyState)
+    mCopyState->m_destDB = nullptr;
+  return nsMsgDBFolder::OnAnnouncerGoingAway(instigator);
+}
+
+NS_IMETHODIMP
+nsMsgLocalMailFolder::OnCopyCompleted(nsISupports *srcSupport, bool moveCopySucceeded)
+{
+  if (mCopyState && mCopyState->m_notifyFolderLoaded)
+    NotifyFolderEvent(mFolderLoadedAtom);
+
+  (void) RefreshSizeOnDisk();
+  // we are the destination folder for a move/copy
+  bool haveSemaphore;
+  nsresult rv = TestSemaphore(static_cast<nsIMsgLocalMailFolder*>(this), &haveSemaphore);
+  if (NS_SUCCEEDED(rv) && haveSemaphore)
+    ReleaseSemaphore(static_cast<nsIMsgLocalMailFolder*>(this));
+
+  if (mCopyState && !mCopyState->m_newMsgKeywords.IsEmpty() &&
+      mCopyState->m_newHdr)
+  {
+    nsCOMPtr<nsIMutableArray> messageArray(do_CreateInstance(NS_ARRAY_CONTRACTID, &rv));
+    NS_ENSURE_TRUE(messageArray, rv);
+    messageArray->AppendElement(mCopyState->m_newHdr, false);
+    AddKeywordsToMessages(messageArray, mCopyState->m_newMsgKeywords);
+  }
+  if (moveCopySucceeded && mDatabase)
+  {
+    mDatabase->SetSummaryValid(true);
+    (void) CloseDBIfFolderNotOpen();
+  }
+
+  delete mCopyState;
+  mCopyState = nullptr;
+  nsCOMPtr<nsIMsgCopyService> copyService = do_GetService(NS_MSGCOPYSERVICE_CONTRACTID, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+  return copyService->NotifyCompletion(srcSupport, this, moveCopySucceeded ? NS_OK : NS_ERROR_FAILURE);
+}
+
+bool nsMsgLocalMailFolder::CheckIfSpaceForCopy(nsIMsgWindow *msgWindow,
+                                                 nsIMsgFolder *srcFolder,
+                                                 nsISupports *srcSupports,
+                                                 bool isMove,
+                                                 int64_t totalMsgSize)
+{
+  bool spaceNotAvailable = true;
+  nsresult rv = WarnIfLocalFileTooBig(msgWindow, totalMsgSize, &spaceNotAvailable);
+  if (NS_FAILED(rv) || spaceNotAvailable)
+  {
+    if (isMove && srcFolder)
+      srcFolder->NotifyFolderEvent(mDeleteOrMoveMsgFailedAtom);
+    OnCopyCompleted(srcSupports, false);
+    return false;
+  }
+  return true;
+}
+
+NS_IMETHODIMP
+nsMsgLocalMailFolder::CopyMessages(nsIMsgFolder* srcFolder, nsIArray*
+                                   messages, bool isMove,
+                                   nsIMsgWindow *msgWindow,
+                                   nsIMsgCopyServiceListener* listener,
+                                   bool isFolder, bool allowUndo)
+{
+  nsCOMPtr<nsISupports> srcSupport = do_QueryInterface(srcFolder);
+  bool isServer;
+  nsresult rv = GetIsServer(&isServer);
+  if (NS_SUCCEEDED(rv) && isServer)
+  {
+    NS_ERROR("Destination is the root folder. Cannot move/copy here");
+    if (isMove)
+      srcFolder->NotifyFolderEvent(mDeleteOrMoveMsgFailedAtom);
+    return OnCopyCompleted(srcSupport, false);
+  }
+
+  UpdateTimestamps(allowUndo);
+  nsCString protocolType;
+  rv = srcFolder->GetURI(protocolType);
+  protocolType.SetLength(protocolType.FindChar(':'));
+
+  bool needOfflineBody = (WeAreOffline() &&
+    (MsgLowerCaseEqualsLiteral(protocolType, "imap") ||
+     MsgLowerCaseEqualsLiteral(protocolType, "news")));
+  int64_t totalMsgSize = 0;
+  uint32_t numMessages = 0;
+  messages->GetLength(&numMessages);
+  for (uint32_t i = 0; i < numMessages; i++)
+  {
+    nsCOMPtr<nsIMsgDBHdr> message(do_QueryElementAt(messages, i, &rv));
+    if (NS_SUCCEEDED(rv) && message)
+    {
+      nsMsgKey key;
+      uint32_t msgSize;
+      message->GetMessageSize(&msgSize);
+
+      /* 200 is a per-message overhead to account for any extra data added
+         to the message.
+      */
+      totalMsgSize += msgSize + 200;
+
+      if (needOfflineBody)
+      {
+        bool hasMsgOffline = false;
+        message->GetMessageKey(&key);
+        srcFolder->HasMsgOffline(key, &hasMsgOffline);
+        if (!hasMsgOffline)
+        {
+          if (isMove)
+            srcFolder->NotifyFolderEvent(mDeleteOrMoveMsgFailedAtom);
+          ThrowAlertMsg("cantMoveMsgWOBodyOffline", msgWindow);
+          return OnCopyCompleted(srcSupport, false);
+        }
+      }
+    }
+  }
+
+  if (!CheckIfSpaceForCopy(msgWindow, srcFolder, srcSupport, isMove,
+                           totalMsgSize))
+    return NS_OK;
+
+  NS_ENSURE_SUCCESS(rv, rv);
+  bool storeDidCopy = false;
+  nsCOMPtr<nsIMsgPluggableStore> msgStore;
+  rv = GetMsgStore(getter_AddRefs(msgStore));
+  NS_ENSURE_SUCCESS(rv, rv);
+  nsCOMPtr<nsITransaction> undoTxn;
+  nsCOMPtr<nsIArray> dstHdrs;
+  rv = msgStore->CopyMessages(isMove, messages, this, listener,
+                              getter_AddRefs(dstHdrs), getter_AddRefs(undoTxn),
+                              &storeDidCopy);
+  if (storeDidCopy)
+  {
+    NS_ASSERTION(undoTxn, "if store does copy, it needs to add undo action");
+    if (msgWindow && undoTxn)
+    {
+      nsCOMPtr<nsITransactionManager> txnMgr;
+      msgWindow->GetTransactionManager(getter_AddRefs(txnMgr));
+      if (txnMgr)
+        txnMgr->DoTransaction(undoTxn);
+    }
+    if (isMove)
+      srcFolder->NotifyFolderEvent(NS_SUCCEEDED(rv) ? mDeleteOrMoveMsgCompletedAtom :
+                                                      mDeleteOrMoveMsgFailedAtom);
+
+    if (NS_SUCCEEDED(rv)) {
+      // If the store did the copy, like maildir, we need to mark messages on the server.
+      // Otherwise that's done in EndMove().
+      nsCOMPtr <nsIMsgLocalMailFolder> localDstFolder;
+      QueryInterface(NS_GET_IID(nsIMsgLocalMailFolder), getter_AddRefs(localDstFolder));
+      if (localDstFolder)
+      {
+        // If we are the trash and a local msg is being moved to us, mark the source
+        // for delete from server, if so configured.
+        if (mFlags & nsMsgFolderFlags::Trash)
+        {
+          // If we're deleting on all moves, we'll mark this message for deletion when
+          // we call DeleteMessages on the source folder. So don't mark it for deletion
+          // here, in that case.
+          if (!GetDeleteFromServerOnMove())
+            localDstFolder->MarkMsgsOnPop3Server(dstHdrs, POP3_DELETE);
+        }
+      }
+    }
+    return rv;
+  }
+  // If the store doesn't do the copy, we'll stream the source messages into
+  // the target folder, using getMsgInputStream and getNewMsgOutputStream.
+
+  // don't update the counts in the dest folder until it is all over
+  EnableNotifications(allMessageCountNotifications, false, false /*dbBatching*/);  //dest folder doesn't need db batching
+
+  // sort the message array by key
+  uint32_t numMsgs = 0;
+  messages->GetLength(&numMsgs);
+  nsTArray<nsMsgKey> keyArray(numMsgs);
+  if (numMsgs > 1)
+  {
+    for (uint32_t i = 0; i < numMsgs; i++)
+    {
+      nsCOMPtr<nsIMsgDBHdr> aMessage = do_QueryElementAt(messages, i, &rv);
+      if (NS_SUCCEEDED(rv) && aMessage)
+      {
+        nsMsgKey key;
+        aMessage->GetMessageKey(&key);
+        keyArray.AppendElement(key);
+      }
+    }
+
+    keyArray.Sort();
+
+    nsCOMPtr<nsIMutableArray> sortedMsgs(do_CreateInstance(NS_ARRAY_CONTRACTID));
+    rv = MessagesInKeyOrder(keyArray, srcFolder, sortedMsgs);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    rv = InitCopyState(srcSupport, sortedMsgs, isMove, listener, msgWindow, isFolder, allowUndo);
+  }
+  else
+    rv = InitCopyState(srcSupport, messages, isMove, listener, msgWindow, isFolder, allowUndo);
+
+  if (NS_FAILED(rv))
+  {
+    ThrowAlertMsg("operationFailedFolderBusy", msgWindow);
+    (void) OnCopyCompleted(srcSupport, false);
+    return rv;
+  }
+
+  if (!MsgLowerCaseEqualsLiteral(protocolType, "mailbox"))
+  {
+    mCopyState->m_dummyEnvelopeNeeded = true;
+    nsParseMailMessageState* parseMsgState = new nsParseMailMessageState();
+    if (parseMsgState)
+    {
+      nsCOMPtr<nsIMsgDatabase> msgDb;
+      mCopyState->m_parseMsgState = parseMsgState;
+      GetDatabaseWOReparse(getter_AddRefs(msgDb));
+      if (msgDb)
+        parseMsgState->SetMailDB(msgDb);
+    }
+  }
+
+  // undo stuff
+  if (allowUndo)    //no undo for folder move/copy or or move/copy from search window
+  {
+    RefPtr<nsLocalMoveCopyMsgTxn> msgTxn = new nsLocalMoveCopyMsgTxn;
+    if (msgTxn && NS_SUCCEEDED(msgTxn->Init(srcFolder, this, isMove)))
+    {
+      msgTxn->SetMsgWindow(msgWindow);
+      if (isMove)
+      {
+        if (mFlags & nsMsgFolderFlags::Trash)
+          msgTxn->SetTransactionType(nsIMessenger::eDeleteMsg);
+        else
+          msgTxn->SetTransactionType(nsIMessenger::eMoveMsg);
+      }
+      else
+        msgTxn->SetTransactionType(nsIMessenger::eCopyMsg);
+      msgTxn.swap(mCopyState->m_undoMsgTxn);
+    }
+  }
+
+  if (numMsgs > 1 && ((MsgLowerCaseEqualsLiteral(protocolType, "imap") && !WeAreOffline()) ||
+                      MsgLowerCaseEqualsLiteral(protocolType, "mailbox")))
+  {
+    mCopyState->m_copyingMultipleMessages = true;
+    rv = CopyMessagesTo(mCopyState->m_messages, keyArray, msgWindow, this, isMove);
+    if (NS_FAILED(rv))
+    {
+      NS_ERROR("copy message failed");
+      (void) OnCopyCompleted(srcSupport, false);
+    }
+  }
+  else
+  {
+    nsCOMPtr<nsISupports> msgSupport = do_QueryElementAt(mCopyState->m_messages, 0);
+    if (msgSupport)
+    {
+      rv = CopyMessageTo(msgSupport, this, msgWindow, isMove);
+      if (NS_FAILED(rv))
+      {
+        NS_ASSERTION(false, "copy message failed");
+        (void) OnCopyCompleted(srcSupport, false);
+      }
+    }
+  }
+  // if this failed immediately, need to turn back on notifications and inform FE.
+  if (NS_FAILED(rv))
+  {
+    if (isMove)
+      srcFolder->NotifyFolderEvent(mDeleteOrMoveMsgFailedAtom);
+    EnableNotifications(allMessageCountNotifications, true, false /*dbBatching*/);  //dest folder doesn't need db batching
+  }
+  return rv;
+}
+// for srcFolder that are on different server than the dstFolder.
+// "this" is the parent of the new dest folder.
+nsresult
+nsMsgLocalMailFolder::CopyFolderAcrossServer(nsIMsgFolder* srcFolder, nsIMsgWindow *msgWindow,
+                  nsIMsgCopyServiceListener *listener )
+{
+  mInitialized = true;
+
+  nsString folderName;
+  srcFolder->GetName(folderName);
+
+  nsCOMPtr<nsIMsgFolder> newMsgFolder;
+  nsresult rv = CreateSubfolderInternal(folderName, msgWindow, getter_AddRefs(newMsgFolder));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsISimpleEnumerator> messages;
+  rv = srcFolder->GetMessages(getter_AddRefs(messages));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsIMutableArray> msgArray(do_CreateInstance(NS_ARRAY_CONTRACTID));
+
+  bool hasMoreElements = false;
+  nsCOMPtr<nsISupports> aSupport;
+
+  if (messages)
+    rv = messages->HasMoreElements(&hasMoreElements);
+
+  while (NS_SUCCEEDED(rv) && hasMoreElements)
+  {
+    rv = messages->GetNext(getter_AddRefs(aSupport));
+    NS_ENSURE_SUCCESS(rv, rv);
+    rv = msgArray->AppendElement(aSupport, false);
+    NS_ENSURE_SUCCESS(rv, rv);
+    rv = messages->HasMoreElements(&hasMoreElements);
+  }
+
+  uint32_t numMsgs=0;
+  msgArray->GetLength(&numMsgs);
+
+  if (numMsgs > 0 )   //if only srcFolder has messages..
+    newMsgFolder->CopyMessages(srcFolder, msgArray, false, msgWindow, listener, true /* is folder*/, false /* allowUndo */);
+  else
+  {
+    nsCOMPtr <nsIMsgLocalMailFolder> localFolder = do_QueryInterface(newMsgFolder);
+    if (localFolder)
+    {
+      // normally these would get called from ::EndCopy when the last message
+      // was finished copying. But since there are no messages, we have to call
+      // them explicitly.
+      nsCOMPtr<nsISupports> srcSupports = do_QueryInterface(newMsgFolder);
+      localFolder->CopyAllSubFolders(srcFolder, msgWindow, listener);
+      return localFolder->OnCopyCompleted(srcSupports, true);
+    }
+  }
+  return NS_OK;  // otherwise the front-end will say Exception::CopyFolder
+}
+
+nsresult    //copy the sub folders
+nsMsgLocalMailFolder::CopyAllSubFolders(nsIMsgFolder *srcFolder,
+                                      nsIMsgWindow *msgWindow,
+                                      nsIMsgCopyServiceListener *listener )
+{
+  nsCOMPtr<nsISimpleEnumerator> enumerator;
+  nsresult rv = srcFolder->GetSubFolders(getter_AddRefs(enumerator));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  bool hasMore;
+  while (NS_SUCCEEDED(enumerator->HasMoreElements(&hasMore)) && hasMore)
+  {
+    nsCOMPtr<nsISupports> item;
+    enumerator->GetNext(getter_AddRefs(item));
+
+    nsCOMPtr<nsIMsgFolder> folder(do_QueryInterface(item));
+    if (folder)
+      CopyFolderAcrossServer(folder, msgWindow, listener);
+  }
+  return rv;
+}
+
+NS_IMETHODIMP
+nsMsgLocalMailFolder::CopyFolder( nsIMsgFolder* srcFolder, bool isMoveFolder,
+                                   nsIMsgWindow *msgWindow,
+                                   nsIMsgCopyServiceListener* listener)
+{
+  NS_ENSURE_ARG_POINTER(srcFolder);
+  // isMoveFolder == true when "this" and srcFolder are on same server
+  return isMoveFolder ? CopyFolderLocal(srcFolder, isMoveFolder, msgWindow, listener ) :
+                      CopyFolderAcrossServer(srcFolder, msgWindow, listener );
+}
+
+NS_IMETHODIMP
+nsMsgLocalMailFolder::CopyFolderLocal(nsIMsgFolder *srcFolder,
+                                      bool isMoveFolder,
+                                      nsIMsgWindow *msgWindow,
+                                      nsIMsgCopyServiceListener *aListener)
+{
+  mInitialized = true;
+  bool isChildOfTrash;
+  nsresult rv = IsChildOfTrash(&isChildOfTrash);
+  if (NS_SUCCEEDED(rv) && isChildOfTrash)
+  {
+    // do it just for the parent folder (isMoveFolder is true for parent only) if we are deleting/moving a folder tree
+    // don't confirm for rss folders.
+    if (isMoveFolder)
+    {
+      // if there's a msgWindow, confirm the deletion
+      if (msgWindow) 
+      {
+
+        bool okToDelete = false;
+        ConfirmFolderDeletion(msgWindow, srcFolder, &okToDelete);
+        if (!okToDelete)
+          return NS_MSG_ERROR_COPY_FOLDER_ABORTED;
+      }
+      // if we are moving a favorite folder to trash, we should clear the favorites flag
+      // so it gets removed from the view.
+      srcFolder->ClearFlag(nsMsgFolderFlags::Favorite);
+    }
+
+    bool match = false;
+    rv = srcFolder->MatchOrChangeFilterDestination(nullptr, false, &match);
+    if (match && msgWindow)
+    {
+      bool confirmed = false;
+      srcFolder->ConfirmFolderDeletionForFilter(msgWindow, &confirmed);
+      if (!confirmed)
+        return NS_MSG_ERROR_COPY_FOLDER_ABORTED;
+    }
+  }
+
+  nsAutoString newFolderName;
+  nsAutoString folderName;
+  rv = srcFolder->GetName(folderName);
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  if (!isMoveFolder) {
+    rv = CheckIfFolderExists(folderName, this, msgWindow);
+    if (NS_WARN_IF(NS_FAILED(rv))) {
+      return rv;
+    }
+  }
+  else
+  {
+    // If folder name already exists in destination, generate a new unique name.
+    bool containsChild = true;
+    uint32_t i;
+    for (i = 1; containsChild; i++) {
+      newFolderName.Assign(folderName);
+      if (i > 1) {
+        // This could be localizable but Toolkit is fine without it, see
+        // mozilla/toolkit/content/contentAreaUtils.js::uniqueFile()
+        newFolderName.Append('(');
+        newFolderName.AppendInt(i);
+        newFolderName.Append(')');
+      }
+      rv = ContainsChildNamed(newFolderName, &containsChild);
+      if (NS_WARN_IF(NS_FAILED(rv))) {
+        return rv;
+      }
+    }
+
+    // 'i' is one more than the number of iterations done
+    // and the number tacked onto the name of the folder.
+    if (i > 2 && !isChildOfTrash) {
+      // Folder name already exists, ask if rename is OK.
+      // If moving to Trash, don't ask and do it.
+      if (!ConfirmAutoFolderRename(msgWindow, folderName, newFolderName))
+        return NS_MSG_ERROR_COPY_FOLDER_ABORTED;
+    }
+  }
+
+  nsCOMPtr<nsIMsgPluggableStore> msgStore;
+  rv = GetMsgStore(getter_AddRefs(msgStore));
+  if (NS_WARN_IF(NS_FAILED(rv))) {
+    return rv;
+  }
+
+  return msgStore->CopyFolder(srcFolder, this, isMoveFolder, msgWindow,
+                              aListener, newFolderName);
+}
+
+NS_IMETHODIMP
+nsMsgLocalMailFolder::CopyFileMessage(nsIFile* aFile, 
+                                      nsIMsgDBHdr *msgToReplace,
+                                      bool isDraftOrTemplate,
+                                      uint32_t newMsgFlags,
+                                      const nsACString &aNewMsgKeywords,
+                                      nsIMsgWindow *msgWindow,
+                                      nsIMsgCopyServiceListener* listener)
+{
+  NS_ENSURE_ARG_POINTER(aFile);
+  nsresult rv = NS_ERROR_NULL_POINTER;
+  nsParseMailMessageState* parseMsgState = nullptr;
+  int64_t fileSize = 0;
+
+  nsCOMPtr<nsISupports> fileSupport(do_QueryInterface(aFile, &rv));
+
+  aFile->GetFileSize(&fileSize);
+  if (!CheckIfSpaceForCopy(msgWindow, nullptr, fileSupport, false, fileSize))
+    return NS_OK;
+
+  nsCOMPtr<nsIMutableArray> messages(do_CreateInstance(NS_ARRAY_CONTRACTID));
+
+  if (msgToReplace)
+    messages->AppendElement(msgToReplace, false);
+
+  rv = InitCopyState(fileSupport, messages, msgToReplace ? true : false,
+                     listener, msgWindow, false, false);
+  if (NS_SUCCEEDED(rv))
+  {
+    if (mCopyState)
+      mCopyState->m_newMsgKeywords = aNewMsgKeywords;
+
+    parseMsgState = new nsParseMailMessageState();
+    NS_ENSURE_TRUE(parseMsgState, NS_ERROR_OUT_OF_MEMORY);
+      nsCOMPtr<nsIMsgDatabase> msgDb;
+      mCopyState->m_parseMsgState = parseMsgState;
+      GetDatabaseWOReparse(getter_AddRefs(msgDb));
+      if (msgDb)
+        parseMsgState->SetMailDB(msgDb);
+
+    nsCOMPtr<nsIInputStream> inputStream;
+    rv = NS_NewLocalFileInputStream(getter_AddRefs(inputStream), aFile);
+
+    // All or none for adding a message file to the store
+    if (NS_SUCCEEDED(rv) && fileSize > PR_INT32_MAX)
+        rv = NS_ERROR_ILLEGAL_VALUE; // may need error code for max msg size
+
+    if (NS_SUCCEEDED(rv) && inputStream) 
+    {
+      char buffer[5];
+      uint32_t readCount;
+      rv = inputStream->Read(buffer, 5, &readCount);
+      if (NS_SUCCEEDED(rv)) 
+      {
+        if (strncmp(buffer, "From ", 5))
+          mCopyState->m_dummyEnvelopeNeeded = true;
+        nsCOMPtr <nsISeekableStream> seekableStream = do_QueryInterface(inputStream, &rv);
+        if (NS_SUCCEEDED(rv))
+          seekableStream->Seek(nsISeekableStream::NS_SEEK_SET, 0);
+      }
+    }
+
+     mCopyState->m_wholeMsgInStream = true;
+     if (NS_SUCCEEDED(rv))
+      rv = BeginCopy(nullptr);
+
+    if (NS_SUCCEEDED(rv))
+      rv = CopyData(inputStream, (int32_t) fileSize);
+
+    if (NS_SUCCEEDED(rv))
+      rv = EndCopy(true);
+
+    //mDatabase should have been initialized above - if we got msgDb
+    // If we were going to delete, here is where we would do it. But because
+    // existing code already supports doing those deletes, we are just going
+    // to end the copy.
+    if (NS_SUCCEEDED(rv) && msgToReplace && mDatabase)
+      rv = OnCopyCompleted(fileSupport, true);
+
+    if (inputStream)
+      inputStream->Close();
+  }
+
+  if (NS_FAILED(rv))
+    (void) OnCopyCompleted(fileSupport, false);
+
+  return rv;
+}
+
+nsresult nsMsgLocalMailFolder::DeleteMessage(nsISupports *message,
+                                             nsIMsgWindow *msgWindow,
+                                             bool deleteStorage, bool commit)
+{
+  nsresult rv = NS_OK;
+  if (deleteStorage)
+  {
+    nsCOMPtr <nsIMsgDBHdr> msgDBHdr(do_QueryInterface(message, &rv));
+
+    if (NS_SUCCEEDED(rv))
+    {
+      GetDatabase();
+      if (mDatabase)
+        rv = mDatabase->DeleteHeader(msgDBHdr, nullptr, commit, true);
+    }
+  }
+  return rv;
+}
+
+NS_IMETHODIMP nsMsgLocalMailFolder::GetNewMessages(nsIMsgWindow *aWindow, nsIUrlListener *aListener)
+{
+  nsCOMPtr<nsIMsgIncomingServer> server;
+  nsresult rv = GetServer(getter_AddRefs(server));
+  NS_ENSURE_SUCCESS(rv, NS_MSG_INVALID_OR_MISSING_SERVER);
+
+  nsCOMPtr<nsILocalMailIncomingServer> localMailServer = do_QueryInterface(server, &rv);
+  NS_ENSURE_SUCCESS(rv, NS_MSG_INVALID_OR_MISSING_SERVER);
+
+  // XXX todo, move all this into nsILocalMailIncomingServer's GetNewMail
+  // so that we don't have to have RSS foo here.
+  nsCOMPtr<nsIRssIncomingServer> rssServer = do_QueryInterface(server, &rv);
+  if (NS_SUCCEEDED(rv))
+    return localMailServer->GetNewMail(aWindow, aListener, this, nullptr);
+
+  nsCOMPtr<nsIMsgFolder> inbox;
+  nsCOMPtr<nsIMsgFolder> rootFolder;
+  rv = server->GetRootMsgFolder(getter_AddRefs(rootFolder));
+  if (NS_SUCCEEDED(rv) && rootFolder)
+  {
+    rootFolder->GetFolderWithFlags(nsMsgFolderFlags::Inbox, getter_AddRefs(inbox));
+  }
+  nsCOMPtr<nsIMsgLocalMailFolder> localInbox = do_QueryInterface(inbox, &rv);
+  if (NS_SUCCEEDED(rv))
+  {
+    bool valid = false;
+    nsCOMPtr <nsIMsgDatabase> db;
+    // this will kick off a reparse if the db is out of date.
+    rv = localInbox->GetDatabaseWithReparse(nullptr, aWindow, getter_AddRefs(db));
+    if (NS_SUCCEEDED(rv))
+    {
+      db->GetSummaryValid(&valid);
+      rv = valid ? localMailServer->GetNewMail(aWindow, aListener, inbox, nullptr) :
+                   localInbox->SetCheckForNewMessagesAfterParsing(true);
+    }
+  }
+  return rv;
+}
+
+nsresult nsMsgLocalMailFolder::WriteStartOfNewMessage()
+{
+  nsCOMPtr <nsISeekableStream> seekableStream = do_QueryInterface(mCopyState->m_fileStream);
+  int64_t filePos;
+  seekableStream->Tell(&filePos);
+
+  // CopyFileMessage() and CopyMessages() from servers other than pop3
+  if (mCopyState->m_parseMsgState)
+  {
+    if (mCopyState->m_parseMsgState->m_newMsgHdr)
+      mCopyState->m_parseMsgState->m_newMsgHdr->GetMessageKey(&mCopyState->m_curDstKey);
+    mCopyState->m_parseMsgState->SetEnvelopePos(filePos);
+    mCopyState->m_parseMsgState->SetState(nsIMsgParseMailMsgState::ParseHeadersState);
+  }
+  if (mCopyState->m_dummyEnvelopeNeeded)
+  {
+    nsCString result;
+    nsAutoCString nowStr;
+    MsgGenerateNowStr(nowStr);
+    result.AppendLiteral("From - ");
+    result.Append(nowStr);
+    result.Append(MSG_LINEBREAK);
+
+    // *** jt - hard code status line for now; come back later
+    nsresult rv;
+    nsCOMPtr <nsIMsgDBHdr> curSourceMessage = do_QueryElementAt(mCopyState->m_messages,
+                                                                mCopyState->m_curCopyIndex, &rv);
+
+    char statusStrBuf[50];
+    if (curSourceMessage)
+    {
+      uint32_t dbFlags = 0;
+      curSourceMessage->GetFlags(&dbFlags);
+
+      // write out x-mozilla-status, but make sure we don't write out nsMsgMessageFlags::Offline
+      PR_snprintf(statusStrBuf, sizeof(statusStrBuf), X_MOZILLA_STATUS_FORMAT MSG_LINEBREAK,
+        dbFlags & ~(nsMsgMessageFlags::RuntimeOnly | nsMsgMessageFlags::Offline) & 0x0000FFFF);
+    }
+    else
+      strcpy(statusStrBuf, "X-Mozilla-Status: 0001" MSG_LINEBREAK);
+    uint32_t bytesWritten;
+    mCopyState->m_fileStream->Write(result.get(), result.Length(), &bytesWritten);
+    if (mCopyState->m_parseMsgState)
+        mCopyState->m_parseMsgState->ParseAFolderLine(
+          result.get(), result.Length());
+    mCopyState->m_fileStream->Write(statusStrBuf, strlen(statusStrBuf), &bytesWritten);
+    if (mCopyState->m_parseMsgState)
+        mCopyState->m_parseMsgState->ParseAFolderLine(
+        statusStrBuf, strlen(statusStrBuf));
+    result = "X-Mozilla-Status2: 00000000" MSG_LINEBREAK;
+    mCopyState->m_fileStream->Write(result.get(), result.Length(), &bytesWritten);
+    if (mCopyState->m_parseMsgState)
+        mCopyState->m_parseMsgState->ParseAFolderLine(
+          result.get(), result.Length());
+    result = X_MOZILLA_KEYWORDS;
+    mCopyState->m_fileStream->Write(result.get(), result.Length(), &bytesWritten);
+    if (mCopyState->m_parseMsgState)
+        mCopyState->m_parseMsgState->ParseAFolderLine(
+          result.get(), result.Length());
+   mCopyState->m_fromLineSeen = true;
+  }
+  else
+    mCopyState->m_fromLineSeen = false;
+
+  mCopyState->m_curCopyIndex++;
+  return NS_OK;
+}
+
+nsresult nsMsgLocalMailFolder::InitCopyMsgHdrAndFileStream()
+{
+  nsCOMPtr<nsIMsgPluggableStore> msgStore;
+  nsresult rv = GetMsgStore(getter_AddRefs(mCopyState->m_msgStore));
+  NS_ENSURE_SUCCESS(rv, rv);
+  bool reusable;
+  rv = mCopyState->m_msgStore->
+         GetNewMsgOutputStream(this, getter_AddRefs(mCopyState->m_newHdr),
+                               &reusable,
+                               getter_AddRefs(mCopyState->m_fileStream));
+  NS_ENSURE_SUCCESS(rv, rv);
+  if (mCopyState->m_parseMsgState)
+    mCopyState->m_parseMsgState->SetNewMsgHdr(mCopyState->m_newHdr);
+  return rv;
+}
+
+//nsICopyMessageListener
+NS_IMETHODIMP nsMsgLocalMailFolder::BeginCopy(nsIMsgDBHdr *message)
+{
+  if (!mCopyState)
+    return NS_ERROR_NULL_POINTER;
+
+  nsresult rv;
+  if (!mCopyState->m_copyingMultipleMessages)
+  {
+    rv = InitCopyMsgHdrAndFileStream();
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+  nsCOMPtr <nsISeekableStream> seekableStream = do_QueryInterface(mCopyState->m_fileStream, &rv);
+
+  //  XXX ToDo: When copying multiple messages from a non-offline-enabled IMAP
+  //  server, this fails. (The copy succeeds because the file stream is created
+  //  subsequently in StartMessage) We should not be warning on an expected error.
+  //  Perhaps there are unexpected consequences of returning early?
+  NS_ENSURE_SUCCESS(rv, rv);
+  seekableStream->Seek(nsISeekableStream::NS_SEEK_END, 0);
+
+  int32_t messageIndex = (mCopyState->m_copyingMultipleMessages) ? mCopyState->m_curCopyIndex - 1 : mCopyState->m_curCopyIndex;
+  NS_ASSERTION(!mCopyState->m_copyingMultipleMessages || messageIndex >= 0, "messageIndex invalid");
+  // by the time we get here, m_curCopyIndex is 1 relative because WriteStartOfNewMessage increments it
+  mCopyState->m_messages->QueryElementAt(messageIndex, NS_GET_IID(nsIMsgDBHdr),
+                                  (void **)getter_AddRefs(mCopyState->m_message));
+  // The flags of the source message can get changed when it is deleted, so
+  // save them here.
+  if (mCopyState->m_message)
+    mCopyState->m_message->GetFlags(&(mCopyState->m_flags));
+  DisplayMoveCopyStatusMsg();
+  if (mCopyState->m_listener)
+    mCopyState->m_listener->OnProgress(mCopyState->m_curCopyIndex, mCopyState->m_totalMsgCount);
+  // if we're copying more than one message, StartMessage will handle this.
+  return !mCopyState->m_copyingMultipleMessages ? WriteStartOfNewMessage() : rv;
+}
+
+NS_IMETHODIMP nsMsgLocalMailFolder::CopyData(nsIInputStream *aIStream, int32_t aLength)
+{
+  //check to make sure we have control of the write.
+  bool haveSemaphore;
+  nsresult rv = NS_OK;
+
+  rv = TestSemaphore(static_cast<nsIMsgLocalMailFolder*>(this), &haveSemaphore);
+  if (NS_FAILED(rv))
+    return rv;
+  if (!haveSemaphore)
+    return NS_MSG_FOLDER_BUSY;
+
+  if (!mCopyState)
+    return NS_ERROR_OUT_OF_MEMORY;
+
+  uint32_t readCount;
+  //allocate one extra byte for '\0' at the end and another extra byte at the
+  //front to insert a '>' if we have a "From" line
+  //allocate 2 more for crlf that may be needed for those without crlf at end of file
+  if ( aLength + mCopyState->m_leftOver + 4 > mCopyState->m_dataBufferSize )
+  {
+    char *newBuffer = (char *) PR_REALLOC(mCopyState->m_dataBuffer, aLength + mCopyState->m_leftOver + 4);
+    if (!newBuffer)
+      return NS_ERROR_OUT_OF_MEMORY;
+
+    mCopyState->m_dataBuffer = newBuffer;
+    mCopyState->m_dataBufferSize = aLength + mCopyState->m_leftOver + 3;
+  }
+
+  nsCOMPtr <nsISeekableStream> seekableStream = do_QueryInterface(mCopyState->m_fileStream, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+  seekableStream->Seek(nsISeekableStream::NS_SEEK_END, 0);
+
+  rv = aIStream->Read(mCopyState->m_dataBuffer + mCopyState->m_leftOver + 1, aLength, &readCount);
+  NS_ENSURE_SUCCESS(rv, rv);
+  mCopyState->m_leftOver += readCount;
+  mCopyState->m_dataBuffer[mCopyState->m_leftOver + 1] ='\0';
+  char *start = mCopyState->m_dataBuffer + 1;
+  char *endBuffer = mCopyState->m_dataBuffer + mCopyState->m_leftOver + 1;
+
+  uint32_t lineLength;
+  uint32_t bytesWritten;
+
+  while (1)
+  {
+    char *end = PL_strnpbrk(start, "\r\n", endBuffer - start);
+    if (!end)
+    {
+      mCopyState->m_leftOver -= (start - mCopyState->m_dataBuffer - 1);
+      // In CopyFileMessage, a complete message is being copied in a single
+      // call to CopyData, and if it does not have a LINEBREAK at the EOF,
+      // then end will be null after reading the last line, and we need
+      // to append the LINEBREAK to the buffer to enable transfer of the last line.
+      if (mCopyState->m_wholeMsgInStream)
+      {
+        end = start + mCopyState->m_leftOver;
+        memcpy(end, MSG_LINEBREAK "\0", MSG_LINEBREAK_LEN + 1);
+      }
+      else
+      {
+        memmove (mCopyState->m_dataBuffer + 1, start, mCopyState->m_leftOver);
+        break;
+      }
+    }
+
+    //need to set the linebreak_len each time
+    uint32_t linebreak_len = 1; //assume CR or LF
+    if (*end == '\r' && *(end+1) == '\n')
+      linebreak_len = 2;  //CRLF
+
+    if (!mCopyState->m_fromLineSeen)
+    {
+      mCopyState->m_fromLineSeen = true;
+      NS_ASSERTION(strncmp(start, "From ", 5) == 0,
+        "Fatal ... bad message format\n");
+    }
+    else if (strncmp(start, "From ", 5) == 0)
+    {
+      //if we're at the beginning of the buffer, we've reserved a byte to
+      //insert a '>'.  If we're in the middle, we're overwriting the previous
+      //line ending, but we've already written it to m_fileStream, so it's OK.
+      *--start = '>';
+    }
+
+    lineLength = end - start + linebreak_len;
+    rv = mCopyState->m_fileStream->Write(start, lineLength, &bytesWritten);
+    if (bytesWritten != lineLength || NS_FAILED(rv))
+    {
+      ThrowAlertMsg("copyMsgWriteFailed", mCopyState->m_msgWindow);
+      mCopyState->m_writeFailed = true;
+      return NS_MSG_ERROR_WRITING_MAIL_FOLDER;
+    }
+
+    if (mCopyState->m_parseMsgState)
+      mCopyState->m_parseMsgState->ParseAFolderLine(start, lineLength);
+
+    start = end + linebreak_len;
+    if (start >= endBuffer)
+    {
+      mCopyState->m_leftOver = 0;
+      break;
+    }
+  }
+  return rv;
+}
+
+void nsMsgLocalMailFolder::CopyPropertiesToMsgHdr(nsIMsgDBHdr *destHdr,
+                                                  nsIMsgDBHdr *srcHdr,
+                                                  bool aIsMove)
+{
+  nsresult rv;
+  nsCOMPtr<nsIPrefBranch> prefBranch(do_GetService(NS_PREFSERVICE_CONTRACTID, &rv));
+  NS_ENSURE_SUCCESS_VOID(rv);
+
+  nsCString dontPreserve;
+
+  // These preferences exist so that extensions can control which properties
+  // are preserved in the database when a message is moved or copied. All
+  // properties are preserved except those listed in these preferences
+  if (aIsMove)
+    prefBranch->GetCharPref("mailnews.database.summary.dontPreserveOnMove",
+                            getter_Copies(dontPreserve));
+  else
+    prefBranch->GetCharPref("mailnews.database.summary.dontPreserveOnCopy",
+                            getter_Copies(dontPreserve));
+
+  CopyHdrPropertiesWithSkipList(destHdr, srcHdr, dontPreserve);
+}
+
+void
+nsMsgLocalMailFolder::CopyHdrPropertiesWithSkipList(nsIMsgDBHdr *destHdr,
+                                                    nsIMsgDBHdr *srcHdr,
+                                                    const nsCString &skipList)
+{
+  nsCOMPtr<nsIUTF8StringEnumerator> propertyEnumerator;
+  nsresult rv = srcHdr->GetPropertyEnumerator(getter_AddRefs(propertyEnumerator));
+  NS_ENSURE_SUCCESS_VOID(rv);
+
+  // We'll add spaces at beginning and end so we can search for space-name-space
+  nsCString dontPreserveEx(NS_LITERAL_CSTRING(" "));
+  dontPreserveEx.Append(skipList);
+  dontPreserveEx.AppendLiteral(" ");
+
+  nsAutoCString property;
+  nsCString sourceString;
+  bool hasMore;
+  while (NS_SUCCEEDED(propertyEnumerator->HasMore(&hasMore)) && hasMore)
+  {
+    propertyEnumerator->GetNext(property);
+    nsAutoCString propertyEx(NS_LITERAL_CSTRING(" "));
+    propertyEx.Append(property);
+    propertyEx.AppendLiteral(" ");
+    if (dontPreserveEx.Find(propertyEx) != -1) // -1 is not found
+      continue;
+
+    srcHdr->GetStringProperty(property.get(), getter_Copies(sourceString));
+    destHdr->SetStringProperty(property.get(), sourceString.get());
+  }
+
+  nsMsgLabelValue label = 0;
+  srcHdr->GetLabel(&label);
+  destHdr->SetLabel(label);
+}
+
+NS_IMETHODIMP nsMsgLocalMailFolder::EndCopy(bool aCopySucceeded)
+{
+  if (!mCopyState)
+    return NS_OK;
+
+  // we are the destination folder for a move/copy
+  nsresult rv = aCopySucceeded ? NS_OK : NS_ERROR_FAILURE;
+
+  if (!aCopySucceeded || mCopyState->m_writeFailed)
+  {
+    if (mCopyState->m_fileStream)
+    {
+      if (mCopyState->m_curDstKey != nsMsgKey_None)
+        mCopyState->m_msgStore->DiscardNewMessage(mCopyState->m_fileStream,
+                                                  mCopyState->m_newHdr);
+      mCopyState->m_fileStream->Close();
+    }
+
+    if (!mCopyState->m_isMove)
+    {
+      // passing true because the messages that have been successfully
+      // copied have their corresponding hdrs in place. The message that has
+      // failed has been truncated so the msf file and berkeley mailbox
+      // are in sync.
+      (void) OnCopyCompleted(mCopyState->m_srcSupport, true);
+      // enable the dest folder
+      EnableNotifications(allMessageCountNotifications, true, false /*dbBatching*/); //dest folder doesn't need db batching
+    }
+    return NS_OK;
+  }
+
+  bool multipleCopiesFinished = (mCopyState->m_curCopyIndex >= mCopyState->m_totalMsgCount);
+
+  RefPtr<nsLocalMoveCopyMsgTxn> localUndoTxn = mCopyState->m_undoMsgTxn;
+
+  NS_ASSERTION(mCopyState->m_leftOver == 0, "whoops, something wrong with previous copy");
+  mCopyState->m_leftOver = 0; // reset to 0.
+  // need to reset this in case we're move/copying multiple msgs.
+  mCopyState->m_fromLineSeen = false;
+
+  // flush the copied message. We need a close at the end to get the
+  // file size and time updated correctly.
+  //
+  // These filestream closes are handled inconsistently in the code. In some
+  // cases, this is done in EndMessage, while in others it is done here in
+  // EndCopy. When we do the close in EndMessage, we'll set
+  // mCopyState->m_fileStream to null since it is no longer needed, and detect
+  // here the null stream so we know that we don't have to close it here.
+  //
+  // Similarly, m_parseMsgState->GetNewMsgHdr() returns a null hdr if the hdr
+  // has already been processed by EndMessage so it is not doubly added here.
+
+  nsCOMPtr <nsISeekableStream> seekableStream(do_QueryInterface(mCopyState->m_fileStream));
+  if (seekableStream)
+  {
+    if (mCopyState->m_dummyEnvelopeNeeded)
+    {
+      uint32_t bytesWritten;
+      seekableStream->Seek(nsISeekableStream::NS_SEEK_END, 0);
+      mCopyState->m_fileStream->Write(MSG_LINEBREAK, MSG_LINEBREAK_LEN, &bytesWritten);
+      if (mCopyState->m_parseMsgState)
+        mCopyState->m_parseMsgState->ParseAFolderLine(CRLF, MSG_LINEBREAK_LEN);
+    }
+    rv = mCopyState->m_msgStore->FinishNewMessage(mCopyState->m_fileStream,
+                                                  mCopyState->m_newHdr);
+    if (NS_SUCCEEDED(rv) && mCopyState->m_newHdr)
+      mCopyState->m_newHdr->GetMessageKey(&mCopyState->m_curDstKey);
+    if (multipleCopiesFinished)
+      mCopyState->m_fileStream->Close();
+    else
+      mCopyState->m_fileStream->Flush();
+  }
+  //Copy the header to the new database
+  if (mCopyState->m_message)
+  {
+    //  CopyMessages() goes here, and CopyFileMessages() with metadata to save;
+    nsCOMPtr<nsIMsgDBHdr> newHdr;
+    if (!mCopyState->m_parseMsgState)
+    {
+      if (mCopyState->m_destDB)
+      {
+        if (mCopyState->m_newHdr)
+        {
+          newHdr = mCopyState->m_newHdr;
+          CopyHdrPropertiesWithSkipList(newHdr, mCopyState->m_message,
+                                        NS_LITERAL_CSTRING("storeToken msgOffset"));
+//          UpdateNewMsgHdr(mCopyState->m_message, newHdr);
+          // We need to copy more than just what UpdateNewMsgHdr does. In fact,
+          // I think we want to copy almost every property other than
+          // storeToken and msgOffset.
+          mCopyState->m_destDB->AddNewHdrToDB(newHdr, true);
+        }
+        else
+        {
+        rv = mCopyState->m_destDB->CopyHdrFromExistingHdr(mCopyState->m_curDstKey,
+          mCopyState->m_message, true,
+          getter_AddRefs(newHdr));
+        }
+        uint32_t newHdrFlags;
+        if (newHdr)
+        {
+          // turn off offline flag - it's not valid for local mail folders.
+          newHdr->AndFlags(~nsMsgMessageFlags::Offline, &newHdrFlags);
+          mCopyState->m_destMessages->AppendElement(newHdr, false);
+        }
+      }
+      // we can do undo with the dest folder db, see bug #198909
+      //else
+      //  mCopyState->m_undoMsgTxn = nullptr; //null out the transaction because we can't undo w/o the msg db
+    }
+
+    // if we plan on allowing undo, (if we have a mCopyState->m_parseMsgState or not)
+    // we need to save the source and dest keys on the undo txn.
+    // see bug #179856 for details
+    bool isImap;
+    if (NS_SUCCEEDED(rv) && localUndoTxn) {
+      localUndoTxn->GetSrcIsImap(&isImap);
+      if (!isImap || !mCopyState->m_copyingMultipleMessages)
+      {
+        nsMsgKey aKey;
+        uint32_t statusOffset;
+        mCopyState->m_message->GetMessageKey(&aKey);
+        mCopyState->m_message->GetStatusOffset(&statusOffset);
+        localUndoTxn->AddSrcKey(aKey);
+        localUndoTxn->AddSrcStatusOffset(statusOffset);
+        localUndoTxn->AddDstKey(mCopyState->m_curDstKey);
+      }
+    }
+  }
+  nsCOMPtr<nsIMsgDBHdr> newHdr;
+  // CopyFileMessage() and CopyMessages() from servers other than mailbox
+  if (mCopyState->m_parseMsgState)
+  {
+    nsCOMPtr<nsIMsgDatabase> msgDb;
+    mCopyState->m_parseMsgState->FinishHeader();
+    GetDatabaseWOReparse(getter_AddRefs(msgDb));
+    if (msgDb)
+    {
+      nsresult result = mCopyState->m_parseMsgState->GetNewMsgHdr(getter_AddRefs(newHdr));
+      // we need to copy newHdr because mCopyState will get cleared 
+      // in OnCopyCompleted, but we need OnCopyCompleted to know about
+      // the newHdr, via mCopyState. And we send a notification about newHdr
+      // after OnCopyCompleted.
+      mCopyState->m_newHdr = newHdr;
+      if (NS_SUCCEEDED(result) && newHdr)
+      {
+        // Copy message metadata.
+        if (mCopyState->m_message)
+        {
+          // Propagate the new flag on an imap to local folder filter action
+          // Flags may get changed when deleting the original source message in
+          // IMAP. We have a copy of the original flags, but parseMsgState has
+          // already tried to decide what those flags should be. Who to believe?
+          // Let's only deal here with the flags that might get changed, Read
+          // and New, and trust upstream code for everything else.
+          uint32_t readAndNew = nsMsgMessageFlags::New | nsMsgMessageFlags::Read;
+          uint32_t newFlags;
+          newHdr->GetFlags(&newFlags);
+          newHdr->SetFlags( (newFlags & ~readAndNew) | 
+                            ((mCopyState->m_flags) & readAndNew));
+
+          // Copy other message properties.
+          CopyPropertiesToMsgHdr(newHdr, mCopyState->m_message, mCopyState->m_isMove);
+        }
+        msgDb->AddNewHdrToDB(newHdr, true);
+        if (localUndoTxn)
+        {
+          // ** jt - recording the message size for possible undo use; the
+          // message size is different for pop3 and imap4 messages
+          uint32_t msgSize;
+          newHdr->GetMessageSize(&msgSize);
+          localUndoTxn->AddDstMsgSize(msgSize);
+        }
+
+        mCopyState->m_destMessages->AppendElement(newHdr, false);
+      }
+      // msgDb->SetSummaryValid(true);
+      // msgDb->Commit(nsMsgDBCommitType::kLargeCommit);
+    }
+    else
+      mCopyState->m_undoMsgTxn = nullptr; //null out the transaction because we can't undo w/o the msg db
+
+    mCopyState->m_parseMsgState->Clear();
+    if (mCopyState->m_listener) // CopyFileMessage() only
+      mCopyState->m_listener->SetMessageKey(mCopyState->m_curDstKey);
+  }
+
+  if (!multipleCopiesFinished && !mCopyState->m_copyingMultipleMessages)
+  {
+    // CopyMessages() goes here; CopyFileMessage() never gets in here because
+    // curCopyIndex will always be less than the mCopyState->m_totalMsgCount
+    nsCOMPtr<nsISupports> aSupport = do_QueryElementAt(mCopyState->m_messages, mCopyState->m_curCopyIndex);
+    rv = CopyMessageTo(aSupport, this, mCopyState->m_msgWindow, mCopyState->m_isMove);
+  }
+  else
+  {
+    // If we have some headers, then there is a source, so notify itemMoveCopyCompleted.
+    // If we don't have any headers already, (eg save as draft, send) then notify itemAdded.
+    // This notification is done after the messages are deleted, so that saving a new draft
+    // of a message works correctly -- first an itemDeleted is sent for the old draft, then
+    // an itemAdded for the new draft.
+    uint32_t numHdrs;
+    mCopyState->m_messages->GetLength(&numHdrs);
+
+    if (multipleCopiesFinished && numHdrs && !mCopyState->m_isFolder)
+    {
+      // we need to send this notification before we delete the source messages,
+      // because deleting the source messages clears out the src msg db hdr.
+      nsCOMPtr<nsIMsgFolderNotificationService> notifier(do_GetService(NS_MSGNOTIFICATIONSERVICE_CONTRACTID));
+      if (notifier)
+        notifier->NotifyMsgsMoveCopyCompleted(mCopyState->m_isMove,
+                                              mCopyState->m_messages,
+                                              this, mCopyState->m_destMessages);
+    }
+
+    if (!mCopyState->m_isMove)
+    {
+      if (multipleCopiesFinished)
+      {
+        nsCOMPtr<nsIMsgFolder> srcFolder;
+        srcFolder = do_QueryInterface(mCopyState->m_srcSupport);
+        if (mCopyState->m_isFolder)
+          CopyAllSubFolders(srcFolder, nullptr, nullptr);  //Copy all subfolders then notify completion
+
+        if (mCopyState->m_msgWindow && mCopyState->m_undoMsgTxn)
+        {
+          nsCOMPtr<nsITransactionManager> txnMgr;
+          mCopyState->m_msgWindow->GetTransactionManager(getter_AddRefs(txnMgr));
+          if (txnMgr)
+            txnMgr->DoTransaction(mCopyState->m_undoMsgTxn);
+        }
+
+        // enable the dest folder
+        EnableNotifications(allMessageCountNotifications, true, false /*dbBatching*/); //dest folder doesn't need db batching
+        if (srcFolder && !mCopyState->m_isFolder)
+        {
+          // I'm not too sure of the proper location of this event. It seems to need to be
+          // after the EnableNotifications, or the folder counts can be incorrect
+          // during the mDeleteOrMoveMsgCompletedAtom call.
+          srcFolder->NotifyFolderEvent(mDeleteOrMoveMsgCompletedAtom);
+        }
+        (void) OnCopyCompleted(mCopyState->m_srcSupport, true);
+      }
+    }
+    // Send the itemAdded notification in case we didn't send the itemMoveCopyCompleted notification earlier.
+    // Posting news messages involves this, yet doesn't have the newHdr initialized, so don't send any
+    // notifications in that case.
+    if (!numHdrs && newHdr)
+    {
+      nsCOMPtr<nsIMsgFolderNotificationService> notifier(do_GetService(NS_MSGNOTIFICATIONSERVICE_CONTRACTID));
+      if (notifier)
+      {
+        notifier->NotifyMsgAdded(newHdr);
+        // We do not appear to trigger classification in this case, so let's
+        // paper over the abyss by just sending the classification notification.
+        nsCOMPtr <nsIMutableArray> oneHeaderArray =
+          do_CreateInstance(NS_ARRAY_CONTRACTID);
+        oneHeaderArray->AppendElement(newHdr, false);
+        notifier->NotifyMsgsClassified(oneHeaderArray, false, false);
+        // (We do not add the NotReportedClassified processing flag since we
+        // just reported it!)
+      }
+    }
+  }
+  return rv;
+}
+
+static bool gGotGlobalPrefs;
+static bool gDeleteFromServerOnMove;
+
+bool nsMsgLocalMailFolder::GetDeleteFromServerOnMove()
+{
+  if (!gGotGlobalPrefs)
+  {
+    nsCOMPtr<nsIPrefBranch> pPrefBranch(do_GetService(NS_PREFSERVICE_CONTRACTID));
+    if (pPrefBranch)
+    {
+      pPrefBranch->GetBoolPref("mail.pop3.deleteFromServerOnMove", &gDeleteFromServerOnMove);
+      gGotGlobalPrefs = true;
+    }
+  }
+  return gDeleteFromServerOnMove;
+}
+
+NS_IMETHODIMP nsMsgLocalMailFolder::EndMove(bool moveSucceeded)
+{
+  nsresult rv;
+  if (!mCopyState)
+    return NS_OK;
+
+  if (!moveSucceeded || mCopyState->m_writeFailed)
+  {
+    //Notify that a completion finished.
+    nsCOMPtr<nsIMsgFolder> srcFolder = do_QueryInterface(mCopyState->m_srcSupport, &rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+    srcFolder->NotifyFolderEvent(mDeleteOrMoveMsgFailedAtom);
+
+    /* passing true because the messages that have been successfully copied have their corressponding
+               hdrs in place. The message that has failed has been truncated so the msf file and berkeley mailbox
+               are in sync*/
+
+    (void) OnCopyCompleted(mCopyState->m_srcSupport, true);
+    // enable the dest folder
+    EnableNotifications(allMessageCountNotifications, true, false /*dbBatching*/ );  //dest folder doesn't need db batching
+    return NS_OK;
+  }
+
+  if (mCopyState && mCopyState->m_curCopyIndex >= mCopyState->m_totalMsgCount)
+  {
+    //Notify that a completion finished.
+    nsCOMPtr<nsIMsgFolder> srcFolder = do_QueryInterface(mCopyState->m_srcSupport, &rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+    nsCOMPtr <nsIMsgLocalMailFolder> localSrcFolder = do_QueryInterface(srcFolder);
+    if (localSrcFolder)
+    {
+      // if we are the trash and a local msg is being moved to us, mark the source
+      // for delete from server, if so configured.
+      if (mFlags & nsMsgFolderFlags::Trash)
+      {
+        // if we're deleting on all moves, we'll mark this message for deletion when
+        // we call DeleteMessages on the source folder. So don't mark it for deletion
+        // here, in that case.
+        if (!GetDeleteFromServerOnMove())
+          localSrcFolder->MarkMsgsOnPop3Server(mCopyState->m_messages, POP3_DELETE);
+      }
+    }
+    // lets delete these all at once - much faster that way
+    rv = srcFolder->DeleteMessages(mCopyState->m_messages, mCopyState->m_msgWindow, true, true, nullptr, mCopyState->m_allowUndo);
+    AutoCompact(mCopyState->m_msgWindow);
+
+    // enable the dest folder
+    EnableNotifications(allMessageCountNotifications, true, false /*dbBatching*/); //dest folder doesn't need db batching
+    // I'm not too sure of the proper location of this event. It seems to need to be
+    // after the EnableNotifications, or the folder counts can be incorrect
+    // during the mDeleteOrMoveMsgCompletedAtom call.
+    srcFolder->NotifyFolderEvent(NS_SUCCEEDED(rv) ? mDeleteOrMoveMsgCompletedAtom : mDeleteOrMoveMsgFailedAtom);
+
+    if (NS_SUCCEEDED(rv) && mCopyState->m_msgWindow && mCopyState->m_undoMsgTxn)
+    {
+      nsCOMPtr<nsITransactionManager> txnMgr;
+      mCopyState->m_msgWindow->GetTransactionManager(getter_AddRefs(txnMgr));
+      if (txnMgr)
+        txnMgr->DoTransaction(mCopyState->m_undoMsgTxn);
+    }
+    (void) OnCopyCompleted(mCopyState->m_srcSupport, NS_SUCCEEDED(rv) ? true : false);  //clear the copy state so that the next message from a different folder can be move
+  }
+
+  return NS_OK;
+
+}
+
+// this is the beginning of the next message copied
+NS_IMETHODIMP nsMsgLocalMailFolder::StartMessage()
+{
+  // We get crashes that we don't understand (bug 284876), so stupidly prevent that.
+  NS_ENSURE_ARG_POINTER(mCopyState);
+  nsresult rv = InitCopyMsgHdrAndFileStream();
+  NS_ENSURE_SUCCESS(rv, rv);
+  return WriteStartOfNewMessage();
+}
+
+// just finished the current message.
+NS_IMETHODIMP nsMsgLocalMailFolder::EndMessage(nsMsgKey key)
+{
+  NS_ENSURE_ARG_POINTER(mCopyState);
+
+  RefPtr<nsLocalMoveCopyMsgTxn> localUndoTxn = mCopyState->m_undoMsgTxn;
+  nsCOMPtr<nsIMsgWindow> msgWindow;
+  nsresult rv;
+
+  if (localUndoTxn)
+  {
+    localUndoTxn->GetMsgWindow(getter_AddRefs(msgWindow));
+    localUndoTxn->AddSrcKey(key);
+    localUndoTxn->AddDstKey(mCopyState->m_curDstKey);
+  }
+
+  // I think this is always true for online to offline copy
+  mCopyState->m_dummyEnvelopeNeeded = true;
+  nsCOMPtr <nsISeekableStream> seekableStream = do_QueryInterface(mCopyState->m_fileStream, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+  seekableStream->Seek(nsISeekableStream::NS_SEEK_END, 0);
+  uint32_t bytesWritten;
+  mCopyState->m_fileStream->Write(MSG_LINEBREAK, MSG_LINEBREAK_LEN, &bytesWritten);
+  if (mCopyState->m_parseMsgState)
+    mCopyState->m_parseMsgState->ParseAFolderLine(CRLF, MSG_LINEBREAK_LEN);
+
+  rv = mCopyState->m_msgStore->FinishNewMessage(mCopyState->m_fileStream,
+                                                mCopyState->m_newHdr);
+  mCopyState->m_fileStream->Close();
+  mCopyState->m_fileStream = nullptr; // all done with the file stream
+
+  // CopyFileMessage() and CopyMessages() from servers other than mailbox
+  if (mCopyState->m_parseMsgState)
+  {
+    nsCOMPtr<nsIMsgDatabase> msgDb;
+    nsCOMPtr<nsIMsgDBHdr> newHdr;
+
+    mCopyState->m_parseMsgState->FinishHeader();
+
+    rv = mCopyState->m_parseMsgState->GetNewMsgHdr(getter_AddRefs(newHdr));
+    if (NS_SUCCEEDED(rv) && newHdr)
+    {
+      nsCOMPtr<nsIMsgFolder> srcFolder = do_QueryInterface(mCopyState->m_srcSupport, &rv);
+      NS_ENSURE_SUCCESS(rv, rv);
+      nsCOMPtr<nsIMsgDatabase> srcDB;
+      srcFolder->GetMsgDatabase(getter_AddRefs(srcDB));
+      if (srcDB)
+      {
+        nsCOMPtr <nsIMsgDBHdr> srcMsgHdr;
+        srcDB->GetMsgHdrForKey(key, getter_AddRefs(srcMsgHdr));
+        if (srcMsgHdr)
+          CopyPropertiesToMsgHdr(newHdr, srcMsgHdr, mCopyState->m_isMove);
+      }
+      rv = GetDatabaseWOReparse(getter_AddRefs(msgDb));
+      if (NS_SUCCEEDED(rv) && msgDb)
+      {
+        msgDb->AddNewHdrToDB(newHdr, true);
+        if (localUndoTxn)
+        {
+          // ** jt - recording the message size for possible undo use; the
+          // message size is different for pop3 and imap4 messages
+          uint32_t msgSize;
+          newHdr->GetMessageSize(&msgSize);
+          localUndoTxn->AddDstMsgSize(msgSize);
+        }
+      }
+      else
+        mCopyState->m_undoMsgTxn = nullptr; //null out the transaction because we can't undo w/o the msg db
+    }
+    mCopyState->m_parseMsgState->Clear();
+
+    if (mCopyState->m_listener) // CopyFileMessage() only
+      mCopyState->m_listener->SetMessageKey(mCopyState->m_curDstKey);
+  }
+
+  if (mCopyState->m_fileStream)
+    mCopyState->m_fileStream->Flush();
+  return NS_OK;
+}
+
+
+nsresult nsMsgLocalMailFolder::CopyMessagesTo(nsIArray *messages, nsTArray<nsMsgKey> &keyArray,
+                                             nsIMsgWindow *aMsgWindow, nsIMsgFolder *dstFolder,
+                                             bool isMove)
+{
+  if (!mCopyState)
+    return NS_ERROR_OUT_OF_MEMORY;
+
+  nsresult rv;
+
+  nsCOMPtr<nsICopyMessageStreamListener> copyStreamListener = do_CreateInstance(NS_COPYMESSAGESTREAMLISTENER_CONTRACTID, &rv);
+  NS_ENSURE_SUCCESS(rv,rv);
+
+  nsCOMPtr<nsICopyMessageListener> copyListener(do_QueryInterface(dstFolder, &rv));
+  NS_ENSURE_SUCCESS(rv, NS_ERROR_NO_INTERFACE);
+
+  nsCOMPtr<nsIMsgFolder> srcFolder(do_QueryInterface(mCopyState->m_srcSupport, &rv));
+  NS_ENSURE_SUCCESS(rv, NS_ERROR_NO_INTERFACE);
+
+  rv = copyStreamListener->Init(srcFolder, copyListener, nullptr);
+  if (NS_FAILED(rv))
+    return rv;
+
+  if (!mCopyState->m_messageService)
+  {
+    nsCString uri;
+    srcFolder->GetURI(uri);
+    rv = GetMessageServiceFromURI(uri, getter_AddRefs(mCopyState->m_messageService));
+  }
+
+  if (NS_SUCCEEDED(rv) && mCopyState->m_messageService)
+  {
+    nsCOMPtr<nsIStreamListener> streamListener(do_QueryInterface(copyStreamListener, &rv));
+    NS_ENSURE_SUCCESS(rv, NS_ERROR_NO_INTERFACE);
+
+    mCopyState->m_curCopyIndex = 0;
+    // we need to kick off the first message - subsequent messages
+    // are kicked off by nsMailboxProtocol when it finishes a message
+    // before starting the next message. Only do this if the source folder
+    // is a local folder, however. IMAP will handle calling StartMessage for
+    // each message that gets downloaded, and news doesn't go through here
+    // because news only downloads one message at a time, and this routine
+    // is for multiple message copy.
+    nsCOMPtr <nsIMsgLocalMailFolder> srcLocalFolder = do_QueryInterface(srcFolder);
+    if (srcLocalFolder)
+      StartMessage();
+    nsCOMPtr<nsIURI> dummyNull;
+    rv = mCopyState->m_messageService->CopyMessages(keyArray.Length(),
+                                                    keyArray.Elements(),
+                                                    srcFolder, streamListener,
+                                                    isMove, nullptr, aMsgWindow,
+                                                    getter_AddRefs(dummyNull));
+  }
+  return rv;
+}
+
+nsresult nsMsgLocalMailFolder::CopyMessageTo(nsISupports *message,
+                                             nsIMsgFolder *dstFolder /* dst same as "this" */,
+                                             nsIMsgWindow *aMsgWindow,
+                                             bool isMove)
+{
+  if (!mCopyState)
+    return NS_ERROR_OUT_OF_MEMORY;
+
+  nsresult rv;
+  nsCOMPtr<nsIMsgDBHdr> msgHdr(do_QueryInterface(message, &rv));
+  NS_ENSURE_SUCCESS(rv, NS_ERROR_NO_INTERFACE);
+
+  mCopyState->m_message = do_QueryInterface(msgHdr, &rv);
+
+  nsCOMPtr<nsIMsgFolder> srcFolder(do_QueryInterface(mCopyState->m_srcSupport, &rv));
+  NS_ENSURE_SUCCESS(rv, NS_ERROR_NO_INTERFACE);
+  nsCString uri;
+  srcFolder->GetUriForMsg(msgHdr, uri);
+
+  nsCOMPtr<nsICopyMessageStreamListener> copyStreamListener = do_CreateInstance(NS_COPYMESSAGESTREAMLISTENER_CONTRACTID, &rv);
+  NS_ENSURE_SUCCESS(rv,rv);
+
+  nsCOMPtr<nsICopyMessageListener> copyListener(do_QueryInterface(dstFolder, &rv));
+  NS_ENSURE_SUCCESS(rv, NS_ERROR_NO_INTERFACE);
+
+  rv = copyStreamListener->Init(srcFolder, copyListener, nullptr);
+  if (NS_FAILED(rv))
+    return rv;
+
+  if (!mCopyState->m_messageService)
+    rv = GetMessageServiceFromURI(uri, getter_AddRefs(mCopyState->m_messageService));
+
+  if (NS_SUCCEEDED(rv) && mCopyState->m_messageService)
+  {
+    nsCOMPtr<nsIStreamListener> streamListener(do_QueryInterface(copyStreamListener, &rv));
+    NS_ENSURE_SUCCESS(rv, NS_ERROR_NO_INTERFACE);
+    nsCOMPtr<nsIURI> dummyNull;
+    rv = mCopyState->m_messageService->CopyMessage(uri.get(), streamListener, isMove, nullptr, aMsgWindow,
+                                                   getter_AddRefs(dummyNull));
+  }
+  return rv;
+}
+
+// A message is being deleted from a POP3 mail file, so check and see if we have the message
+// being deleted in the server. If so, then we need to remove the message from the server as well.
+// We have saved the UIDL of the message in the popstate.dat file and we must match this uidl, so
+// read the message headers and see if we have it, then mark the message for deletion from the server.
+// The next time we look at mail the message will be deleted from the server.
+
+NS_IMETHODIMP
+nsMsgLocalMailFolder::MarkMsgsOnPop3Server(nsIArray *aMessages, int32_t aMark)
+{
+  nsLocalFolderScanState folderScanState;
+  nsCOMPtr<nsIPop3IncomingServer> curFolderPop3MailServer;
+  nsCOMArray<nsIPop3IncomingServer> pop3Servers; // servers with msgs deleted...
+
+  nsCOMPtr<nsIMsgIncomingServer> incomingServer;
+  nsresult rv = GetServer(getter_AddRefs(incomingServer));
+  NS_ENSURE_SUCCESS(rv, NS_MSG_INVALID_OR_MISSING_SERVER);
+
+  nsCOMPtr <nsIMsgAccountManager> accountManager = do_GetService(NS_MSGACCOUNTMANAGER_CONTRACTID, &rv);
+  NS_ENSURE_SUCCESS(rv,rv);
+
+  // I wonder if we should run through the pop3 accounts and see if any of them have
+  // leave on server set. If not, we could short-circuit some of this.
+
+  curFolderPop3MailServer = do_QueryInterface(incomingServer, &rv);
+  rv = GetFolderScanState(&folderScanState);
+  NS_ENSURE_SUCCESS(rv,rv);
+
+  uint32_t srcCount;
+  aMessages->GetLength(&srcCount);
+
+  // Filter delete requests are always honored, others are subject
+  // to the deleteMailLeftOnServer preference.
+  int32_t mark;
+  mark = (aMark == POP3_FORCE_DEL) ? POP3_DELETE : aMark;
+
+  for (uint32_t i = 0; i < srcCount; i++)
+  {
+    /* get uidl for this message */
+    nsCOMPtr<nsIMsgDBHdr> msgDBHdr (do_QueryElementAt(aMessages, i, &rv));
+
+    uint32_t flags = 0;
+
+    if (msgDBHdr)
+    {
+      msgDBHdr->GetFlags(&flags);
+      nsCOMPtr <nsIPop3IncomingServer> msgPop3Server = curFolderPop3MailServer;
+      bool leaveOnServer = false;
+      bool deleteMailLeftOnServer = false;
+      // set up defaults, in case there's no x-mozilla-account header
+      if (curFolderPop3MailServer)
+      {
+        curFolderPop3MailServer->GetDeleteMailLeftOnServer(&deleteMailLeftOnServer);
+        curFolderPop3MailServer->GetLeaveMessagesOnServer(&leaveOnServer);
+      }
+
+      rv = GetUidlFromFolder(&folderScanState, msgDBHdr);
+      if (!NS_SUCCEEDED(rv))
+        continue;
+
+      if (folderScanState.m_uidl)
+      {
+        nsCOMPtr <nsIMsgAccount> account;
+        rv = accountManager->GetAccount(folderScanState.m_accountKey, getter_AddRefs(account));
+        if (NS_SUCCEEDED(rv) && account)
+        {
+          account->GetIncomingServer(getter_AddRefs(incomingServer));
+          nsCOMPtr<nsIPop3IncomingServer> curMsgPop3MailServer = do_QueryInterface(incomingServer);
+          if (curMsgPop3MailServer)
+          {
+            msgPop3Server = curMsgPop3MailServer;
+            msgPop3Server->GetDeleteMailLeftOnServer(&deleteMailLeftOnServer);
+            msgPop3Server->GetLeaveMessagesOnServer(&leaveOnServer);
+          }
+        }
+      }
+      // ignore this header if not partial and leaveOnServer not set...
+      // or if we can't find the pop3 server.
+      if (!msgPop3Server || (! (flags & nsMsgMessageFlags::Partial) && !leaveOnServer))
+        continue;
+      // if marking deleted, ignore header if we're not deleting from
+      // server when deleting locally.
+      if (aMark == POP3_DELETE && leaveOnServer && !deleteMailLeftOnServer)
+        continue;
+      if (folderScanState.m_uidl)
+      {
+        msgPop3Server->AddUidlToMark(folderScanState.m_uidl, mark);
+        // remember this pop server in list of servers with msgs deleted
+        if (pop3Servers.IndexOfObject(msgPop3Server) == -1)
+          pop3Servers.AppendObject(msgPop3Server);
+      }
+    }
+  }
+  if (folderScanState.m_inputStream)
+    folderScanState.m_inputStream->Close();
+  // need to do this for all pop3 mail servers that had messages deleted.
+  uint32_t serverCount = pop3Servers.Count();
+  for (uint32_t index = 0; index < serverCount; index++)
+    pop3Servers[index]->MarkMessages();
+
+  return rv;
+}
+
+NS_IMETHODIMP nsMsgLocalMailFolder::DeleteDownloadMsg(nsIMsgDBHdr *aMsgHdr, bool *aDoSelect)
+{
+  uint32_t numMsgs;
+  char *newMsgId;
+
+  // This method is only invoked thru DownloadMessagesForOffline()
+  if (mDownloadState != DOWNLOAD_STATE_NONE)
+  {
+    // We only remember the first key, no matter how many
+    // messages were originally selected.
+    if (mDownloadState == DOWNLOAD_STATE_INITED)
+    {
+      aMsgHdr->GetMessageKey(&mDownloadSelectKey);
+      mDownloadState = DOWNLOAD_STATE_GOTMSG;
+    }
+
+    aMsgHdr->GetMessageId(&newMsgId);
+
+    // Walk through all the selected headers, looking for a matching
+    // Message-ID.
+    numMsgs = mDownloadMessages.Length();
+    for (uint32_t i = 0; i < numMsgs; i++)
+    {
+      nsresult rv;
+      nsCOMPtr<nsIMsgDBHdr> msgDBHdr = mDownloadMessages[i];
+      char *oldMsgId = nullptr;
+      msgDBHdr->GetMessageId(&oldMsgId);
+
+      // Delete the first match and remove it from the array
+      if (!PL_strcmp(newMsgId, oldMsgId))
+      {
+        rv = GetDatabase();
+        if (!mDatabase)
+          return rv;
+
+        UpdateNewMsgHdr(msgDBHdr, aMsgHdr);
+
+#if DOWNLOAD_NOTIFY_STYLE == DOWNLOAD_NOTIFY_LAST
+        msgDBHdr->GetMessageKey(&mDownloadOldKey);
+        msgDBHdr->GetThreadParent(&mDownloadOldParent);
+        msgDBHdr->GetFlags(&mDownloadOldFlags);
+        mDatabase->DeleteHeader(msgDBHdr, nullptr, false, false);
+        // Tell caller we want to select this message
+        if (aDoSelect)
+          *aDoSelect = true;
+#else
+        mDatabase->DeleteHeader(msgDBHdr, nullptr, false, true);
+        // Tell caller we want to select this message
+        if (aDoSelect && mDownloadState == DOWNLOAD_STATE_GOTMSG)
+          *aDoSelect = true;
+#endif
+        mDownloadMessages.RemoveElementAt(i);
+        break;
+      }
+    }
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsMsgLocalMailFolder::SelectDownloadMsg()
+{
+#if DOWNLOAD_NOTIFY_STYLE == DOWNLOAD_NOTIFY_LAST
+  if (mDownloadState >= DOWNLOAD_STATE_GOTMSG)
+  {
+    nsresult rv = GetDatabase();
+    if (!mDatabase)
+      return rv;
+    }
+    mDatabase->NotifyKeyDeletedAll(mDownloadOldKey, mDownloadOldParent, mDownloadOldFlags, nullptr);
+  }
+#endif
+
+  if (mDownloadState == DOWNLOAD_STATE_GOTMSG && mDownloadWindow)
+  {
+    nsAutoCString newuri;
+    nsBuildLocalMessageURI(mBaseMessageURI.get(), mDownloadSelectKey, newuri);
+    nsCOMPtr<nsIMsgWindowCommands> windowCommands;
+    mDownloadWindow->GetWindowCommands(getter_AddRefs(windowCommands));
+    if (windowCommands)
+      windowCommands->SelectMessage(newuri);
+    mDownloadState = DOWNLOAD_STATE_DIDSEL;
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsMsgLocalMailFolder::DownloadMessagesForOffline(nsIArray *aMessages, nsIMsgWindow *aWindow)
+{
+  if (mDownloadState != DOWNLOAD_STATE_NONE)
+    return NS_ERROR_FAILURE; // already has a download in progress
+
+  // We're starting a download...
+  mDownloadState = DOWNLOAD_STATE_INITED;
+
+  MarkMsgsOnPop3Server(aMessages, POP3_FETCH_BODY);
+
+  // Pull out all the PARTIAL messages into a new array
+  uint32_t srcCount;
+  aMessages->GetLength(&srcCount);
+
+  nsresult rv;
+  for (uint32_t i = 0; i < srcCount; i++)
+  {
+    nsCOMPtr<nsIMsgDBHdr> msgDBHdr (do_QueryElementAt(aMessages, i, &rv));
+    if (NS_SUCCEEDED(rv))
+    {
+      uint32_t flags = 0;
+      msgDBHdr->GetFlags(&flags);
+      if (flags & nsMsgMessageFlags::Partial)
+        mDownloadMessages.AppendElement(msgDBHdr);
+    }
+  }
+  mDownloadWindow = aWindow;
+
+  nsCOMPtr<nsIMsgIncomingServer> server;
+  rv = GetServer(getter_AddRefs(server));
+  NS_ENSURE_SUCCESS(rv, NS_MSG_INVALID_OR_MISSING_SERVER);
+
+  nsCOMPtr<nsILocalMailIncomingServer> localMailServer = do_QueryInterface(server, &rv);
+  NS_ENSURE_SUCCESS(rv, NS_MSG_INVALID_OR_MISSING_SERVER);
+  return localMailServer->GetNewMail(aWindow, this, this, nullptr);
+}
+
+NS_IMETHODIMP nsMsgLocalMailFolder::NotifyDelete()
+{
+  NotifyFolderEvent(mDeleteOrMoveMsgCompletedAtom);
+  return NS_OK;
+}
+
+// TODO:  once we move certain code into the IncomingServer (search for TODO)
+// this method will go away.
+// sometimes this gets called when we don't have the server yet, so
+// that's why we're not calling GetServer()
+NS_IMETHODIMP
+nsMsgLocalMailFolder::GetIncomingServerType(nsACString& aServerType)
+{
+  nsresult rv;
+  if (mType.IsEmpty())
+  {
+    nsCOMPtr<nsIURL> url = do_CreateInstance(NS_STANDARDURL_CONTRACTID, &rv);
+    if (NS_FAILED(rv))
+      return rv;
+
+    rv = url->SetSpec(mURI);
+    if (NS_FAILED(rv))
+      return rv;
+
+    nsCOMPtr<nsIMsgAccountManager> accountManager =
+             do_GetService(NS_MSGACCOUNTMANAGER_CONTRACTID, &rv);
+    if (NS_FAILED(rv))
+      return rv;
+
+    nsCOMPtr<nsIMsgIncomingServer> server;
+    // try "none" first
+    url->SetScheme(NS_LITERAL_CSTRING("none"));
+    rv = accountManager->FindServerByURI(url, false, getter_AddRefs(server));
+    if (NS_SUCCEEDED(rv) && server)
+      mType.AssignLiteral("none");
+    else
+    {
+      // next try "pop3"
+      url->SetScheme(NS_LITERAL_CSTRING("pop3"));
+      rv = accountManager->FindServerByURI(url, false, getter_AddRefs(server));
+      if (NS_SUCCEEDED(rv) && server)
+        mType.AssignLiteral("pop3");
+      else
+      {
+        // next try "rss"
+        url->SetScheme(NS_LITERAL_CSTRING("rss"));
+        rv = accountManager->FindServerByURI(url, false, getter_AddRefs(server));
+        if (NS_SUCCEEDED(rv) && server)
+          mType.AssignLiteral("rss");
+        else
+        {
+#ifdef HAVE_MOVEMAIL
+          // next try "movemail"
+          url->SetScheme(NS_LITERAL_CSTRING("movemail"));
+          rv = accountManager->FindServerByURI(url, false, getter_AddRefs(server));
+          if (NS_SUCCEEDED(rv) && server)
+            mType.AssignLiteral("movemail");
+#endif /* HAVE_MOVEMAIL */
+        }
+      }
+    }
+  }
+  aServerType = mType;
+  return NS_OK;
+}
+
+nsresult nsMsgLocalMailFolder::CreateBaseMessageURI(const nsACString& aURI)
+{
+  return nsCreateLocalBaseMessageURI(aURI, mBaseMessageURI);
+}
+
+NS_IMETHODIMP
+nsMsgLocalMailFolder::OnStartRunningUrl(nsIURI * aUrl)
+{
+  nsresult rv;
+  nsCOMPtr<nsIPop3URL> popurl = do_QueryInterface(aUrl, &rv);
+  if (NS_SUCCEEDED(rv))
+  {
+    nsAutoCString aSpec;
+    rv = aUrl->GetSpec(aSpec);
+    NS_ENSURE_SUCCESS(rv, rv);
+    if (strstr(aSpec.get(), "uidl="))
+    {
+      nsCOMPtr<nsIPop3Sink> popsink;
+      rv = popurl->GetPop3Sink(getter_AddRefs(popsink));
+      if (NS_SUCCEEDED(rv))
+      {
+        popsink->SetBaseMessageUri(mBaseMessageURI.get());
+        nsCString messageuri;
+        popurl->GetMessageUri(getter_Copies(messageuri));
+        popsink->SetOrigMessageUri(messageuri);
+      }
+    }
+  }
+  return nsMsgDBFolder::OnStartRunningUrl(aUrl);
+}
+
+NS_IMETHODIMP
+nsMsgLocalMailFolder::OnStopRunningUrl(nsIURI * aUrl, nsresult aExitCode)
+{
+  // If we just finished a DownloadMessages call, reset...
+  if (mDownloadState != DOWNLOAD_STATE_NONE)
+  {
+    mDownloadState = DOWNLOAD_STATE_NONE;
+    mDownloadMessages.Clear();
+    mDownloadWindow = nullptr;
+    return nsMsgDBFolder::OnStopRunningUrl(aUrl, aExitCode);
+  }
+
+  nsresult rv;
+  if (NS_SUCCEEDED(aExitCode))
+  {
+    nsCOMPtr<nsIMsgMailSession> mailSession = do_GetService(NS_MSGMAILSESSION_CONTRACTID, &rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+    nsCOMPtr<nsIMsgWindow> msgWindow;
+    rv = mailSession->GetTopmostMsgWindow(getter_AddRefs(msgWindow));
+    nsAutoCString aSpec;
+    if (aUrl) {
+      rv = aUrl->GetSpec(aSpec);
+      NS_ENSURE_SUCCESS(rv, rv);
+    }
+
+    if (strstr(aSpec.get(), "uidl="))
+    {
+      nsCOMPtr<nsIPop3URL> popurl = do_QueryInterface(aUrl, &rv);
+      if (NS_SUCCEEDED(rv))
+      {
+        nsCString messageuri;
+        rv = popurl->GetMessageUri(getter_Copies(messageuri));
+        if (NS_SUCCEEDED(rv))
+        {
+          NS_ENSURE_SUCCESS(rv, rv);
+          nsCOMPtr <nsIMsgDBHdr> msgDBHdr;
+          rv = GetMsgDBHdrFromURI(messageuri.get(), getter_AddRefs(msgDBHdr));
+          if (NS_SUCCEEDED(rv))
+          {
+            GetDatabase();
+            if (mDatabase)
+              mDatabase->DeleteHeader(msgDBHdr, nullptr, true, true);
+          }
+
+          nsCOMPtr<nsIPop3Sink> pop3sink;
+          nsCString newMessageUri;
+          rv = popurl->GetPop3Sink(getter_AddRefs(pop3sink));
+          if (NS_SUCCEEDED(rv))
+          {
+            pop3sink->GetMessageUri(getter_Copies(newMessageUri));
+            if (msgWindow)
+            {
+              nsCOMPtr<nsIMsgWindowCommands> windowCommands;
+              msgWindow->GetWindowCommands(getter_AddRefs(windowCommands));
+              if (windowCommands)
+                windowCommands->SelectMessage(newMessageUri);
+            }
+          }
+        }
+      }
+    }
+
+    if (mFlags & nsMsgFolderFlags::Inbox)
+    {
+      if (mDatabase && mCheckForNewMessagesAfterParsing)
+      {
+        bool valid = false; // GetSummaryValid may return without setting valid.
+        mDatabase->GetSummaryValid(&valid);
+        if (valid && msgWindow)
+          rv = GetNewMessages(msgWindow, nullptr);
+        mCheckForNewMessagesAfterParsing = false;
+      }
+    }
+  }
+
+  if (m_parsingFolder)
+  {
+    // Clear this before calling OnStopRunningUrl, in case the url listener
+    // tries to get the database.
+    m_parsingFolder = false;
+
+    // TODO: Updating the size should be pushed down into the msg store backend
+    // so that the size is recalculated as part of parsing the folder data
+    // (important for maildir), once GetSizeOnDisk is pushed into the msgStores
+    // (bug 1032360).
+    (void)RefreshSizeOnDisk();
+
+    // Update the summary totals so the front end will
+    // show the right thing.
+    UpdateSummaryTotals(true);
+
+    if (mReparseListener)
+    {
+      nsCOMPtr<nsIUrlListener> saveReparseListener = mReparseListener;
+      mReparseListener = nullptr;
+      saveReparseListener->OnStopRunningUrl(aUrl, aExitCode);
+    }
+  }
+  if (mFlags & nsMsgFolderFlags::Inbox)
+  {
+    // if we are the inbox and running pop url
+    nsCOMPtr<nsIPop3URL> popurl = do_QueryInterface(aUrl, &rv);
+    if (NS_SUCCEEDED(rv))
+    {
+      nsCOMPtr<nsIMsgIncomingServer> server;
+      GetServer(getter_AddRefs(server));
+      // this is the deferred to account, in the global inbox case
+      if (server)
+        server->SetPerformingBiff(false);  //biff is over
+    }
+  }
+  return nsMsgDBFolder::OnStopRunningUrl(aUrl, aExitCode);
+}
+
+nsresult nsMsgLocalMailFolder::DisplayMoveCopyStatusMsg()
+{
+  nsresult rv = NS_OK;
+  if (mCopyState)
+  {
+    if (!mCopyState->m_statusFeedback)
+    {
+      // get msgWindow from undo txn
+      nsCOMPtr<nsIMsgWindow> msgWindow;
+      if (mCopyState->m_undoMsgTxn)
+        mCopyState->m_undoMsgTxn->GetMsgWindow(getter_AddRefs(msgWindow));
+      if (!msgWindow)
+        return NS_OK; // not a fatal error.
+
+      msgWindow->GetStatusFeedback(getter_AddRefs(mCopyState->m_statusFeedback));
+    }
+
+    if (!mCopyState->m_stringBundle)
+    {
+      nsCOMPtr<nsIStringBundleService> bundleService =
+        mozilla::services::GetStringBundleService();
+      NS_ENSURE_TRUE(bundleService, NS_ERROR_UNEXPECTED);
+      rv = bundleService->CreateBundle("chrome://messenger/locale/localMsgs.properties", getter_AddRefs(mCopyState->m_stringBundle));
+      NS_ENSURE_SUCCESS(rv, rv);
+    }
+    if (mCopyState->m_statusFeedback && mCopyState->m_stringBundle)
+    {
+      nsString folderName;
+      GetName(folderName);
+      nsAutoString numMsgSoFarString;
+      numMsgSoFarString.AppendInt((mCopyState->m_copyingMultipleMessages) ? mCopyState->m_curCopyIndex : 1);
+
+      nsAutoString totalMessagesString;
+      totalMessagesString.AppendInt(mCopyState->m_totalMsgCount);
+      nsString finalString;
+      const char16_t * stringArray[] = { numMsgSoFarString.get(), totalMessagesString.get(), folderName.get() };
+      rv = mCopyState->m_stringBundle->FormatStringFromName(
+        (mCopyState->m_isMove) ?
+        u"movingMessagesStatus" :
+        u"copyingMessagesStatus",
+        stringArray, 3, getter_Copies(finalString));
+      int64_t nowMS = PR_IntervalToMilliseconds(PR_IntervalNow());
+
+      // only update status/progress every half second
+      if (nowMS - mCopyState->m_lastProgressTime < 500 &&
+          mCopyState->m_curCopyIndex < mCopyState->m_totalMsgCount)
+        return NS_OK;
+
+      mCopyState->m_lastProgressTime = nowMS;
+      mCopyState->m_statusFeedback->ShowStatusString(finalString);
+      mCopyState->m_statusFeedback->ShowProgress(mCopyState->m_curCopyIndex * 100 / mCopyState->m_totalMsgCount);
+    }
+  }
+  return rv;
+}
+
+NS_IMETHODIMP
+nsMsgLocalMailFolder::SetFlagsOnDefaultMailboxes(uint32_t flags)
+{
+  if (flags & nsMsgFolderFlags::Inbox)
+    setSubfolderFlag(NS_LITERAL_STRING("Inbox"), nsMsgFolderFlags::Inbox);
+
+  if (flags & nsMsgFolderFlags::SentMail)
+    setSubfolderFlag(NS_LITERAL_STRING("Sent"), nsMsgFolderFlags::SentMail);
+
+  if (flags & nsMsgFolderFlags::Drafts)
+    setSubfolderFlag(NS_LITERAL_STRING("Drafts"), nsMsgFolderFlags::Drafts);
+
+  if (flags & nsMsgFolderFlags::Templates)
+    setSubfolderFlag(NS_LITERAL_STRING("Templates"), nsMsgFolderFlags::Templates);
+
+  if (flags & nsMsgFolderFlags::Trash)
+    setSubfolderFlag(NS_LITERAL_STRING("Trash"), nsMsgFolderFlags::Trash);
+
+  if (flags & nsMsgFolderFlags::Queue)
+    setSubfolderFlag(NS_LITERAL_STRING("Unsent Messages"), nsMsgFolderFlags::Queue);
+
+  if (flags & nsMsgFolderFlags::Junk)
+    setSubfolderFlag(NS_LITERAL_STRING("Junk"), nsMsgFolderFlags::Junk);
+
+  if (flags & nsMsgFolderFlags::Archive)
+    setSubfolderFlag(NS_LITERAL_STRING("Archives"), nsMsgFolderFlags::Archive);
+
+  return NS_OK;
+}
+
+nsresult
+nsMsgLocalMailFolder::setSubfolderFlag(const nsAString& aFolderName, uint32_t flags)
+{
+  // FindSubFolder() expects the folder name to be escaped
+  // see bug #192043
+  nsAutoCString escapedFolderName;
+  nsresult rv = NS_MsgEscapeEncodeURLPath(aFolderName, escapedFolderName);
+  NS_ENSURE_SUCCESS(rv,rv);
+  nsCOMPtr<nsIMsgFolder> msgFolder;
+  rv = FindSubFolder(escapedFolderName, getter_AddRefs(msgFolder));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // we only want to do this if the folder *really* exists,
+  // so check if it has a parent. Otherwise, we'll create the
+  // .msf file when we don't want to.
+  nsCOMPtr <nsIMsgFolder> parent;
+  msgFolder->GetParent(getter_AddRefs(parent));
+  if (!parent)
+    return NS_ERROR_FAILURE;
+
+  rv = msgFolder->SetFlag(flags);
+  NS_ENSURE_SUCCESS(rv, rv);
+  return msgFolder->SetPrettyName(aFolderName);
+}
+
+NS_IMETHODIMP
+nsMsgLocalMailFolder::GetCheckForNewMessagesAfterParsing(bool *aCheckForNewMessagesAfterParsing)
+{
+  NS_ENSURE_ARG_POINTER(aCheckForNewMessagesAfterParsing);
+  *aCheckForNewMessagesAfterParsing = mCheckForNewMessagesAfterParsing;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsMsgLocalMailFolder::SetCheckForNewMessagesAfterParsing(bool aCheckForNewMessagesAfterParsing)
+{
+  mCheckForNewMessagesAfterParsing = aCheckForNewMessagesAfterParsing;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsMsgLocalMailFolder::NotifyCompactCompleted()
+{
+  mExpungedBytes = 0;
+  m_newMsgs.Clear(); // if compacted, m_newMsgs probably aren't valid.
+  // if compacted, processing flags probably also aren't valid.
+  ClearProcessingFlags();
+  (void) RefreshSizeOnDisk();
+  (void) CloseDBIfFolderNotOpen();
+  nsCOMPtr <nsIAtom> compactCompletedAtom;
+  compactCompletedAtom = MsgGetAtom("CompactCompleted");
+  NotifyFolderEvent(compactCompletedAtom);
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsMsgLocalMailFolder::Shutdown(bool shutdownChildren)
+{
+  mInitialized = false;
+  return nsMsgDBFolder::Shutdown(shutdownChildren);
+}
+
+NS_IMETHODIMP
+nsMsgLocalMailFolder::OnMessageClassified(const char *aMsgURI,
+  nsMsgJunkStatus aClassification,
+  uint32_t aJunkPercent)
+
+{
+  nsCOMPtr<nsIMsgIncomingServer> server;
+  nsresult rv = GetServer(getter_AddRefs(server));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsISpamSettings> spamSettings;
+  rv = server->GetSpamSettings(getter_AddRefs(spamSettings));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCString spamFolderURI;
+  rv = spamSettings->GetSpamFolderURI(getter_Copies(spamFolderURI));
+  NS_ENSURE_SUCCESS(rv,rv);
+
+  if (aMsgURI) // not end of batch
+  {
+    nsCOMPtr <nsIMsgDBHdr> msgHdr;
+    rv = GetMsgDBHdrFromURI(aMsgURI, getter_AddRefs(msgHdr));
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    nsMsgKey msgKey;
+    rv = msgHdr->GetMessageKey(&msgKey);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    // check if this message needs junk classification
+    uint32_t processingFlags;
+    GetProcessingFlags(msgKey, &processingFlags);
+
+    if (processingFlags & nsMsgProcessingFlags::ClassifyJunk)
+    {
+      nsMsgDBFolder::OnMessageClassified(aMsgURI, aClassification, aJunkPercent);
+
+      if (aClassification == nsIJunkMailPlugin::JUNK)
+      {
+        bool willMoveMessage = false;
+
+        // don't do the move when we are opening up
+        // the junk mail folder or the trash folder
+        // or when manually classifying messages in those folders
+        if (!(mFlags & nsMsgFolderFlags::Junk || mFlags & nsMsgFolderFlags::Trash))
+        {
+          bool moveOnSpam = false;
+          rv = spamSettings->GetMoveOnSpam(&moveOnSpam);
+          NS_ENSURE_SUCCESS(rv,rv);
+          if (moveOnSpam)
+          {
+            nsCOMPtr<nsIMsgFolder> folder;
+            rv = GetExistingFolder(spamFolderURI, getter_AddRefs(folder));
+            if (NS_SUCCEEDED(rv) && folder)
+            {
+              rv = folder->SetFlag(nsMsgFolderFlags::Junk);
+              NS_ENSURE_SUCCESS(rv,rv);
+              mSpamKeysToMove.AppendElement(msgKey);
+              willMoveMessage = true;
+            }
+            else
+            {
+              // XXX TODO
+              // JUNK MAIL RELATED
+              // the listener should do
+              // rv = folder->SetFlag(nsMsgFolderFlags::Junk);
+              // NS_ENSURE_SUCCESS(rv,rv);
+              // mSpamKeysToMove.AppendElement(msgKey);
+              // willMoveMessage = true;
+              rv = GetOrCreateFolder(spamFolderURI, nullptr /* aListener */);
+              NS_ASSERTION(NS_SUCCEEDED(rv), "GetOrCreateFolder failed");
+            }
+          }
+        }
+        rv = spamSettings->LogJunkHit(msgHdr, willMoveMessage);
+        NS_ENSURE_SUCCESS(rv,rv);
+      }
+    }
+  }
+
+  else // end of batch
+  {
+    // Parent will apply post bayes filters.
+    nsMsgDBFolder::OnMessageClassified(nullptr, nsIJunkMailPlugin::UNCLASSIFIED, 0);
+    nsCOMPtr<nsIMutableArray> messages(do_CreateInstance(NS_ARRAY_CONTRACTID));
+    if (!mSpamKeysToMove.IsEmpty())
+    {
+      nsCOMPtr<nsIMsgFolder> folder;
+      if (!spamFolderURI.IsEmpty())
+        rv = GetExistingFolder(spamFolderURI, getter_AddRefs(folder));
+      for (uint32_t keyIndex = 0; keyIndex < mSpamKeysToMove.Length(); keyIndex++)
+      {
+        // If an upstream filter moved this message, don't move it here.
+        nsMsgKey msgKey = mSpamKeysToMove.ElementAt(keyIndex);
+        nsMsgProcessingFlagType processingFlags;
+        GetProcessingFlags(msgKey, &processingFlags);
+        if (folder && !(processingFlags & nsMsgProcessingFlags::FilterToMove))
+        {
+          nsCOMPtr<nsIMsgDBHdr> mailHdr;
+          rv = GetMessageHeader(msgKey, getter_AddRefs(mailHdr));
+          if (NS_SUCCEEDED(rv) && mailHdr)
+            messages->AppendElement(mailHdr, false);
+        }
+        else
+        {
+          // We don't need the processing flag any more.
+          AndProcessingFlags(msgKey, ~nsMsgProcessingFlags::FilterToMove);
+        }
+      }
+
+      if (folder)
+      {
+        nsCOMPtr<nsIMsgCopyService> copySvc = do_GetService(NS_MSGCOPYSERVICE_CONTRACTID, &rv);
+        NS_ENSURE_SUCCESS(rv,rv);
+
+        rv = copySvc->CopyMessages(this, messages, folder, true,
+          /*nsIMsgCopyServiceListener* listener*/ nullptr, nullptr, false /*allowUndo*/);
+        NS_ASSERTION(NS_SUCCEEDED(rv), "CopyMessages failed");
+        if (NS_FAILED(rv))
+        {
+          nsAutoCString logMsg("failed to copy junk messages to junk folder rv = ");
+          logMsg.AppendInt(static_cast<uint32_t>(rv), 16);
+          spamSettings->LogJunkString(logMsg.get());
+        }
+      }
+    }
+    int32_t numNewMessages;
+    GetNumNewMessages(false, &numNewMessages);
+    uint32_t length;
+    messages->GetLength(&length);
+    SetNumNewMessages(numNewMessages - length);
+    mSpamKeysToMove.Clear();
+    // check if this is the inbox first...
+    if (mFlags & nsMsgFolderFlags::Inbox)
+      PerformBiffNotifications();
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsMsgLocalMailFolder::GetFolderScanState(nsLocalFolderScanState *aState)
+{
+  NS_ENSURE_ARG_POINTER(aState);
+
+  nsresult rv = GetMsgStore(getter_AddRefs(aState->m_msgStore));
+  NS_ENSURE_SUCCESS(rv, rv);
+    aState->m_uidl = nullptr;
+  return rv;
+}
+
+NS_IMETHODIMP
+nsMsgLocalMailFolder::GetUidlFromFolder(nsLocalFolderScanState *aState, nsIMsgDBHdr *aMsgDBHdr)
+{
+  bool more = false;
+  uint32_t size = 0, len = 0;
+  const char *accountKey = nullptr;
+  nsresult rv = GetMsgInputStream(aMsgDBHdr, &aState->m_streamReusable,
+                                  getter_AddRefs(aState->m_inputStream));
+  aState->m_seekableStream = do_QueryInterface(aState->m_inputStream);
+  NS_ENSURE_SUCCESS(rv,rv);
+
+  nsAutoPtr<nsLineBuffer<char> > lineBuffer(new nsLineBuffer<char>);
+  NS_ENSURE_TRUE(lineBuffer, NS_ERROR_OUT_OF_MEMORY);
+
+  aState->m_uidl = nullptr;
+
+  aMsgDBHdr->GetMessageSize(&len);
+  while (len > 0)
+  {
+    rv = NS_ReadLine(aState->m_inputStream.get(), lineBuffer.get(), aState->m_header, &more);
+    if (NS_SUCCEEDED(rv))
+    {
+      size = aState->m_header.Length();
+      if (!size)
+        break;
+      // this isn't quite right - need to account for line endings
+      len -= size;
+      // account key header will always be before X_UIDL header
+      if (!accountKey)
+      {
+        accountKey = strstr(aState->m_header.get(), HEADER_X_MOZILLA_ACCOUNT_KEY);
+        if (accountKey)
+        {
+          accountKey += strlen(HEADER_X_MOZILLA_ACCOUNT_KEY) + 2;
+          aState->m_accountKey = accountKey;
+        }
+      }
+      else
+      {
+        aState->m_uidl = strstr(aState->m_header.get(), X_UIDL);
+        if (aState->m_uidl)
+        {
+          aState->m_uidl += X_UIDL_LEN + 2; // skip UIDL: header
+          break;
+        }
+      }
+    }
+  }
+  if (!aState->m_streamReusable)
+  {
+    aState->m_inputStream->Close();
+    aState->m_inputStream = nullptr;
+  }
+  lineBuffer = nullptr;
+  return rv;
+}
+
+/**
+ * Adds a message to the end of the folder, parsing it as it goes, and
+ * applying filters, if applicable.
+ */
+NS_IMETHODIMP
+nsMsgLocalMailFolder::AddMessage(const char *aMessage, nsIMsgDBHdr **aHdr)
+{
+  const char *aMessages[] = {aMessage};
+  nsCOMPtr<nsIArray> hdrs;
+  nsresult rv = AddMessageBatch(1, aMessages, getter_AddRefs(hdrs));
+  NS_ENSURE_SUCCESS(rv, rv);
+  nsCOMPtr<nsIMsgDBHdr> hdr(do_QueryElementAt(hdrs, 0, &rv));
+  NS_ENSURE_SUCCESS(rv, rv);
+  hdr.forget(aHdr);
+  return rv;
+}
+
+NS_IMETHODIMP
+nsMsgLocalMailFolder::AddMessageBatch(uint32_t aMessageCount,
+                                      const char **aMessages,
+                                      nsIArray **aHdrArray)
+{
+  NS_ENSURE_ARG_POINTER(aHdrArray);
+
+  nsCOMPtr<nsIMsgIncomingServer> server;
+  nsresult rv = GetServer(getter_AddRefs(server));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsIMsgPluggableStore> msgStore;
+  nsCOMPtr <nsIOutputStream> outFileStream;
+  nsCOMPtr<nsIMsgDBHdr> newHdr;
+
+  rv = server->GetMsgStore(getter_AddRefs(msgStore));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsIMsgFolder> rootFolder;
+  rv = GetRootFolder(getter_AddRefs(rootFolder));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  bool isLocked;
+
+  GetLocked(&isLocked);
+  if (isLocked)
+    return NS_MSG_FOLDER_BUSY;
+
+  AcquireSemaphore(static_cast<nsIMsgLocalMailFolder*>(this));
+
+  if (NS_SUCCEEDED(rv))
+  {
+    nsCOMPtr<nsIMutableArray> hdrArray =
+      do_CreateInstance(NS_ARRAY_CONTRACTID, &rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+    for (uint32_t i = 0; i < aMessageCount; i++)
+    {
+      RefPtr<nsParseNewMailState> newMailParser = new nsParseNewMailState;
+      NS_ENSURE_TRUE(newMailParser, NS_ERROR_OUT_OF_MEMORY);
+      if (!mGettingNewMessages)
+        newMailParser->DisableFilters();
+      bool reusable;
+      rv = msgStore->GetNewMsgOutputStream(this, getter_AddRefs(newHdr),
+                                      &reusable,
+                                      getter_AddRefs(outFileStream));
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      // Get a msgWindow. Proceed without one, but filter actions to imap folders
+      // will silently fail if not signed in and no window for a prompt.
+      nsCOMPtr<nsIMsgWindow> msgWindow;
+      nsCOMPtr<nsIMsgMailSession> mailSession = do_GetService(NS_MSGMAILSESSION_CONTRACTID, &rv);
+      if (NS_SUCCEEDED(rv))
+        mailSession->GetTopmostMsgWindow(getter_AddRefs(msgWindow));
+
+      rv = newMailParser->Init(rootFolder, this,
+                               msgWindow, newHdr, outFileStream);
+
+      uint32_t bytesWritten, messageLen = strlen(aMessages[i]);
+      outFileStream->Write(aMessages[i], messageLen, &bytesWritten);
+      newMailParser->BufferInput(aMessages[i], messageLen);
+
+      msgStore->FinishNewMessage(outFileStream, newHdr);
+      outFileStream->Close();
+      outFileStream = nullptr;
+      newMailParser->OnStopRequest(nullptr, nullptr, NS_OK);
+      newMailParser->EndMsgDownload();
+      hdrArray->AppendElement(newHdr, false);
+    }
+    NS_ADDREF(*aHdrArray = hdrArray);
+  }
+  ReleaseSemaphore(static_cast<nsIMsgLocalMailFolder*>(this));
+  return rv;
+}
+
+NS_IMETHODIMP
+nsMsgLocalMailFolder::WarnIfLocalFileTooBig(nsIMsgWindow *aWindow,
+                                            int64_t aSpaceRequested,
+                                            bool *aTooBig)
+{
+  NS_ENSURE_ARG_POINTER(aTooBig);
+
+  *aTooBig = true;
+  nsCOMPtr<nsIMsgPluggableStore> msgStore;
+  nsresult rv = GetMsgStore(getter_AddRefs(msgStore));
+  NS_ENSURE_SUCCESS(rv, rv);
+  bool spaceAvailable = false;
+  // check if we have a reasonable amount of space left
+  rv = msgStore->HasSpaceAvailable(this, aSpaceRequested, &spaceAvailable);
+  if (NS_SUCCEEDED(rv) && spaceAvailable) {
+    *aTooBig = false;
+  } else if (rv == NS_ERROR_FILE_TOO_BIG) {
+    ThrowAlertMsg("mailboxTooLarge", aWindow);
+  } else {
+    ThrowAlertMsg("outOfDiskSpace", aWindow);
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsMsgLocalMailFolder::FetchMsgPreviewText(nsMsgKey *aKeysToFetch, uint32_t aNumKeys,
+                                                 bool aLocalOnly, nsIUrlListener *aUrlListener,
+                                                 bool *aAsyncResults)
+{
+  NS_ENSURE_ARG_POINTER(aKeysToFetch);
+  NS_ENSURE_ARG_POINTER(aAsyncResults);
+
+  *aAsyncResults = false;
+  nsCOMPtr <nsIInputStream> inputStream;
+  nsCOMPtr<nsIMsgPluggableStore> msgStore;
+  nsresult rv = GetMsgStore(getter_AddRefs(msgStore));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  for (uint32_t i = 0; i < aNumKeys; i++)
+  {
+    nsCOMPtr <nsIMsgDBHdr> msgHdr;
+    nsCString prevBody;
+    rv = GetMessageHeader(aKeysToFetch[i], getter_AddRefs(msgHdr));
+    NS_ENSURE_SUCCESS(rv, rv);
+    // ignore messages that already have a preview body.
+    msgHdr->GetStringProperty("preview", getter_Copies(prevBody));
+    if (!prevBody.IsEmpty())
+      continue;
+
+    bool reusable;
+    rv = GetMsgInputStream(msgHdr, &reusable, getter_AddRefs(inputStream));
+    NS_ENSURE_SUCCESS(rv,rv);
+    rv = GetMsgPreviewTextFromStream(msgHdr, inputStream);
+  }
+  return rv;
+}
+
+NS_IMETHODIMP nsMsgLocalMailFolder::AddKeywordsToMessages(nsIArray *aMessages, const nsACString& aKeywords)
+{
+  return ChangeKeywordForMessages(aMessages, aKeywords, true /* add */);
+}
+nsresult nsMsgLocalMailFolder::ChangeKeywordForMessages(nsIArray *aMessages, const nsACString& aKeywords, bool add)
+{
+  nsresult rv = (add) ? nsMsgDBFolder::AddKeywordsToMessages(aMessages, aKeywords)
+                      : nsMsgDBFolder::RemoveKeywordsFromMessages(aMessages, aKeywords);
+
+    NS_ENSURE_SUCCESS(rv, rv);
+  nsCOMPtr<nsIMsgPluggableStore> msgStore;
+  GetMsgStore(getter_AddRefs(msgStore));
+    NS_ENSURE_SUCCESS(rv, rv);
+  return msgStore->ChangeKeywords(aMessages, aKeywords, add);
+}
+
+NS_IMETHODIMP nsMsgLocalMailFolder::RemoveKeywordsFromMessages(nsIArray *aMessages, const nsACString& aKeywords)
+{
+  return ChangeKeywordForMessages(aMessages, aKeywords, false /* remove */);
+}
+
+NS_IMETHODIMP nsMsgLocalMailFolder::UpdateNewMsgHdr(nsIMsgDBHdr* aOldHdr, nsIMsgDBHdr* aNewHdr)
+{
+  NS_ENSURE_ARG_POINTER(aOldHdr);
+  NS_ENSURE_ARG_POINTER(aNewHdr);
+  // Preserve any properties set on the message.
+  CopyPropertiesToMsgHdr(aNewHdr, aOldHdr, true);
+
+  // Preserve keywords manually, since they are set as don't preserve.
+  nsCString keywordString;
+  aOldHdr->GetStringProperty("keywords", getter_Copies(keywordString));
+  aNewHdr->SetStringProperty("keywords", keywordString.get());
+
+  // If the junk score was set by the plugin, remove junkscore to force a new
+  // junk analysis, this time using the body.
+  nsCString junkScoreOrigin;
+  aOldHdr->GetStringProperty("junkscoreorigin", getter_Copies(junkScoreOrigin));
+  if (junkScoreOrigin.EqualsLiteral("plugin"))
+    aNewHdr->SetStringProperty("junkscore", "");
+
+  return NS_OK;
+}
diff --git a/mailnews/local/src/nsLocalMailFolder.h b/mailnews/local/src/nsLocalMailFolder.h
new file mode 100644
index 000000000..e8c395342
--- /dev/null
+++ b/mailnews/local/src/nsLocalMailFolder.h
@@ -0,0 +1,276 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+   Interface for representing Local Mail folders.
+*/
+
+#ifndef nsMsgLocalMailFolder_h__
+#define nsMsgLocalMailFolder_h__
+
+#include "mozilla/Attributes.h"
+#include "nsMsgDBFolder.h" /* include the interface we are going to support */
+#include "nsAutoPtr.h"
+#include "nsICopyMessageListener.h"
+#include "nsIFileStreams.h"
+#include "nsIPop3IncomingServer.h"  // need this for an interface ID
+#include "nsMsgTxn.h"
+#include "nsIMsgMessageService.h"
+#include "nsIMsgParseMailMsgState.h"
+#include "nsITransactionManager.h"
+#include "nsIMsgLocalMailFolder.h"
+#include "nsISeekableStream.h"
+#include "nsIMutableArray.h"
+#include "nsLocalUndoTxn.h"
+
+#define COPY_BUFFER_SIZE 16384
+
+class nsParseMailMessageState;
+
+struct nsLocalMailCopyState
+{
+  nsLocalMailCopyState();
+  virtual ~nsLocalMailCopyState();
+  
+  nsCOMPtr <nsIOutputStream> m_fileStream;
+  nsCOMPtr<nsIMsgPluggableStore> m_msgStore;
+  nsCOMPtr<nsISupports> m_srcSupport;
+  /// Source nsIMsgDBHdr instances.
+  nsCOMPtr<nsIArray> m_messages;
+  /// Destination nsIMsgDBHdr instances.
+  nsCOMPtr<nsIMutableArray> m_destMessages;
+  RefPtr<nsLocalMoveCopyMsgTxn> m_undoMsgTxn;
+  nsCOMPtr<nsIMsgDBHdr> m_message; // current copy message
+  nsMsgMessageFlagType m_flags; // current copy message flags
+  RefPtr<nsParseMailMessageState> m_parseMsgState;
+  nsCOMPtr<nsIMsgCopyServiceListener> m_listener;
+  nsCOMPtr<nsIMsgWindow> m_msgWindow;
+  nsCOMPtr<nsIMsgDatabase> m_destDB;
+
+  // for displaying status;
+  nsCOMPtr <nsIMsgStatusFeedback> m_statusFeedback;
+  nsCOMPtr <nsIStringBundle> m_stringBundle;
+  int64_t m_lastProgressTime;
+
+  nsMsgKey m_curDstKey;
+  uint32_t m_curCopyIndex;
+  nsCOMPtr <nsIMsgMessageService> m_messageService;
+  /// The number of messages in m_messages.
+  uint32_t m_totalMsgCount;
+  char *m_dataBuffer;
+  uint32_t m_dataBufferSize;
+  uint32_t m_leftOver;
+  bool m_isMove;
+  bool m_isFolder;   // isFolder move/copy
+  bool m_dummyEnvelopeNeeded;
+  bool m_copyingMultipleMessages;
+  bool m_fromLineSeen;
+  bool m_allowUndo;
+  bool m_writeFailed;
+  bool m_notifyFolderLoaded;
+  bool m_wholeMsgInStream;
+  nsCString    m_newMsgKeywords;
+  nsCOMPtr <nsIMsgDBHdr> m_newHdr;
+};
+
+struct nsLocalFolderScanState
+{
+  nsLocalFolderScanState();
+  ~nsLocalFolderScanState();
+
+  nsCOMPtr<nsIInputStream> m_inputStream;
+  nsCOMPtr<nsISeekableStream> m_seekableStream;
+  nsCOMPtr<nsIMsgPluggableStore> m_msgStore;
+  nsCString m_header;
+  nsCString m_accountKey;
+  const char *m_uidl; // memory is owned by m_header
+  // false if we need a new input stream for each message
+  bool m_streamReusable;
+};
+
+class nsMsgLocalMailFolder : public nsMsgDBFolder,
+                             public nsIMsgLocalMailFolder,
+                             public nsICopyMessageListener
+{
+public:
+  nsMsgLocalMailFolder(void);
+  NS_DECL_NSICOPYMESSAGELISTENER
+  NS_DECL_NSIMSGLOCALMAILFOLDER
+  NS_DECL_NSIJUNKMAILCLASSIFICATIONLISTENER
+  NS_DECL_ISUPPORTS_INHERITED
+  // nsIRDFResource methods:
+  NS_IMETHOD Init(const char *aURI) override;
+
+  // nsIUrlListener methods
+  NS_IMETHOD OnStartRunningUrl(nsIURI * aUrl) override;
+  NS_IMETHOD OnStopRunningUrl(nsIURI * aUrl, nsresult aExitCode) override;
+
+  // nsIMsgFolder methods:
+  NS_IMETHOD GetSubFolders(nsISimpleEnumerator* *aResult) override;
+  NS_IMETHOD GetMsgDatabase(nsIMsgDatabase **aMsgDatabase) override;
+
+  NS_IMETHOD OnAnnouncerGoingAway(nsIDBChangeAnnouncer *instigator) override;
+  NS_IMETHOD GetMessages(nsISimpleEnumerator **result) override;
+  NS_IMETHOD UpdateFolder(nsIMsgWindow *aWindow) override;
+
+  NS_IMETHOD CreateSubfolder(const nsAString& folderName ,nsIMsgWindow *msgWindow) override;
+
+  NS_IMETHOD Compact(nsIUrlListener *aListener, nsIMsgWindow *aMsgWindow) override;
+  NS_IMETHOD CompactAll(nsIUrlListener *aListener, nsIMsgWindow *aMsgWindow, bool aCompactOfflineAlso) override;
+  NS_IMETHOD EmptyTrash(nsIMsgWindow *msgWindow, nsIUrlListener *aListener) override;
+  NS_IMETHOD Delete () override;
+  NS_IMETHOD DeleteSubFolders(nsIArray *folders, nsIMsgWindow *msgWindow) override;
+  NS_IMETHOD CreateStorageIfMissing(nsIUrlListener* urlListener) override;
+  NS_IMETHOD Rename (const nsAString& aNewName, nsIMsgWindow *msgWindow) override;
+  NS_IMETHOD RenameSubFolders (nsIMsgWindow *msgWindow, nsIMsgFolder *oldFolder) override;
+
+  NS_IMETHOD GetPrettyName(nsAString& prettyName) override; // Override of the base, for top-level mail folder
+  NS_IMETHOD SetPrettyName(const nsAString& aName) override;
+
+  NS_IMETHOD GetFolderURL(nsACString& url) override;
+
+  NS_IMETHOD GetManyHeadersToDownload(bool *retval) override;
+
+  NS_IMETHOD GetDeletable (bool *deletable) override;
+  NS_IMETHOD GetSizeOnDisk(int64_t *size) override;
+
+  NS_IMETHOD GetDBFolderInfoAndDB(nsIDBFolderInfo **folderInfo, nsIMsgDatabase **db) override;
+
+  NS_IMETHOD DeleteMessages(nsIArray *messages, 
+                      nsIMsgWindow *msgWindow, bool
+                      deleteStorage, bool isMove,
+                      nsIMsgCopyServiceListener* listener, bool allowUndo) override;
+  NS_IMETHOD CopyMessages(nsIMsgFolder *srcFolder, nsIArray* messages,
+                          bool isMove, nsIMsgWindow *msgWindow,
+                          nsIMsgCopyServiceListener* listener, bool isFolder, bool allowUndo) override;
+  NS_IMETHOD CopyFolder(nsIMsgFolder *srcFolder, bool isMoveFolder, nsIMsgWindow *msgWindow,
+                          nsIMsgCopyServiceListener* listener) override;
+  NS_IMETHOD CopyFileMessage(nsIFile* aFile, nsIMsgDBHdr* msgToReplace,
+                             bool isDraftOrTemplate, 
+                             uint32_t newMsgFlags,
+                             const nsACString &aNewMsgKeywords,
+                             nsIMsgWindow *msgWindow,
+                             nsIMsgCopyServiceListener* listener) override;
+
+  NS_IMETHOD AddMessageDispositionState(nsIMsgDBHdr *aMessage, nsMsgDispositionState aDispositionFlag) override;
+  NS_IMETHOD MarkMessagesRead(nsIArray *aMessages, bool aMarkRead) override;
+  NS_IMETHOD MarkMessagesFlagged(nsIArray *aMessages, bool aMarkFlagged) override;
+  NS_IMETHOD MarkAllMessagesRead(nsIMsgWindow *aMsgWindow) override;
+  NS_IMETHOD MarkThreadRead(nsIMsgThread *thread) override;
+  NS_IMETHOD GetNewMessages(nsIMsgWindow *aWindow, nsIUrlListener *aListener) override;
+  NS_IMETHOD NotifyCompactCompleted() override;
+  NS_IMETHOD Shutdown(bool shutdownChildren) override;
+
+  NS_IMETHOD WriteToFolderCacheElem(nsIMsgFolderCacheElement *element) override;
+  NS_IMETHOD ReadFromFolderCacheElem(nsIMsgFolderCacheElement *element) override;
+
+  NS_IMETHOD GetName(nsAString& aName) override;
+
+  // Used when headers_only is TRUE
+  NS_IMETHOD DownloadMessagesForOffline(nsIArray *aMessages, nsIMsgWindow *aWindow) override;
+  NS_IMETHOD FetchMsgPreviewText(nsMsgKey *aKeysToFetch, uint32_t aNumKeys,
+                                                 bool aLocalOnly, nsIUrlListener *aUrlListener, 
+                                                 bool *aAsyncResults) override;
+  NS_IMETHOD AddKeywordsToMessages(nsIArray *aMessages, const nsACString& aKeywords) override;
+  NS_IMETHOD RemoveKeywordsFromMessages(nsIArray *aMessages, const nsACString& aKeywords) override;
+  NS_IMETHOD GetIncomingServerType(nsACString& serverType) override;
+
+protected:
+  virtual ~nsMsgLocalMailFolder();
+  nsresult CreateChildFromURI(const nsCString &uri, nsIMsgFolder **folder) override;
+  nsresult CopyFolderAcrossServer(nsIMsgFolder *srcFolder, nsIMsgWindow *msgWindow,nsIMsgCopyServiceListener* listener);
+
+  nsresult CreateSubFolders(nsIFile *path);
+  nsresult GetTrashFolder(nsIMsgFolder** trashFolder);
+  nsresult WriteStartOfNewMessage();
+
+  // CreateSubfolder, but without the nsIMsgFolderListener notification
+  nsresult CreateSubfolderInternal(const nsAString& folderName, nsIMsgWindow *msgWindow,
+                                   nsIMsgFolder **aNewFolder);
+
+  nsresult IsChildOfTrash(bool *result);
+  nsresult RecursiveSetDeleteIsMoveTrash(bool bVal);
+  nsresult ConfirmFolderDeletion(nsIMsgWindow *aMsgWindow, nsIMsgFolder *aFolder, bool *aResult);
+
+  nsresult DeleteMessage(nsISupports *message, nsIMsgWindow *msgWindow,
+                   bool deleteStorage, bool commit);
+  nsresult GetDatabase() override;
+  // this will set mDatabase, if successful. It will also create a .msf file
+  // for an empty local mail folder. It will leave invalid DBs in place, and
+  // return an error.
+  nsresult OpenDatabase();
+
+  // copy message helper
+  nsresult DisplayMoveCopyStatusMsg();
+
+  nsresult CopyMessageTo(nsISupports *message, nsIMsgFolder *dstFolder,
+                         nsIMsgWindow *msgWindow, bool isMove);
+
+  /**
+   * Checks if there's room in the target folder to copy message(s) into.
+   * If not, handles alerting the user, and sending the copy notifications.
+   */
+  bool CheckIfSpaceForCopy(nsIMsgWindow *msgWindow,
+                             nsIMsgFolder *srcFolder,
+                             nsISupports *srcSupports,
+                             bool isMove,
+                             int64_t totalMsgSize);
+
+  // copy multiple messages at a time from this folder
+  nsresult CopyMessagesTo(nsIArray *messages, nsTArray<nsMsgKey> &keyArray,
+                                       nsIMsgWindow *aMsgWindow,
+                                       nsIMsgFolder *dstFolder,
+                                       bool isMove);
+  nsresult InitCopyState(nsISupports* aSupport, nsIArray* messages,
+                         bool isMove, nsIMsgCopyServiceListener* listener, nsIMsgWindow *msgWindow, bool isMoveFolder, bool allowUndo);
+  nsresult InitCopyMsgHdrAndFileStream();
+  // preserve message metadata when moving or copying messages
+  void CopyPropertiesToMsgHdr(nsIMsgDBHdr *destHdr, nsIMsgDBHdr *srcHdr, bool isMove);
+  virtual nsresult CreateBaseMessageURI(const nsACString& aURI) override;
+  nsresult ChangeKeywordForMessages(nsIArray *aMessages, const nsACString& aKeyword, bool add);
+  bool GetDeleteFromServerOnMove();
+  void CopyHdrPropertiesWithSkipList(nsIMsgDBHdr *destHdr,
+                                     nsIMsgDBHdr *srcHdr,
+                                     const nsCString &skipList);
+
+protected:
+  nsLocalMailCopyState *mCopyState; //We only allow one of these at a time
+  nsCString mType;
+  bool mHaveReadNameFromDB;
+  bool mInitialized;
+  bool mCheckForNewMessagesAfterParsing;
+  bool m_parsingFolder;
+  nsCOMPtr<nsIUrlListener> mReparseListener;
+  nsTArray<nsMsgKey> mSpamKeysToMove;
+  nsresult setSubfolderFlag(const nsAString& aFolderName, uint32_t flags);
+
+  // state variables for DownloadMessagesForOffline
+
+  // Do we notify the owning window of Delete's before or after
+  // Adding the new msg?
+#define DOWNLOAD_NOTIFY_FIRST 1
+#define DOWNLOAD_NOTIFY_LAST  2
+
+#ifndef DOWNLOAD_NOTIFY_STYLE
+#define DOWNLOAD_NOTIFY_STYLE DOWNLOAD_NOTIFY_FIRST
+#endif
+
+  nsCOMArray<nsIMsgDBHdr> mDownloadMessages;
+  nsCOMPtr<nsIMsgWindow> mDownloadWindow;
+  nsMsgKey mDownloadSelectKey;
+  uint32_t mDownloadState;
+#define DOWNLOAD_STATE_NONE 0
+#define DOWNLOAD_STATE_INITED 1
+#define DOWNLOAD_STATE_GOTMSG 2
+#define DOWNLOAD_STATE_DIDSEL 3
+
+#if DOWNLOAD_NOTIFY_STYLE == DOWNLOAD_NOTIFY_LAST
+  nsMsgKey mDownloadOldKey;
+  nsMsgKey mDownloadOldParent;
+  uint32_t mDownloadOldFlags;
+#endif
+};
+
+#endif // nsMsgLocalMailFolder_h__
diff --git a/mailnews/local/src/nsLocalUndoTxn.cpp b/mailnews/local/src/nsLocalUndoTxn.cpp
new file mode 100644
index 000000000..a53ac992e
--- /dev/null
+++ b/mailnews/local/src/nsLocalUndoTxn.cpp
@@ -0,0 +1,560 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "msgCore.h"
+#include "nsIMsgHdr.h"
+#include "nsLocalUndoTxn.h"
+#include "nsImapCore.h"
+#include "nsMsgImapCID.h"
+#include "nsIImapService.h"
+#include "nsIUrlListener.h"
+#include "nsIMsgLocalMailFolder.h"
+#include "nsIMsgMailSession.h"
+#include "nsIMsgFolderNotificationService.h"
+#include "nsThreadUtils.h"
+#include "nsIMsgDatabase.h"
+#include "nsIMutableArray.h"
+#include "nsServiceManagerUtils.h"
+#include "nsComponentManagerUtils.h"
+#include "nsMsgUtils.h"
+
+NS_IMPL_ISUPPORTS_INHERITED(nsLocalMoveCopyMsgTxn, nsMsgTxn, nsIFolderListener)
+
+nsLocalMoveCopyMsgTxn::nsLocalMoveCopyMsgTxn()  : m_srcIsImap4(false),
+  m_canUndelete(false)
+{
+}
+
+nsLocalMoveCopyMsgTxn::~nsLocalMoveCopyMsgTxn()
+{
+}
+
+nsresult
+nsLocalMoveCopyMsgTxn::Init(nsIMsgFolder* srcFolder, nsIMsgFolder* dstFolder,
+                            bool isMove)
+{
+    nsresult rv;
+    rv = SetSrcFolder(srcFolder);
+    NS_ENSURE_SUCCESS(rv, rv);
+    rv = SetDstFolder(dstFolder);
+    NS_ENSURE_SUCCESS(rv, rv);
+    m_isMove = isMove;
+
+    mUndoFolderListener = nullptr;
+
+    nsCString protocolType;
+    rv = srcFolder->GetURI(protocolType);
+    protocolType.SetLength(protocolType.FindChar(':'));
+    if (MsgLowerCaseEqualsLiteral(protocolType, "imap"))
+      m_srcIsImap4 = true;
+    return nsMsgTxn::Init();
+}
+nsresult 
+nsLocalMoveCopyMsgTxn::GetSrcIsImap(bool *isImap)
+{
+  *isImap = m_srcIsImap4;
+  return NS_OK;
+}
+nsresult
+nsLocalMoveCopyMsgTxn::SetSrcFolder(nsIMsgFolder* srcFolder)
+{
+  nsresult rv = NS_ERROR_NULL_POINTER;
+  if (srcFolder)
+    m_srcFolder = do_GetWeakReference(srcFolder, &rv);
+  return rv;
+}
+
+nsresult
+nsLocalMoveCopyMsgTxn::SetDstFolder(nsIMsgFolder* dstFolder)
+{
+  nsresult rv = NS_ERROR_NULL_POINTER;
+  if (dstFolder)
+    m_dstFolder = do_GetWeakReference(dstFolder, &rv);
+  return rv;
+}
+
+nsresult
+nsLocalMoveCopyMsgTxn::AddSrcKey(nsMsgKey aKey)
+{
+  m_srcKeyArray.AppendElement(aKey);
+  return NS_OK;
+}
+
+nsresult
+nsLocalMoveCopyMsgTxn::AddSrcStatusOffset(uint32_t aStatusOffset)
+{
+  m_srcStatusOffsetArray.AppendElement(aStatusOffset);
+  return NS_OK;
+}
+
+
+nsresult
+nsLocalMoveCopyMsgTxn::AddDstKey(nsMsgKey aKey)
+{
+  m_dstKeyArray.AppendElement(aKey);
+  return NS_OK;
+}
+
+nsresult
+nsLocalMoveCopyMsgTxn::AddDstMsgSize(uint32_t msgSize)
+{
+    m_dstSizeArray.AppendElement(msgSize);
+    return NS_OK;
+}
+
+nsresult
+nsLocalMoveCopyMsgTxn::UndoImapDeleteFlag(nsIMsgFolder* folder, 
+                                          nsTArray<nsMsgKey>& keyArray,
+                                          bool deleteFlag)
+{
+  nsresult rv = NS_ERROR_FAILURE;
+  if (m_srcIsImap4)
+  {
+    nsCOMPtr<nsIImapService> imapService = do_GetService(NS_IMAPSERVICE_CONTRACTID, &rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+    nsCOMPtr<nsIUrlListener> urlListener;
+    nsCString msgIds;
+    uint32_t i, count = keyArray.Length();
+    urlListener = do_QueryInterface(folder, &rv);
+    for (i=0; i < count; i++)
+    {
+      if (!msgIds.IsEmpty())
+          msgIds.Append(',');
+      msgIds.AppendInt((int32_t) keyArray[i]);
+    }
+    // This is to make sure that we are in the selected state
+    // when executing the imap url; we don't want to load the
+    // folder so use lite select to do the trick
+    rv = imapService->LiteSelectFolder(folder,
+                                       urlListener, nullptr, nullptr);
+    if (!deleteFlag)
+        rv =imapService->AddMessageFlags(folder,
+                                         urlListener, nullptr,
+                                         msgIds,
+                                         kImapMsgDeletedFlag,
+                                         true);
+    else
+        rv = imapService->SubtractMessageFlags(folder,
+                                               urlListener, nullptr,
+                                               msgIds,
+                                               kImapMsgDeletedFlag,
+                                               true);
+    if (NS_SUCCEEDED(rv) && m_msgWindow)
+        folder->UpdateFolder(m_msgWindow);
+    rv = NS_OK; // always return NS_OK to indicate that the src is imap
+  }
+  else
+    rv = NS_ERROR_FAILURE;
+  return rv;
+}
+
+NS_IMETHODIMP
+nsLocalMoveCopyMsgTxn::UndoTransaction()
+{
+  nsresult rv;
+  nsCOMPtr<nsIMsgDatabase> dstDB;
+  
+  nsCOMPtr<nsIMsgFolder> dstFolder = do_QueryReferent(m_dstFolder, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+  nsCOMPtr<nsIMsgLocalMailFolder> dstlocalMailFolder = do_QueryReferent(m_dstFolder, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+  dstlocalMailFolder->GetDatabaseWOReparse(getter_AddRefs(dstDB));
+
+  if (!dstDB)
+  {
+    // This will listen for the db reparse finishing, and the corresponding
+    // FolderLoadedNotification. When it gets that, it will then call
+    // UndoTransactionInternal.
+    mUndoFolderListener = new nsLocalUndoFolderListener(this, dstFolder);
+    if (!mUndoFolderListener)
+      return NS_ERROR_OUT_OF_MEMORY; 
+    NS_ADDREF(mUndoFolderListener);
+    
+    nsCOMPtr<nsIMsgMailSession> mailSession = 
+      do_GetService(NS_MSGMAILSESSION_CONTRACTID, &rv); 
+    NS_ENSURE_SUCCESS(rv,rv);
+    
+    rv = mailSession->AddFolderListener(mUndoFolderListener, nsIFolderListener::event);
+    NS_ENSURE_SUCCESS(rv,rv);
+    
+    rv = dstFolder->GetMsgDatabase(getter_AddRefs(dstDB));
+    NS_ENSURE_SUCCESS(rv,rv);
+  }
+  else
+    rv = UndoTransactionInternal();
+  return rv;
+}
+
+nsresult 
+nsLocalMoveCopyMsgTxn::UndoTransactionInternal()
+{
+  nsresult rv = NS_ERROR_FAILURE;
+
+  if (mUndoFolderListener)
+  {
+    nsCOMPtr<nsIMsgMailSession> mailSession = 
+      do_GetService(NS_MSGMAILSESSION_CONTRACTID, &rv); 
+    NS_ENSURE_SUCCESS(rv,rv);
+    
+    rv = mailSession->RemoveFolderListener(mUndoFolderListener);
+    NS_ENSURE_SUCCESS(rv,rv);
+    
+    NS_RELEASE(mUndoFolderListener);
+    mUndoFolderListener = nullptr;
+  }
+
+  nsCOMPtr<nsIMsgDatabase> srcDB;
+  nsCOMPtr<nsIMsgDatabase> dstDB;
+  nsCOMPtr<nsIMsgFolder> srcFolder = do_QueryReferent(m_srcFolder, &rv);
+  NS_ENSURE_SUCCESS(rv,rv);
+  
+  nsCOMPtr<nsIMsgFolder> dstFolder = do_QueryReferent(m_dstFolder, &rv);
+  NS_ENSURE_SUCCESS(rv,rv);
+  
+  rv = srcFolder->GetMsgDatabase(getter_AddRefs(srcDB));
+  if(NS_FAILED(rv)) return rv;
+
+  rv = dstFolder->GetMsgDatabase(getter_AddRefs(dstDB));
+  if (NS_FAILED(rv)) return rv;
+
+  uint32_t count = m_srcKeyArray.Length();
+  uint32_t i;
+  nsCOMPtr<nsIMsgDBHdr> oldHdr;
+  nsCOMPtr<nsIMsgDBHdr> newHdr;
+
+  // protect against a bogus undo txn without any source keys
+  // see bug #179856 for details
+  NS_ASSERTION(count, "no source keys");
+  if (!count)
+    return NS_ERROR_UNEXPECTED;
+
+  if (m_isMove)
+  {
+    if (m_srcIsImap4)
+    {
+      bool deleteFlag = true;  //message has been deleted -we are trying to undo it
+      CheckForToggleDelete(srcFolder, m_srcKeyArray[0], &deleteFlag); //there could have been a toggle.
+      rv = UndoImapDeleteFlag(srcFolder, m_srcKeyArray, deleteFlag);
+    }
+    else if (m_canUndelete)
+    {
+      nsCOMPtr<nsIMutableArray> srcMessages =
+        do_CreateInstance(NS_ARRAY_CONTRACTID);
+      nsCOMPtr<nsIMutableArray> dstMessages =
+        do_CreateInstance(NS_ARRAY_CONTRACTID);
+
+      srcDB->StartBatch();
+      for (i = 0; i < count; i++)
+      {
+        rv = dstDB->GetMsgHdrForKey(m_dstKeyArray[i], 
+                                    getter_AddRefs(oldHdr));
+        NS_ASSERTION(oldHdr, "fatal ... cannot get old msg header\n");
+        if (NS_SUCCEEDED(rv) && oldHdr)
+        {
+          rv = srcDB->CopyHdrFromExistingHdr(m_srcKeyArray[i],
+                                             oldHdr, true,
+                                             getter_AddRefs(newHdr));
+          NS_ASSERTION(newHdr, 
+                       "fatal ... cannot create new msg header\n");
+          if (NS_SUCCEEDED(rv) && newHdr)
+          {
+            newHdr->SetStatusOffset(m_srcStatusOffsetArray[i]);
+            srcDB->UndoDelete(newHdr);
+            srcMessages->AppendElement(newHdr, false);
+            // (we want to keep these two lists in sync)
+            dstMessages->AppendElement(oldHdr, false);
+          }
+        }
+      }
+      srcDB->EndBatch();
+
+      nsCOMPtr<nsIMsgFolderNotificationService>
+        notifier(do_GetService(NS_MSGNOTIFICATIONSERVICE_CONTRACTID));
+      if (notifier)
+      {
+        // Remember that we're actually moving things back from the destination
+        //  to the source!
+        notifier->NotifyMsgsMoveCopyCompleted(true, dstMessages,
+                                              srcFolder, srcMessages);
+      }
+
+      nsCOMPtr <nsIMsgLocalMailFolder> localFolder = do_QueryInterface(srcFolder);
+      if (localFolder)
+        localFolder->MarkMsgsOnPop3Server(srcMessages, POP3_NONE /*deleteMsgs*/);
+    }
+    else // undoing a move means moving the messages back.
+    {
+      nsCOMPtr<nsIMutableArray> dstMessages =
+        do_CreateInstance(NS_ARRAY_CONTRACTID);
+      m_numHdrsCopied = 0;
+      m_srcKeyArray.Clear();
+      for (i = 0; i < count; i++)
+      {
+        // GetMsgHdrForKey is not a test for whether the key exists, so check.
+        bool hasKey = false;
+        dstDB->ContainsKey(m_dstKeyArray[i], &hasKey);
+        nsCOMPtr<nsIMsgDBHdr> dstHdr;
+        if (hasKey)
+          dstDB->GetMsgHdrForKey(m_dstKeyArray[i], getter_AddRefs(dstHdr));
+        if (dstHdr)
+        {
+          nsCString messageId;
+          dstHdr->GetMessageId(getter_Copies(messageId));
+          dstMessages->AppendElement(dstHdr, false);
+          m_copiedMsgIds.AppendElement(messageId);
+        }
+        else
+        {
+          NS_WARNING("Cannot get old msg header");
+        }
+      }
+      if (m_copiedMsgIds.Length())
+      {
+        srcFolder->AddFolderListener(this);
+        m_undoing = true;
+        return srcFolder->CopyMessages(dstFolder, dstMessages,
+                                       true, nullptr, nullptr, false,
+                                       false);
+      }
+      else
+      {
+        // Nothing to do, probably because original messages were deleted.
+        NS_WARNING("Undo did not find any messages to move");
+      }
+    }
+    srcDB->SetSummaryValid(true);
+  }
+
+  dstDB->DeleteMessages(m_dstKeyArray.Length(), m_dstKeyArray.Elements(), nullptr);
+  dstDB->SetSummaryValid(true);
+
+  return rv;
+}
+
+NS_IMETHODIMP
+nsLocalMoveCopyMsgTxn::RedoTransaction()
+{
+  nsresult rv;
+  nsCOMPtr<nsIMsgDatabase> srcDB;
+  nsCOMPtr<nsIMsgDatabase> dstDB;
+
+  nsCOMPtr<nsIMsgFolder> srcFolder = do_QueryReferent(m_srcFolder, &rv);
+  NS_ENSURE_SUCCESS(rv,rv);
+
+  nsCOMPtr<nsIMsgFolder> dstFolder = do_QueryReferent(m_dstFolder, &rv);
+  NS_ENSURE_SUCCESS(rv,rv);
+  
+  rv = srcFolder->GetMsgDatabase(getter_AddRefs(srcDB));
+  if(NS_FAILED(rv)) return rv;
+  rv = dstFolder->GetMsgDatabase(getter_AddRefs(dstDB));
+  if (NS_FAILED(rv)) return rv;
+
+  uint32_t count = m_srcKeyArray.Length();
+  uint32_t i;
+  nsCOMPtr<nsIMsgDBHdr> oldHdr;
+  nsCOMPtr<nsIMsgDBHdr> newHdr;
+
+  nsCOMPtr<nsIMutableArray> srcMessages = do_CreateInstance(NS_ARRAY_CONTRACTID);
+  nsCOMPtr <nsISupports> msgSupports;
+  
+  for (i=0; i<count; i++)
+  {
+    rv = srcDB->GetMsgHdrForKey(m_srcKeyArray[i], 
+                                getter_AddRefs(oldHdr));
+    NS_ASSERTION(oldHdr, "fatal ... cannot get old msg header\n");
+
+    if (NS_SUCCEEDED(rv) && oldHdr)
+    {
+      msgSupports =do_QueryInterface(oldHdr);
+      srcMessages->AppendElement(msgSupports, false);
+      
+      if (m_canUndelete)
+      {
+      rv = dstDB->CopyHdrFromExistingHdr(m_dstKeyArray[i],
+                                         oldHdr, true,
+                                         getter_AddRefs(newHdr));
+      NS_ASSERTION(newHdr, "fatal ... cannot get new msg header\n");
+      if (NS_SUCCEEDED(rv) && newHdr)
+      {
+        if (i < m_dstSizeArray.Length())
+          rv = newHdr->SetMessageSize(m_dstSizeArray[i]);
+        dstDB->UndoDelete(newHdr);
+      }
+    }
+  }
+  }
+  dstDB->SetSummaryValid(true);
+
+  if (m_isMove)
+  {
+    if (m_srcIsImap4)
+    {
+      // protect against a bogus undo txn without any source keys
+      // see bug #179856 for details
+      NS_ASSERTION(!m_srcKeyArray.IsEmpty(), "no source keys");
+      if (m_srcKeyArray.IsEmpty())
+        return NS_ERROR_UNEXPECTED;
+    
+      bool deleteFlag = false; //message is un-deleted- we are trying to redo
+      CheckForToggleDelete(srcFolder, m_srcKeyArray[0], &deleteFlag); // there could have been a toggle
+      rv = UndoImapDeleteFlag(srcFolder, m_srcKeyArray, deleteFlag);
+    }
+    else if (m_canUndelete)
+    {
+      nsCOMPtr <nsIMsgLocalMailFolder> localFolder = do_QueryInterface(srcFolder);
+      if (localFolder)
+        localFolder->MarkMsgsOnPop3Server(srcMessages, POP3_DELETE /*deleteMsgs*/);
+
+      rv = srcDB->DeleteMessages(m_srcKeyArray.Length(), m_srcKeyArray.Elements(), nullptr);
+      srcDB->SetSummaryValid(true);
+    }
+    else
+    {
+      nsCOMPtr<nsIMsgDBHdr> srcHdr;
+      m_numHdrsCopied = 0;
+      m_dstKeyArray.Clear();
+      for (i = 0; i < count; i++)
+      {
+        srcDB->GetMsgHdrForKey(m_srcKeyArray[i], getter_AddRefs(srcHdr));
+        NS_ASSERTION(srcHdr, "fatal ... cannot get old msg header\n");
+        if (srcHdr)
+        {
+          nsCString messageId;
+          srcHdr->GetMessageId(getter_Copies(messageId));
+          m_copiedMsgIds.AppendElement(messageId);
+        }
+      }
+      dstFolder->AddFolderListener(this);
+      m_undoing = false;
+      return dstFolder->CopyMessages(srcFolder, srcMessages, true, nullptr,
+                                     nullptr, false, false);
+    }
+  }
+
+  return rv;
+}
+
+NS_IMETHODIMP nsLocalMoveCopyMsgTxn::OnItemAdded(nsIMsgFolder *parentItem, nsISupports *item)
+{
+  nsCOMPtr<nsIMsgDBHdr> msgHdr(do_QueryInterface(item));
+  if (msgHdr)
+  {
+    nsresult rv;
+    nsCOMPtr<nsIMsgFolder> folder = do_QueryReferent(m_undoing ? m_srcFolder :
+                                                     m_dstFolder, &rv);
+    NS_ENSURE_SUCCESS(rv,rv);
+    nsCString messageId;
+    msgHdr->GetMessageId(getter_Copies(messageId));
+    if (m_copiedMsgIds.Contains(messageId))
+    {
+      nsMsgKey msgKey;
+      msgHdr->GetMessageKey(&msgKey);
+      if (m_undoing)
+        m_srcKeyArray.AppendElement(msgKey);
+      else
+        m_dstKeyArray.AppendElement(msgKey);
+      if (++m_numHdrsCopied == m_copiedMsgIds.Length())
+      {
+        folder->RemoveFolderListener(this);
+        m_copiedMsgIds.Clear();
+      }
+    }
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsLocalMoveCopyMsgTxn::OnItemRemoved(nsIMsgFolder *parentItem, nsISupports *item)
+{
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsLocalMoveCopyMsgTxn::OnItemPropertyChanged(nsIMsgFolder *item, nsIAtom *property, const char *oldValue, const char *newValue)
+{
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsLocalMoveCopyMsgTxn::OnItemIntPropertyChanged(nsIMsgFolder *item, nsIAtom *property, int64_t oldValue, int64_t newValue)
+{
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsLocalMoveCopyMsgTxn::OnItemBoolPropertyChanged(nsIMsgFolder *item, nsIAtom *property, bool oldValue, bool newValue)
+{
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsLocalMoveCopyMsgTxn::OnItemUnicharPropertyChanged(nsIMsgFolder *item, nsIAtom *property, const char16_t *oldValue, const char16_t *newValue)
+{
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsLocalMoveCopyMsgTxn::OnItemPropertyFlagChanged(nsIMsgDBHdr *item, nsIAtom *property, uint32_t oldFlag, uint32_t newFlag)
+{
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsLocalMoveCopyMsgTxn::OnItemEvent(nsIMsgFolder *aItem, nsIAtom *aEvent)
+{
+  return NS_OK;
+}
+
+NS_IMPL_ISUPPORTS(nsLocalUndoFolderListener, nsIFolderListener)
+
+nsLocalUndoFolderListener::nsLocalUndoFolderListener(nsLocalMoveCopyMsgTxn *aTxn, nsIMsgFolder *aFolder)
+{
+  mTxn = aTxn;
+  mFolder = aFolder;
+}
+
+nsLocalUndoFolderListener::~nsLocalUndoFolderListener()
+{
+}
+
+NS_IMETHODIMP nsLocalUndoFolderListener::OnItemAdded(nsIMsgFolder *parentItem, nsISupports *item)
+{
+    return NS_OK;
+}
+
+NS_IMETHODIMP nsLocalUndoFolderListener::OnItemRemoved(nsIMsgFolder *parentItem, nsISupports *item)
+{
+    return NS_OK;
+}
+
+NS_IMETHODIMP nsLocalUndoFolderListener::OnItemPropertyChanged(nsIMsgFolder *item, nsIAtom *property, const char *oldValue, const char *newValue)
+{
+    return NS_OK;
+}
+
+NS_IMETHODIMP nsLocalUndoFolderListener::OnItemIntPropertyChanged(nsIMsgFolder *item, nsIAtom *property, int64_t oldValue, int64_t newValue)
+{
+    return NS_OK;
+}
+
+NS_IMETHODIMP nsLocalUndoFolderListener::OnItemBoolPropertyChanged(nsIMsgFolder *item, nsIAtom *property, bool oldValue, bool newValue)
+{
+    return NS_OK;
+}
+
+NS_IMETHODIMP nsLocalUndoFolderListener::OnItemUnicharPropertyChanged(nsIMsgFolder *item, nsIAtom *property, const char16_t *oldValue, const char16_t *newValue)
+{
+    return NS_OK;
+}
+
+NS_IMETHODIMP nsLocalUndoFolderListener::OnItemPropertyFlagChanged(nsIMsgDBHdr *item, nsIAtom *property, uint32_t oldFlag, uint32_t newFlag)
+{
+    return NS_OK;
+}
+
+NS_IMETHODIMP nsLocalUndoFolderListener::OnItemEvent(nsIMsgFolder *aItem, nsIAtom *aEvent)
+{
+  if (mTxn && mFolder && aItem == mFolder) {
+      bool isEqual = false;
+      aEvent->ScriptableEquals(NS_LITERAL_STRING("FolderLoaded"), &isEqual);
+      if (isEqual)
+        return mTxn->UndoTransactionInternal();
+  }
+
+  return NS_ERROR_FAILURE;
+}
diff --git a/mailnews/local/src/nsLocalUndoTxn.h b/mailnews/local/src/nsLocalUndoTxn.h
new file mode 100644
index 000000000..62f93f20a
--- /dev/null
+++ b/mailnews/local/src/nsLocalUndoTxn.h
@@ -0,0 +1,86 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsLocalUndoTxn_h__
+#define nsLocalUndoTxn_h__
+
+#include "mozilla/Attributes.h"
+#include "msgCore.h"
+#include "nsIMsgFolder.h"
+#include "nsMailboxService.h"
+#include "nsMsgTxn.h"
+#include "MailNewsTypes.h"
+#include "nsTArray.h"
+#include "nsCOMPtr.h"
+#include "nsIUrlListener.h"
+#include "nsIWeakReference.h"
+#include "nsIWeakReferenceUtils.h"
+
+class nsLocalUndoFolderListener;
+
+class nsLocalMoveCopyMsgTxn : public nsIFolderListener, public nsMsgTxn
+{
+public:
+    nsLocalMoveCopyMsgTxn();
+    NS_DECL_ISUPPORTS_INHERITED
+    NS_DECL_NSIFOLDERLISTENER
+
+    // overloading nsITransaction methods
+    NS_IMETHOD UndoTransaction(void) override;
+    NS_IMETHOD RedoTransaction(void) override;
+
+    // helper
+    nsresult AddSrcKey(nsMsgKey aKey);
+    nsresult AddSrcStatusOffset(uint32_t statusOffset);
+    nsresult AddDstKey(nsMsgKey aKey);
+    nsresult AddDstMsgSize(uint32_t msgSize);
+    nsresult SetSrcFolder(nsIMsgFolder* srcFolder);
+    nsresult GetSrcIsImap(bool *isImap);
+    nsresult SetDstFolder(nsIMsgFolder* dstFolder);
+    nsresult Init(nsIMsgFolder* srcFolder,
+                  nsIMsgFolder* dstFolder, bool isMove);
+    nsresult UndoImapDeleteFlag(nsIMsgFolder* aFolder,
+                                nsTArray<nsMsgKey>& aKeyArray,
+                                bool deleteFlag);
+    nsresult UndoTransactionInternal();
+    // If the store using this undo transaction can "undelete" a message,
+    // it will call this function on the transaction; This makes undo/redo
+    // easy because message keys don't change after undo/redo. Otherwise,
+    // we need to adjust the src or dst keys after every undo/redo action
+    // to note the new keys.
+    void SetCanUndelete(bool canUndelete) {m_canUndelete = canUndelete;}
+
+private:
+    virtual ~nsLocalMoveCopyMsgTxn();
+    nsWeakPtr m_srcFolder;
+    nsTArray<nsMsgKey> m_srcKeyArray; // used when src is local or imap
+    nsTArray<uint32_t> m_srcStatusOffsetArray; // used when src is local
+    nsWeakPtr m_dstFolder;
+    nsTArray<nsMsgKey> m_dstKeyArray;
+    bool m_isMove;
+    bool m_srcIsImap4;
+    bool m_canUndelete;
+    nsTArray<uint32_t> m_dstSizeArray;
+    bool m_undoing; // if false, re-doing
+    uint32_t m_numHdrsCopied;
+    nsTArray<nsCString> m_copiedMsgIds;
+    nsLocalUndoFolderListener *mUndoFolderListener;
+};
+
+class nsLocalUndoFolderListener : public nsIFolderListener
+{
+public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIFOLDERLISTENER
+
+  nsLocalUndoFolderListener(nsLocalMoveCopyMsgTxn *aTxn, nsIMsgFolder *aFolder);
+
+private:
+  virtual ~nsLocalUndoFolderListener();
+  nsLocalMoveCopyMsgTxn *mTxn;
+  nsIMsgFolder *mFolder;
+};
+
+#endif
diff --git a/mailnews/local/src/nsLocalUtils.cpp b/mailnews/local/src/nsLocalUtils.cpp
new file mode 100644
index 000000000..14a6a2f21
--- /dev/null
+++ b/mailnews/local/src/nsLocalUtils.cpp
@@ -0,0 +1,244 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "msgCore.h"
+#include "nsLocalUtils.h"
+#include "nsIServiceManager.h"
+#include "prsystem.h"
+#include "nsCOMPtr.h"
+#include "prmem.h"
+// stuff for temporary root folder hack
+#include "nsIMsgAccountManager.h"
+#include "nsIMsgIncomingServer.h"
+#include "nsIPop3IncomingServer.h"
+#include "nsINoIncomingServer.h"
+#include "nsMsgBaseCID.h"
+#include "nsComponentManagerUtils.h"
+#include "nsServiceManagerUtils.h"
+
+#include "nsMsgUtils.h"
+#include "nsNetCID.h"
+
+// it would be really cool to:
+// - cache the last hostname->path match
+// - if no such server exists, behave like an old-style mailbox URL
+// (i.e. return the mail.directory preference or something)
+static nsresult
+nsGetMailboxServer(const char *uriStr, nsIMsgIncomingServer** aResult)
+{
+  nsresult rv = NS_OK;
+
+  nsCOMPtr<nsIURL> aUrl = do_CreateInstance(NS_STANDARDURL_CONTRACTID, &rv);
+  if (NS_FAILED(rv)) return rv;
+
+  rv = aUrl->SetSpec(nsDependentCString(uriStr));  
+  if (NS_FAILED(rv)) return rv;
+
+  // retrieve the AccountManager
+  nsCOMPtr<nsIMsgAccountManager> accountManager = 
+    do_GetService(NS_MSGACCOUNTMANAGER_CONTRACTID, &rv);
+  if (NS_FAILED(rv)) return rv;
+  
+  // find all local mail "no servers" matching the given hostname
+  nsCOMPtr<nsIMsgIncomingServer> none_server;
+  aUrl->SetScheme(NS_LITERAL_CSTRING("none"));
+  // No unescaping of username or hostname done here.
+  // The unescaping is done inside of FindServerByURI
+  rv = accountManager->FindServerByURI(aUrl, false,
+                                  getter_AddRefs(none_server));
+  if (NS_SUCCEEDED(rv)) {
+    NS_ADDREF(*aResult = none_server);
+    return rv;
+  }
+  
+  // if that fails, look for the rss hosts matching the given hostname
+  nsCOMPtr<nsIMsgIncomingServer> rss_server;
+  aUrl->SetScheme(NS_LITERAL_CSTRING("rss"));
+  rv = accountManager->FindServerByURI(aUrl, false,
+                                  getter_AddRefs(rss_server));
+  if (NS_SUCCEEDED(rv))
+  {
+     NS_ADDREF(*aResult = rss_server);
+     return rv;
+  }
+#ifdef HAVE_MOVEMAIL
+  // find all movemail "servers" matching the given hostname
+  nsCOMPtr<nsIMsgIncomingServer> movemail_server;
+  aUrl->SetScheme(NS_LITERAL_CSTRING("movemail"));
+  rv = accountManager->FindServerByURI(aUrl, false,
+                                  getter_AddRefs(movemail_server));
+  if (NS_SUCCEEDED(rv)) {
+    NS_ADDREF(*aResult = movemail_server);
+    return rv;
+  }
+#endif /* HAVE_MOVEMAIL */
+
+  // if that fails, look for the pop hosts matching the given hostname
+  nsCOMPtr<nsIMsgIncomingServer> server;
+  if (NS_FAILED(rv)) 
+  {
+    aUrl->SetScheme(NS_LITERAL_CSTRING("pop3"));
+    rv = accountManager->FindServerByURI(aUrl, false,
+                                    getter_AddRefs(server));
+
+    // if we can't find a pop server, maybe it's a local message 
+    // in an imap hierarchy. look for an imap server.
+    if (NS_FAILED(rv)) 
+    {
+      aUrl->SetScheme(NS_LITERAL_CSTRING("imap"));
+      rv = accountManager->FindServerByURI(aUrl, false,
+                                    getter_AddRefs(server));
+    }
+  }
+  if (NS_SUCCEEDED(rv)) 
+  {
+    NS_ADDREF(*aResult = server);
+    return rv;
+  }
+
+// if you fail after looking at all "pop3", "movemail" and "none" servers, you fail.
+return rv;
+}
+
+static nsresult
+nsLocalURI2Server(const char* uriStr,
+                  nsIMsgIncomingServer ** aResult)
+{
+  nsresult rv;
+
+
+  nsCOMPtr<nsIMsgIncomingServer> server;
+  rv = nsGetMailboxServer(uriStr, getter_AddRefs(server));
+
+  NS_IF_ADDREF(*aResult = server);
+
+  return rv;
+}
+
+// given rootURI and rootURI##folder, return on-disk path of folder
+nsresult
+nsLocalURI2Path(const char* rootURI, const char* uriStr,
+                nsCString& pathResult)
+{
+  nsresult rv;
+
+  // verify that rootURI starts with "mailbox:/" or "mailbox-message:/"
+  if ((PL_strcmp(rootURI, kMailboxRootURI) != 0) && 
+      (PL_strcmp(rootURI, kMailboxMessageRootURI) != 0)) {
+    return NS_ERROR_FAILURE;
+  }
+
+  // verify that uristr starts with rooturi
+  nsAutoCString uri(uriStr);
+  if (uri.Find(rootURI) != 0)
+    return NS_ERROR_FAILURE;
+
+
+  nsCOMPtr<nsIMsgIncomingServer> server;
+  rv = nsLocalURI2Server(uriStr, getter_AddRefs(server));
+
+  if (NS_FAILED(rv))
+    return rv;
+
+  // now ask the server what it's root is
+  // and begin pathResult with the mailbox root
+  nsCOMPtr<nsIFile> localPath;
+  rv = server->GetLocalPath(getter_AddRefs(localPath));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCString localNativePath;
+
+  localPath->GetNativePath(localNativePath);
+  nsEscapeNativePath(localNativePath);
+  pathResult = localNativePath.get();
+  const char *curPos = uriStr + PL_strlen(rootURI);
+  if (curPos) {
+    // advance past hostname
+    while ((*curPos)=='/') curPos++;
+    while (*curPos && (*curPos)!='/') curPos++;
+
+    nsAutoCString newPath("");
+
+    // Unescape folder name
+    if (curPos) {
+      nsCString unescapedStr;
+      MsgUnescapeString(nsDependentCString(curPos), 0, unescapedStr);
+      NS_MsgCreatePathStringFromFolderURI(unescapedStr.get(), newPath, NS_LITERAL_CSTRING("none"));
+    } else
+      NS_MsgCreatePathStringFromFolderURI(curPos, newPath, NS_LITERAL_CSTRING("none"));
+
+    pathResult.Append('/');
+    pathResult.Append(newPath);
+  }
+
+  return NS_OK;
+}
+
+/* parses LocalMessageURI
+ * mailbox-message://folder1/folder2#123?header=none or
+ * mailbox-message://folder1/folder2#1234&part=1.2
+ *
+ * puts folder URI in folderURI (mailbox://folder1/folder2)
+ * message key number in key
+ */
+nsresult nsParseLocalMessageURI(const char* uri,
+                                nsCString& folderURI,
+                                nsMsgKey *key)
+{
+  if(!key)
+    return NS_ERROR_NULL_POINTER;
+
+  nsAutoCString uriStr(uri);
+  int32_t keySeparator = uriStr.FindChar('#');
+  if(keySeparator != -1)
+  {
+    int32_t keyEndSeparator = MsgFindCharInSet(uriStr, "?&", keySeparator);
+    folderURI = StringHead(uriStr, keySeparator);
+    folderURI.Cut(7, 8);    // cut out the -message part of mailbox-message:
+
+    nsAutoCString keyStr;
+    if (keyEndSeparator != -1)
+      keyStr = Substring(uriStr, keySeparator + 1,
+                         keyEndSeparator - (keySeparator + 1));
+    else
+      keyStr = StringTail(uriStr, uriStr.Length() - (keySeparator + 1));
+
+    *key = msgKeyFromInt(ParseUint64Str(keyStr.get()));
+    return NS_OK;
+  }
+  return NS_ERROR_FAILURE;
+
+}
+
+nsresult nsBuildLocalMessageURI(const char *baseURI, nsMsgKey key, nsCString& uri)
+{
+  // need to convert mailbox://hostname/.. to mailbox-message://hostname/..
+  uri.Append(baseURI);
+  uri.Append('#');
+  uri.AppendInt(key);
+  return NS_OK;
+}
+
+nsresult nsCreateLocalBaseMessageURI(const nsACString& baseURI, nsCString &baseMessageURI)
+{
+  nsAutoCString tailURI(baseURI);
+
+  // chop off mailbox:/
+  if (tailURI.Find(kMailboxRootURI) == 0)
+    tailURI.Cut(0, PL_strlen(kMailboxRootURI));
+  
+  baseMessageURI = kMailboxMessageRootURI;
+  baseMessageURI += tailURI;
+
+  return NS_OK;
+}
+
+void nsEscapeNativePath(nsCString& nativePath)
+{
+#if defined(XP_WIN)
+  nativePath.Insert('/', 0);
+  MsgReplaceChar(nativePath, '\\', '/');
+#endif
+}
diff --git a/mailnews/local/src/nsLocalUtils.h b/mailnews/local/src/nsLocalUtils.h
new file mode 100644
index 000000000..4419e6baa
--- /dev/null
+++ b/mailnews/local/src/nsLocalUtils.h
@@ -0,0 +1,30 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef NS_LOCALUTILS_H
+#define NS_LOCALUTILS_H
+
+#include "nsStringGlue.h"
+#include "nsIMsgIncomingServer.h"
+
+static const char kMailboxRootURI[] = "mailbox:/";
+static const char kMailboxMessageRootURI[] = "mailbox-message:/";
+
+nsresult
+nsLocalURI2Path(const char* rootURI, const char* uriStr, nsCString& pathResult);
+
+nsresult
+nsParseLocalMessageURI(const char* uri, nsCString& folderURI, nsMsgKey *key);
+
+nsresult 
+nsBuildLocalMessageURI(const char* baseURI, nsMsgKey key, nsCString& uri);
+
+nsresult
+nsCreateLocalBaseMessageURI(const nsACString& baseURI, nsCString &baseMessageURI);
+
+void
+nsEscapeNativePath(nsCString& nativePath);
+
+#endif //NS_LOCALUTILS_H
diff --git a/mailnews/local/src/nsMailboxProtocol.cpp b/mailnews/local/src/nsMailboxProtocol.cpp
new file mode 100644
index 000000000..fad77aa93
--- /dev/null
+++ b/mailnews/local/src/nsMailboxProtocol.cpp
@@ -0,0 +1,725 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "msgCore.h"
+
+#include "nsMailboxProtocol.h"
+#include "nscore.h"
+#include "nsIOutputStream.h"
+#include "nsIInputStreamPump.h"
+#include "nsIMsgDatabase.h"
+#include "nsIMsgHdr.h"
+#include "nsMsgLineBuffer.h"
+#include "nsMsgDBCID.h"
+#include "nsIMsgMailNewsUrl.h"
+#include "nsICopyMsgStreamListener.h"
+#include "nsMsgMessageFlags.h"
+#include "prtime.h"
+#include "mozilla/Logging.h"
+#include "prerror.h"
+#include "prprf.h"
+#include "nspr.h"
+
+PRLogModuleInfo *MAILBOX;
+#include "nsIFileStreams.h"
+#include "nsIStreamTransportService.h"
+#include "nsIStreamConverterService.h"
+#include "nsIIOService.h"
+#include "nsNetUtil.h"
+#include "nsMsgUtils.h"
+#include "nsIMsgWindow.h"
+#include "nsIMimeHeaders.h"
+#include "nsIMsgPluggableStore.h"
+#include "nsISeekableStream.h"
+
+#include "nsIMsgMdnGenerator.h"
+
+/* the output_buffer_size must be larger than the largest possible line
+ * 2000 seems good for news
+ *
+ * jwz: I increased this to 4k since it must be big enough to hold the
+ * entire button-bar HTML, and with the new "mailto" format, that can
+ * contain arbitrarily long header fields like "references".
+ *
+ * fortezza: proxy auth is huge, buffer increased to 8k (sigh).
+ */
+#define OUTPUT_BUFFER_SIZE (4096*2)
+
+nsMailboxProtocol::nsMailboxProtocol(nsIURI * aURI)
+    : nsMsgProtocol(aURI)
+{
+  m_lineStreamBuffer =nullptr;
+
+  // initialize the pr log if it hasn't been initialiezed already
+  if (!MAILBOX)
+    MAILBOX = PR_NewLogModule("MAILBOX");
+}
+
+nsMailboxProtocol::~nsMailboxProtocol()
+{
+  // free our local state
+  delete m_lineStreamBuffer;
+}
+
+nsresult nsMailboxProtocol::OpenMultipleMsgTransport(uint64_t offset, int32_t size)
+{
+  nsresult rv;
+
+  nsCOMPtr<nsIStreamTransportService> serv =
+      do_GetService(NS_STREAMTRANSPORTSERVICE_CONTRACTID, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // XXX 64-bit
+  rv = serv->CreateInputTransport(m_multipleMsgMoveCopyStream, int64_t(offset),
+                                  int64_t(size), false,
+                                  getter_AddRefs(m_transport));
+
+  return rv;
+}
+
+nsresult nsMailboxProtocol::Initialize(nsIURI * aURL)
+{
+  NS_PRECONDITION(aURL, "invalid URL passed into MAILBOX Protocol");
+  nsresult rv = NS_OK;
+  if (aURL)
+  {
+    rv = aURL->QueryInterface(NS_GET_IID(nsIMailboxUrl), (void **) getter_AddRefs(m_runningUrl));
+    if (NS_SUCCEEDED(rv) && m_runningUrl)
+    {
+      nsCOMPtr <nsIMsgWindow> window;
+      rv = m_runningUrl->GetMailboxAction(&m_mailboxAction);
+      // clear stopped flag on msg window, because we care.
+      nsCOMPtr <nsIMsgMailNewsUrl> mailnewsUrl = do_QueryInterface(m_runningUrl);
+      if (mailnewsUrl)
+      {
+        mailnewsUrl->GetMsgWindow(getter_AddRefs(window));
+        if (window)
+          window->SetStopped(false);
+      }
+
+      if (m_mailboxAction == nsIMailboxUrl::ActionParseMailbox)
+      {
+        // Set the length of the file equal to the max progress
+        nsCOMPtr<nsIFile> file;
+        GetFileFromURL(aURL, getter_AddRefs(file));
+        if (file)
+        {
+          int64_t fileSize = 0;
+          file->GetFileSize(&fileSize);
+          mailnewsUrl->SetMaxProgress(fileSize);
+        }
+
+        rv = OpenFileSocket(aURL, 0, -1 /* read in all the bytes in the file */);
+      }
+      else
+      {
+        // we need to specify a byte range to read in so we read in JUST the message we want.
+        rv = SetupMessageExtraction();
+        if (NS_FAILED(rv)) return rv;
+        uint32_t aMsgSize = 0;
+        rv = m_runningUrl->GetMessageSize(&aMsgSize);
+        NS_ASSERTION(NS_SUCCEEDED(rv), "oops....i messed something up");
+        SetContentLength(aMsgSize);
+        mailnewsUrl->SetMaxProgress(aMsgSize);
+
+        if (RunningMultipleMsgUrl())
+        {
+          // if we're running multiple msg url, we clear the event sink because the multiple
+          // msg urls will handle setting the progress.
+          mProgressEventSink = nullptr;
+        }
+
+        nsCOMPtr<nsIMsgMessageUrl> msgUrl = do_QueryInterface(m_runningUrl, &rv);
+        if (NS_SUCCEEDED(rv))
+        {
+          nsCOMPtr<nsIMsgFolder> folder;
+          nsCOMPtr<nsIMsgDBHdr> msgHdr;
+          rv = msgUrl->GetMessageHeader(getter_AddRefs(msgHdr));
+          if (NS_SUCCEEDED(rv) && msgHdr)
+          {
+            rv = msgHdr->GetFolder(getter_AddRefs(folder));
+            if (NS_SUCCEEDED(rv) && folder)
+            {
+              nsCOMPtr<nsIInputStream> stream;
+              int64_t offset = 0;
+              bool reusable = false;
+
+              rv = folder->GetMsgInputStream(msgHdr, &reusable, getter_AddRefs(stream));
+              NS_ENSURE_SUCCESS(rv, rv);
+              nsCOMPtr<nsISeekableStream> seekableStream(do_QueryInterface(stream, &rv));
+              NS_ENSURE_SUCCESS(rv, rv);
+              seekableStream->Tell(&offset);
+              // create input stream transport
+              nsCOMPtr<nsIStreamTransportService> sts =
+                  do_GetService(NS_STREAMTRANSPORTSERVICE_CONTRACTID, &rv);
+              if (NS_FAILED(rv)) return rv;
+              m_readCount = aMsgSize;
+              // Save the stream for reuse, but only for multiple URLs.
+              if (reusable && RunningMultipleMsgUrl())
+                m_multipleMsgMoveCopyStream = stream;
+              else
+                reusable = false;
+              rv = sts->CreateInputTransport(stream, offset,
+                                             int64_t(aMsgSize), !reusable,
+                                             getter_AddRefs(m_transport));
+
+              m_socketIsOpen = false;
+            }
+          }
+          if (!folder) // must be a .eml file
+            rv = OpenFileSocket(aURL, 0, aMsgSize);
+        }
+        NS_ASSERTION(NS_SUCCEEDED(rv), "oops....i messed something up");
+      }
+    }
+  }
+
+  m_lineStreamBuffer = new nsMsgLineStreamBuffer(OUTPUT_BUFFER_SIZE, true);
+
+  m_nextState = MAILBOX_READ_FOLDER;
+  m_initialState = MAILBOX_READ_FOLDER;
+  mCurrentProgress = 0;
+
+  // do we really need both?
+  m_tempMessageFile = m_tempMsgFile;
+  return rv;
+}
+
+/////////////////////////////////////////////////////////////////////////////////////////////
+// we suppport the nsIStreamListener interface
+////////////////////////////////////////////////////////////////////////////////////////////
+
+NS_IMETHODIMP nsMailboxProtocol::OnStartRequest(nsIRequest *request, nsISupports *ctxt)
+{
+  // extract the appropriate event sinks from the url and initialize them in our protocol data
+  // the URL should be queried for a nsINewsURL. If it doesn't support a news URL interface then
+  // we have an error.
+  if (m_nextState == MAILBOX_READ_FOLDER && m_mailboxParser)
+  {
+    // we need to inform our mailbox parser that it's time to start...
+    m_mailboxParser->OnStartRequest(request, ctxt);
+  }
+  return nsMsgProtocol::OnStartRequest(request, ctxt);
+}
+
+bool nsMailboxProtocol::RunningMultipleMsgUrl()
+{
+  if (m_mailboxAction == nsIMailboxUrl::ActionCopyMessage || m_mailboxAction == nsIMailboxUrl::ActionMoveMessage)
+  {
+    uint32_t numMoveCopyMsgs;
+    nsresult rv = m_runningUrl->GetNumMoveCopyMsgs(&numMoveCopyMsgs);
+    if (NS_SUCCEEDED(rv) && numMoveCopyMsgs > 1)
+      return true;
+  }
+  return false;
+}
+
+// stop binding is a "notification" informing us that the stream associated with aURL is going away.
+NS_IMETHODIMP nsMailboxProtocol::OnStopRequest(nsIRequest *request, nsISupports *ctxt, nsresult aStatus)
+{
+  nsresult rv;
+  if (m_nextState == MAILBOX_READ_FOLDER && m_mailboxParser)
+  {
+    // we need to inform our mailbox parser that there is no more incoming data...
+    m_mailboxParser->OnStopRequest(request, ctxt, aStatus);
+  }
+  else if (m_nextState == MAILBOX_READ_MESSAGE)
+  {
+    DoneReadingMessage();
+  }
+  // I'm not getting cancel status - maybe the load group still has the status.
+  bool stopped = false;
+  if (m_runningUrl)
+  {
+    nsCOMPtr <nsIMsgMailNewsUrl> mailnewsUrl = do_QueryInterface(m_runningUrl);
+    if (mailnewsUrl)
+    {
+      nsCOMPtr <nsIMsgWindow> window;
+      mailnewsUrl->GetMsgWindow(getter_AddRefs(window));
+      if (window)
+        window->GetStopped(&stopped);
+    }
+
+    if (!stopped && NS_SUCCEEDED(aStatus) && (m_mailboxAction == nsIMailboxUrl::ActionCopyMessage || m_mailboxAction == nsIMailboxUrl::ActionMoveMessage))
+    {
+      uint32_t numMoveCopyMsgs;
+      uint32_t curMoveCopyMsgIndex;
+      rv = m_runningUrl->GetNumMoveCopyMsgs(&numMoveCopyMsgs);
+      if (NS_SUCCEEDED(rv) && numMoveCopyMsgs > 0)
+      {
+        m_runningUrl->GetCurMoveCopyMsgIndex(&curMoveCopyMsgIndex);
+        if (++curMoveCopyMsgIndex < numMoveCopyMsgs)
+        {
+          if (!mSuppressListenerNotifications && m_channelListener)
+          {
+            nsCOMPtr<nsICopyMessageStreamListener> listener = do_QueryInterface(m_channelListener, &rv);
+            if (listener)
+            {
+              listener->EndCopy(ctxt, aStatus);
+              listener->StartMessage(); // start next message.
+            }
+          }
+          m_runningUrl->SetCurMoveCopyMsgIndex(curMoveCopyMsgIndex);
+          nsCOMPtr <nsIMsgDBHdr> nextMsg;
+          rv = m_runningUrl->GetMoveCopyMsgHdrForIndex(curMoveCopyMsgIndex, getter_AddRefs(nextMsg));
+          if (NS_SUCCEEDED(rv) && nextMsg)
+          {
+            uint32_t msgSize = 0;
+            nsCOMPtr <nsIMsgFolder> msgFolder;
+            nextMsg->GetFolder(getter_AddRefs(msgFolder));
+            NS_ASSERTION(msgFolder, "couldn't get folder for next msg in multiple msg local copy");
+            if (msgFolder)
+            {
+              nsCString uri;
+              msgFolder->GetUriForMsg(nextMsg, uri);
+              nsCOMPtr<nsIMsgMessageUrl> msgUrl = do_QueryInterface(m_runningUrl);
+              if (msgUrl)
+              {
+                msgUrl->SetOriginalSpec(uri.get());
+                msgUrl->SetUri(uri.get());
+
+                uint64_t msgOffset;
+                nextMsg->GetMessageOffset(&msgOffset);
+                nextMsg->GetMessageSize(&msgSize);
+                // now we have to seek to the right position in the file and
+                // basically re-initialize the transport with the correct message size.
+                // then, we have to make sure the url keeps running somehow.
+                nsCOMPtr<nsISupports> urlSupports = do_QueryInterface(m_runningUrl);
+                //
+                // put us in a state where we are always notified of incoming data
+                //
+
+                m_transport = nullptr; // open new stream transport
+                m_inputStream = nullptr;
+                m_outputStream = nullptr;
+
+                if (m_multipleMsgMoveCopyStream)
+                {
+                  rv = OpenMultipleMsgTransport(msgOffset, msgSize);
+                }
+                else
+                {
+                  nsCOMPtr<nsIInputStream> stream;
+                  bool reusable = false;
+                  rv = msgFolder->GetMsgInputStream(nextMsg, &reusable,
+                                                    getter_AddRefs(stream));
+                  NS_ASSERTION(!reusable, "We thought streams were not reusable!");
+
+                  if (NS_SUCCEEDED(rv))
+                  {
+                    // create input stream transport
+                    nsCOMPtr<nsIStreamTransportService> sts =
+                        do_GetService(NS_STREAMTRANSPORTSERVICE_CONTRACTID, &rv);
+
+                    if (NS_SUCCEEDED(rv))
+                    {
+                      m_readCount = msgSize;
+                      rv = sts->CreateInputTransport(stream, msgOffset,
+                                                     int64_t(msgSize), true,
+                                                     getter_AddRefs(m_transport));
+                    }
+                  }
+                }
+
+                if (NS_SUCCEEDED(rv))
+                {
+                  if (!m_inputStream)
+                    rv = m_transport->OpenInputStream(0, 0, 0, getter_AddRefs(m_inputStream));
+
+                  if (NS_SUCCEEDED(rv))
+                  {
+                    nsCOMPtr<nsIInputStreamPump> pump;
+                    rv = NS_NewInputStreamPump(getter_AddRefs(pump), m_inputStream);
+                    if (NS_SUCCEEDED(rv)) {
+                      rv = pump->AsyncRead(this, urlSupports);
+                      if (NS_SUCCEEDED(rv))
+                        m_request = pump;
+                    }
+                  }
+                }
+
+                NS_ASSERTION(NS_SUCCEEDED(rv), "AsyncRead failed");
+                if (m_loadGroup)
+                  m_loadGroup->RemoveRequest(static_cast<nsIRequest *>(this), nullptr, aStatus);
+                m_socketIsOpen = true; // mark the channel as open
+                return aStatus;
+              }
+            }
+          }
+        }
+        else
+        {
+        }
+      }
+    }
+  }
+  // and we want to mark ourselves for deletion or some how inform our protocol manager that we are
+  // available for another url if there is one.
+
+  // mscott --> maybe we should set our state to done because we don't run multiple urls in a mailbox
+  // protocol connection....
+  m_nextState = MAILBOX_DONE;
+
+  // the following is for smoke test purposes. QA is looking at this "Mailbox Done" string which
+  // is printed out to the console and determining if the mail app loaded up correctly...obviously
+  // this solution is not very good so we should look at something better, but don't remove this
+  // line before talking to me (mscott) and mailnews QA....
+
+  MOZ_LOG(MAILBOX, mozilla::LogLevel::Info, ("Mailbox Done\n"));
+
+  // when on stop binding is called, we as the protocol are done...let's close down the connection
+  // releasing all of our interfaces. It's important to remember that this on stop binding call
+  // is coming from netlib so they are never going to ping us again with on data available. This means
+  // we'll never be going through the Process loop...
+
+  if (m_multipleMsgMoveCopyStream)
+  {
+    m_multipleMsgMoveCopyStream->Close();
+    m_multipleMsgMoveCopyStream = nullptr;
+  }
+  nsMsgProtocol::OnStopRequest(request, ctxt, aStatus);
+  return CloseSocket();
+}
+
+/////////////////////////////////////////////////////////////////////////////////////////////
+// End of nsIStreamListenerSupport
+//////////////////////////////////////////////////////////////////////////////////////////////
+
+nsresult nsMailboxProtocol::DoneReadingMessage()
+{
+  nsresult rv = NS_OK;
+  // and close the article file if it was open....
+
+  if (m_mailboxAction == nsIMailboxUrl::ActionSaveMessageToDisk && m_msgFileOutputStream)
+    rv = m_msgFileOutputStream->Close();
+
+  return rv;
+}
+
+nsresult nsMailboxProtocol::SetupMessageExtraction()
+{
+  // Determine the number of bytes we are going to need to read out of the
+  // mailbox url....
+  nsCOMPtr<nsIMsgDBHdr> msgHdr;
+  nsresult rv = NS_OK;
+
+  NS_ASSERTION(m_runningUrl, "Not running a url");
+  if (m_runningUrl)
+  {
+    uint32_t messageSize = 0;
+    m_runningUrl->GetMessageSize(&messageSize);
+    if (!messageSize)
+    {
+      nsCOMPtr<nsIMsgMessageUrl> msgUrl = do_QueryInterface(m_runningUrl, &rv);
+      NS_ENSURE_SUCCESS(rv,rv);
+      rv = msgUrl->GetMessageHeader(getter_AddRefs(msgHdr));
+      if (NS_SUCCEEDED(rv) && msgHdr)
+      {
+        msgHdr->GetMessageSize(&messageSize);
+        m_runningUrl->SetMessageSize(messageSize);
+        msgHdr->GetMessageOffset(&m_msgOffset);
+      }
+      else
+        NS_ASSERTION(false, "couldn't get message header");
+    }
+  }
+  return rv;
+}
+
+/////////////////////////////////////////////////////////////////////////////////////////////
+// Begin protocol state machine functions...
+//////////////////////////////////////////////////////////////////////////////////////////////
+
+nsresult nsMailboxProtocol::LoadUrl(nsIURI * aURL, nsISupports * aConsumer)
+{
+  nsresult rv = NS_OK;
+  // if we were already initialized with a consumer, use it...
+  nsCOMPtr<nsIStreamListener> consumer = do_QueryInterface(aConsumer);
+  if (consumer)
+    m_channelListener = consumer;
+
+  if (aURL)
+  {
+    m_runningUrl = do_QueryInterface(aURL);
+    if (m_runningUrl)
+    {
+      // find out from the url what action we are supposed to perform...
+      rv = m_runningUrl->GetMailboxAction(&m_mailboxAction);
+
+      bool convertData = false;
+
+      // need to check if we're fetching an rfc822 part in order to
+      // quote a message.
+      if (m_mailboxAction == nsIMailboxUrl::ActionFetchMessage)
+      {
+        nsCOMPtr<nsIMsgMailNewsUrl> msgUrl = do_QueryInterface(m_runningUrl, &rv);
+        NS_ENSURE_SUCCESS(rv,rv);
+
+        nsAutoCString queryStr;
+        rv = msgUrl->GetQuery(queryStr);
+        NS_ENSURE_SUCCESS(rv,rv);
+
+        // check if this is a filter plugin requesting the message.
+        // in that case, set up a text converter
+        convertData = (queryStr.Find("header=filter") != -1 ||
+                       queryStr.Find("header=attach") != -1);
+      }
+      else if (m_mailboxAction == nsIMailboxUrl::ActionFetchPart)
+      {
+        // when fetching a part, we need to insert a converter into the listener chain order to
+        // force just the part out of the message. Our channel listener is the consumer we'll
+        // pass in to AsyncConvertData.
+        convertData = true;
+        consumer = m_channelListener;
+      }
+      if (convertData)
+      {
+          nsCOMPtr<nsIStreamConverterService> streamConverter = do_GetService("@mozilla.org/streamConverters;1", &rv);
+          NS_ENSURE_SUCCESS(rv, rv);
+          nsCOMPtr <nsIStreamListener> conversionListener;
+          nsCOMPtr<nsIChannel> channel;
+          QueryInterface(NS_GET_IID(nsIChannel), getter_AddRefs(channel));
+
+          rv = streamConverter->AsyncConvertData("message/rfc822",
+                                                 "*/*",
+                                                 consumer, channel, getter_AddRefs(m_channelListener));
+      }
+
+      if (NS_SUCCEEDED(rv))
+      {
+        switch (m_mailboxAction)
+        {
+        case nsIMailboxUrl::ActionParseMailbox:
+          // extract the mailbox parser..
+          rv = m_runningUrl->GetMailboxParser(getter_AddRefs(m_mailboxParser));
+          m_nextState = MAILBOX_READ_FOLDER;
+          break;
+        case nsIMailboxUrl::ActionSaveMessageToDisk:
+          // ohhh, display message already writes a msg to disk (as part of a hack)
+          // so we can piggy back off of that!! We just need to change m_tempMessageFile
+          // to be the name of our save message to disk file. Since save message to disk
+          // urls are run without a docshell to display the msg into, we won't be trying
+          // to display the message after we write it to disk...
+          {
+            nsCOMPtr<nsIMsgMessageUrl> messageUrl = do_QueryInterface(m_runningUrl, &rv);
+            if (NS_SUCCEEDED(rv))
+            {
+              messageUrl->GetMessageFile(getter_AddRefs(m_tempMessageFile));
+              rv = MsgNewBufferedFileOutputStream(getter_AddRefs(m_msgFileOutputStream), m_tempMessageFile, -1, 00600);
+              NS_ENSURE_SUCCESS(rv, rv);
+
+              bool addDummyEnvelope = false;
+              messageUrl->GetAddDummyEnvelope(&addDummyEnvelope);
+              if (addDummyEnvelope)
+                SetFlag(MAILBOX_MSG_PARSE_FIRST_LINE);
+              else
+                ClearFlag(MAILBOX_MSG_PARSE_FIRST_LINE);
+            }
+          }
+          m_nextState = MAILBOX_READ_MESSAGE;
+          break;
+        case nsIMailboxUrl::ActionCopyMessage:
+        case nsIMailboxUrl::ActionMoveMessage:
+        case nsIMailboxUrl::ActionFetchMessage:
+          ClearFlag(MAILBOX_MSG_PARSE_FIRST_LINE);
+          m_nextState = MAILBOX_READ_MESSAGE;
+          break;
+        case nsIMailboxUrl::ActionFetchPart:
+            m_nextState = MAILBOX_READ_MESSAGE;
+            break;
+        default:
+          break;
+        }
+      }
+
+      rv = nsMsgProtocol::LoadUrl(aURL, m_channelListener);
+
+    } // if we received an MAILBOX url...
+  } // if we received a url!
+
+  return rv;
+}
+
+int32_t nsMailboxProtocol::ReadFolderResponse(nsIInputStream * inputStream, uint64_t sourceOffset, uint32_t length)
+{
+  // okay we are doing a folder read in 8K chunks of a mail folder....
+  // this is almost too easy....we can just forward the data in this stream on to our
+  // folder parser object!!!
+
+  nsresult rv = NS_OK;
+  mCurrentProgress += length;
+
+  if (m_mailboxParser)
+  {
+    nsCOMPtr <nsIURI> url = do_QueryInterface(m_runningUrl);
+    rv = m_mailboxParser->OnDataAvailable(nullptr, url, inputStream, sourceOffset, length); // let the parser deal with it...
+  }
+  if (NS_FAILED(rv))
+  {
+    m_nextState = MAILBOX_ERROR_DONE; // drop out of the loop....
+    return -1;
+  }
+
+  // now wait for the next 8K chunk to come in.....
+  SetFlag(MAILBOX_PAUSE_FOR_READ);
+
+  // leave our state alone so when the next chunk of the mailbox comes in we jump to this state
+  // and repeat....how does this process end? Well when the file is done being read in, core net lib
+  // will issue an ::OnStopRequest to us...we'll use that as our sign to drop out of this state and to
+  // close the protocol instance...
+
+  return 0;
+}
+
+int32_t nsMailboxProtocol::ReadMessageResponse(nsIInputStream * inputStream, uint64_t sourceOffset, uint32_t length)
+{
+  char *line = nullptr;
+  uint32_t status = 0;
+  nsresult rv = NS_OK;
+  mCurrentProgress += length;
+
+  // if we are doing a move or a copy, forward the data onto the copy handler...
+  // if we want to display the message then parse the incoming data...
+
+  if (m_channelListener)
+  {
+    // just forward the data we read in to the listener...
+    rv = m_channelListener->OnDataAvailable(this, m_channelContext, inputStream, sourceOffset, length);
+  }
+  else
+  {
+    bool pauseForMoreData = false;
+    bool canonicalLineEnding = false;
+    nsCOMPtr<nsIMsgMessageUrl> msgurl = do_QueryInterface(m_runningUrl);
+
+    if (msgurl)
+      msgurl->GetCanonicalLineEnding(&canonicalLineEnding);
+
+    while ((line = m_lineStreamBuffer->ReadNextLine(inputStream, status, pauseForMoreData)) &&
+           !pauseForMoreData)
+    {
+      /* When we're sending this line to a converter (ie,
+      it's a message/rfc822) use the local line termination
+      convention, not CRLF.  This makes text articles get
+      saved with the local line terminators.  Since SMTP
+      and NNTP mandate the use of CRLF, it is expected that
+      the local system will convert that to the local line
+      terminator as it is read.
+      */
+      // mscott - the firstline hack is aimed at making sure we don't write
+      // out the dummy header when we are trying to display the message.
+      // The dummy header is the From line with the date tag on it.
+      if (m_msgFileOutputStream && TestFlag(MAILBOX_MSG_PARSE_FIRST_LINE))
+      {
+        uint32_t count = 0;
+        rv = m_msgFileOutputStream->Write(line, PL_strlen(line), &count);
+        if (NS_FAILED(rv))
+          break;
+
+        if (canonicalLineEnding)
+          rv = m_msgFileOutputStream->Write(CRLF, 2, &count);
+        else
+          rv = m_msgFileOutputStream->Write(MSG_LINEBREAK,
+                                            MSG_LINEBREAK_LEN, &count);
+
+        if (NS_FAILED(rv))
+          break;
+      }
+      else
+        SetFlag(MAILBOX_MSG_PARSE_FIRST_LINE);
+      PR_Free(line);
+    }
+    PR_Free(line);
+  }
+
+  SetFlag(MAILBOX_PAUSE_FOR_READ); // wait for more data to become available...
+  if (mProgressEventSink && m_runningUrl)
+  {
+    int64_t maxProgress;
+    nsCOMPtr<nsIMsgMailNewsUrl> mailnewsUrl(do_QueryInterface(m_runningUrl));
+    mailnewsUrl->GetMaxProgress(&maxProgress);
+    mProgressEventSink->OnProgress(this, m_channelContext,
+                                   mCurrentProgress,
+                                   maxProgress);
+  }
+
+  if (NS_FAILED(rv)) return -1;
+
+  return 0;
+}
+
+
+/*
+ * returns negative if the transfer is finished or error'd out
+ *
+ * returns zero or more if the transfer needs to be continued.
+ */
+nsresult nsMailboxProtocol::ProcessProtocolState(nsIURI * url, nsIInputStream * inputStream, uint64_t offset, uint32_t length)
+{
+  nsresult rv = NS_OK;
+  int32_t status = 0;
+  ClearFlag(MAILBOX_PAUSE_FOR_READ); /* already paused; reset */
+
+  while(!TestFlag(MAILBOX_PAUSE_FOR_READ))
+  {
+
+    switch(m_nextState)
+    {
+    case MAILBOX_READ_MESSAGE:
+      if (inputStream == nullptr)
+        SetFlag(MAILBOX_PAUSE_FOR_READ);
+      else
+        status = ReadMessageResponse(inputStream, offset, length);
+      break;
+    case MAILBOX_READ_FOLDER:
+      if (inputStream == nullptr)
+        SetFlag(MAILBOX_PAUSE_FOR_READ);   // wait for file socket to read in the next chunk...
+      else
+        status = ReadFolderResponse(inputStream, offset, length);
+      break;
+    case MAILBOX_DONE:
+    case MAILBOX_ERROR_DONE:
+      {
+        nsCOMPtr <nsIMsgMailNewsUrl> anotherUrl = do_QueryInterface(m_runningUrl);
+        rv = m_nextState == MAILBOX_DONE ? NS_OK : NS_ERROR_FAILURE;
+        anotherUrl->SetUrlState(false, rv);
+        m_nextState = MAILBOX_FREE;
+      }
+      break;
+
+    case MAILBOX_FREE:
+      // MAILBOX is a one time use connection so kill it if we get here...
+      CloseSocket();
+      return rv; /* final end */
+
+    default: /* should never happen !!! */
+      m_nextState = MAILBOX_ERROR_DONE;
+      break;
+    }
+
+    /* check for errors during load and call error
+    * state if found
+    */
+    if(status < 0 && m_nextState != MAILBOX_FREE)
+    {
+      m_nextState = MAILBOX_ERROR_DONE;
+      /* don't exit! loop around again and do the free case */
+      ClearFlag(MAILBOX_PAUSE_FOR_READ);
+    }
+  } /* while(!MAILBOX_PAUSE_FOR_READ) */
+
+  return rv;
+}
+
+nsresult nsMailboxProtocol::CloseSocket()
+{
+  // how do you force a release when closing the connection??
+  nsMsgProtocol::CloseSocket();
+  m_runningUrl = nullptr;
+  m_mailboxParser = nullptr;
+  return NS_OK;
+}
+
+// vim: ts=2 sw=2
diff --git a/mailnews/local/src/nsMailboxProtocol.h b/mailnews/local/src/nsMailboxProtocol.h
new file mode 100644
index 000000000..53c65b40f
--- /dev/null
+++ b/mailnews/local/src/nsMailboxProtocol.h
@@ -0,0 +1,125 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsMailboxProtocol_h___
+#define nsMailboxProtocol_h___
+
+#include "mozilla/Attributes.h"
+#include "nsMsgProtocol.h"
+#include "nsCOMPtr.h"
+#include "nsIFile.h"
+#include "nsIChannel.h"
+#include "nsIInputStreamPump.h"
+#include "nsIOutputStream.h"
+#include "nsIMailboxUrl.h"
+// State Flags (Note, I use the word state in terms of storing
+// state information about the connection (authentication, have we sent
+// commands, etc. I do not intend it to refer to protocol state)
+
+#define MAILBOX_PAUSE_FOR_READ      0x00000001  /* should we pause for the next read */
+#define MAILBOX_MSG_PARSE_FIRST_LINE    0x00000002 /* have we read in the first line of the msg */
+
+/* states of the machine
+ */
+typedef enum _MailboxStatesEnum {
+  MAILBOX_READ_FOLDER,
+  MAILBOX_FINISH_OPEN_FOLDER,
+  MAILBOX_OPEN_MESSAGE,
+  MAILBOX_OPEN_STREAM,
+  MAILBOX_READ_MESSAGE,
+  MAILBOX_COMPRESS_FOLDER,
+  MAILBOX_FINISH_COMPRESS_FOLDER,
+  MAILBOX_BACKGROUND,
+  MAILBOX_NULL,
+  MAILBOX_NULL2,
+  MAILBOX_DELIVER_QUEUED,
+  MAILBOX_FINISH_DELIVER_QUEUED,
+  MAILBOX_DONE,
+  MAILBOX_ERROR_DONE,
+  MAILBOX_FREE,
+  MAILBOX_COPY_MESSAGES,
+  MAILBOX_FINISH_COPY_MESSAGES
+} MailboxStatesEnum;
+
+class nsMsgLineStreamBuffer;
+
+class nsMailboxProtocol : public nsMsgProtocol
+{
+public:
+  // Creating a protocol instance requires the URL which needs to be run AND it requires
+  // a transport layer.
+  nsMailboxProtocol(nsIURI * aURL);
+  virtual ~nsMailboxProtocol();
+
+  // initialization function given a new url and transport layer
+  nsresult Initialize(nsIURI * aURL);
+
+  // the consumer of the url might be something like an nsIDocShell....
+  virtual nsresult LoadUrl(nsIURI * aURL, nsISupports * aConsumer) override;
+
+  ////////////////////////////////////////////////////////////////////////////////////////
+  // we suppport the nsIStreamListener interface
+  ////////////////////////////////////////////////////////////////////////////////////////
+
+  NS_IMETHOD OnStartRequest(nsIRequest *request, nsISupports *ctxt) override;
+  NS_IMETHOD OnStopRequest(nsIRequest *request, nsISupports *ctxt, nsresult aStatus) override;
+
+private:
+  nsCOMPtr<nsIMailboxUrl>  m_runningUrl; // the nsIMailboxURL that is currently running
+  nsMailboxAction m_mailboxAction; // current mailbox action associated with this connnection...
+  uint64_t m_msgOffset;
+  // Event sink handles
+  nsCOMPtr<nsIStreamListener> m_mailboxParser;
+
+  // Local state for the current operation
+  nsMsgLineStreamBuffer   * m_lineStreamBuffer; // used to efficiently extract lines from the incoming data stream
+
+  // Generic state information -- What state are we in? What state do we want to go to
+  // after the next response? What was the last response code? etc.
+  MailboxStatesEnum  m_nextState;
+  MailboxStatesEnum  m_initialState;
+
+  int64_t   mCurrentProgress;
+
+        // can we just use the base class m_tempMsgFile?
+  nsCOMPtr<nsIFile> m_tempMessageFile;
+        nsCOMPtr<nsIOutputStream> m_msgFileOutputStream;
+
+  // this is used to hold the source mailbox file open when move/copying
+  // multiple messages.
+  nsCOMPtr<nsIInputStream> m_multipleMsgMoveCopyStream;
+
+  virtual nsresult ProcessProtocolState(nsIURI * url, nsIInputStream * inputStream,
+                                        uint64_t sourceOffset, uint32_t length) override;
+  virtual nsresult CloseSocket() override;
+
+  nsresult SetupMessageExtraction();
+  nsresult OpenMultipleMsgTransport(uint64_t offset, int32_t size);
+  bool RunningMultipleMsgUrl();
+
+  ////////////////////////////////////////////////////////////////////////////////////////
+  // Protocol Methods --> This protocol is state driven so each protocol method is
+  //            designed to re-act to the current "state". I've attempted to
+  //            group them together based on functionality.
+  ////////////////////////////////////////////////////////////////////////////////////////
+
+  // When parsing a mailbox folder in chunks, this protocol state reads in the current chunk
+  // and forwards it to the mailbox parser.
+  int32_t ReadFolderResponse(nsIInputStream * inputStream, uint64_t sourceOffset, uint32_t length);
+  int32_t ReadMessageResponse(nsIInputStream * inputStream, uint64_t sourceOffset, uint32_t length);
+  nsresult DoneReadingMessage();
+
+  ////////////////////////////////////////////////////////////////////////////////////////
+  // End of Protocol Methods
+  ////////////////////////////////////////////////////////////////////////////////////////
+};
+
+#endif  // nsMailboxProtocol_h___
+
+
+
+
+
+
diff --git a/mailnews/local/src/nsMailboxServer.cpp b/mailnews/local/src/nsMailboxServer.cpp
new file mode 100644
index 000000000..005204f0d
--- /dev/null
+++ b/mailnews/local/src/nsMailboxServer.cpp
@@ -0,0 +1,33 @@
+/**
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsMailboxServer.h"
+#include "nsLocalMailFolder.h"
+
+NS_IMETHODIMP
+nsMailboxServer::GetLocalStoreType(nsACString& type)
+{
+  type.AssignLiteral("mailbox");
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsMailboxServer::GetLocalDatabaseType(nsACString& type)
+{
+  type.AssignLiteral("mailbox");
+  return NS_OK;
+}
+
+nsresult
+nsMailboxServer::CreateRootFolderFromUri(const nsCString &serverUri,
+                                         nsIMsgFolder **rootFolder)
+{
+  nsMsgLocalMailFolder *newRootFolder = new nsMsgLocalMailFolder;
+  if (!newRootFolder)
+    return NS_ERROR_OUT_OF_MEMORY;
+  NS_ADDREF(*rootFolder = newRootFolder);
+  newRootFolder->Init(serverUri.get());
+  return NS_OK;
+}
diff --git a/mailnews/local/src/nsMailboxServer.h b/mailnews/local/src/nsMailboxServer.h
new file mode 100644
index 000000000..70e914f52
--- /dev/null
+++ b/mailnews/local/src/nsMailboxServer.h
@@ -0,0 +1,22 @@
+/**
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsMailboxServer_h__
+#define nsMailboxServer_h__
+
+#include "mozilla/Attributes.h"
+#include "nsMsgIncomingServer.h"
+
+class nsMailboxServer : public nsMsgIncomingServer
+{
+public:
+  NS_IMETHOD GetLocalStoreType(nsACString& type) override;
+  NS_IMETHOD GetLocalDatabaseType(nsACString& type) override;
+protected:
+  virtual nsresult CreateRootFolderFromUri(const nsCString &serverUri,
+                                           nsIMsgFolder **rootFolder) override;
+};
+
+#endif
diff --git a/mailnews/local/src/nsMailboxService.cpp b/mailnews/local/src/nsMailboxService.cpp
new file mode 100644
index 000000000..00a0d87c8
--- /dev/null
+++ b/mailnews/local/src/nsMailboxService.cpp
@@ -0,0 +1,677 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "msgCore.h"    // precompiled header...
+#include "nsCOMPtr.h"
+
+#include "nsMailboxService.h"
+#include "nsMailboxUrl.h"
+#include "nsIMsgMailNewsUrl.h"
+#include "nsMailboxProtocol.h"
+#include "nsIMsgDatabase.h"
+#include "nsMsgDBCID.h"
+#include "MailNewsTypes.h"
+#include "nsTArray.h"
+#include "nsLocalUtils.h"
+#include "nsMsgLocalCID.h"
+#include "nsMsgBaseCID.h"
+#include "nsIDocShell.h"
+#include "nsIPop3Service.h"
+#include "nsMsgUtils.h"
+#include "nsNetUtil.h"
+#include "nsIDocShellLoadInfo.h"
+#include "nsIWebNavigation.h"
+#include "prprf.h"
+#include "nsIMsgHdr.h"
+#include "nsIFileURL.h"
+#include "mozilla/RefPtr.h"
+
+nsMailboxService::nsMailboxService()
+{
+    mPrintingOperation = false;
+}
+
+nsMailboxService::~nsMailboxService()
+{}
+
+NS_IMPL_ISUPPORTS(nsMailboxService, nsIMailboxService, nsIMsgMessageService, nsIProtocolHandler, nsIMsgMessageFetchPartService)
+
+nsresult nsMailboxService::ParseMailbox(nsIMsgWindow *aMsgWindow, nsIFile *aMailboxPath, nsIStreamListener *aMailboxParser,
+                    nsIUrlListener * aUrlListener, nsIURI ** aURL)
+{
+  NS_ENSURE_ARG_POINTER(aMailboxPath);
+
+  nsresult rv;
+  nsCOMPtr<nsIMailboxUrl> mailboxurl =
+    do_CreateInstance(NS_MAILBOXURL_CONTRACTID, &rv);
+  if (NS_SUCCEEDED(rv) && mailboxurl)
+  {
+    nsCOMPtr<nsIMsgMailNewsUrl> url = do_QueryInterface(mailboxurl);
+    // okay now generate the url string
+    nsCString mailboxPath;
+
+    aMailboxPath->GetNativePath(mailboxPath);
+    nsAutoCString buf;
+    MsgEscapeURL(mailboxPath,
+                 nsINetUtil::ESCAPE_URL_MINIMAL | nsINetUtil::ESCAPE_URL_FORCED, buf);
+    nsEscapeNativePath(buf);
+    url->SetUpdatingFolder(true);
+    url->SetMsgWindow(aMsgWindow);
+    nsAutoCString uriSpec("mailbox://");
+    uriSpec.Append(buf);
+    rv = url->SetSpec(uriSpec);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    mailboxurl->SetMailboxParser(aMailboxParser);
+    if (aUrlListener)
+      url->RegisterListener(aUrlListener);
+
+    rv = RunMailboxUrl(url, nullptr);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    if (aURL)
+    {
+      *aURL = url;
+      NS_IF_ADDREF(*aURL);
+    }
+  }
+
+  return rv;
+}
+
+nsresult nsMailboxService::CopyMessage(const char * aSrcMailboxURI,
+                              nsIStreamListener * aMailboxCopyHandler,
+                              bool moveMessage,
+                              nsIUrlListener * aUrlListener,
+                              nsIMsgWindow *aMsgWindow,
+                              nsIURI **aURL)
+{
+    nsMailboxAction mailboxAction = nsIMailboxUrl::ActionMoveMessage;
+    if (!moveMessage)
+        mailboxAction = nsIMailboxUrl::ActionCopyMessage;
+  return FetchMessage(aSrcMailboxURI, aMailboxCopyHandler, aMsgWindow, aUrlListener, nullptr, mailboxAction, nullptr, aURL);
+}
+
+nsresult nsMailboxService::CopyMessages(uint32_t aNumKeys,
+                                        nsMsgKey* aMsgKeys,
+                                        nsIMsgFolder *srcFolder,
+                                        nsIStreamListener * aMailboxCopyHandler,
+                                        bool moveMessage,
+                                        nsIUrlListener * aUrlListener,
+                                        nsIMsgWindow *aMsgWindow,
+                                        nsIURI **aURL)
+{
+  nsresult rv = NS_OK;
+  NS_ENSURE_ARG(srcFolder);
+  NS_ENSURE_ARG(aMsgKeys);
+  nsCOMPtr<nsIMailboxUrl> mailboxurl;
+
+  nsMailboxAction actionToUse = nsIMailboxUrl::ActionMoveMessage;
+  if (!moveMessage)
+     actionToUse = nsIMailboxUrl::ActionCopyMessage;
+
+  nsCOMPtr <nsIMsgDBHdr> msgHdr;
+  nsCOMPtr <nsIMsgDatabase> db;
+  srcFolder->GetMsgDatabase(getter_AddRefs(db));
+  if (db)
+  {
+    db->GetMsgHdrForKey(aMsgKeys[0], getter_AddRefs(msgHdr));
+    if (msgHdr)
+    {
+      nsCString uri;
+      srcFolder->GetUriForMsg(msgHdr, uri);
+      rv = PrepareMessageUrl(uri.get(), aUrlListener, actionToUse , getter_AddRefs(mailboxurl), aMsgWindow);
+
+      if (NS_SUCCEEDED(rv))
+      {
+        nsCOMPtr<nsIURI> url = do_QueryInterface(mailboxurl);
+        nsCOMPtr<nsIMsgMailNewsUrl> msgUrl (do_QueryInterface(url));
+        nsCOMPtr<nsIMailboxUrl> mailboxUrl (do_QueryInterface(url));
+        msgUrl->SetMsgWindow(aMsgWindow);
+
+        mailboxUrl->SetMoveCopyMsgKeys(aMsgKeys, aNumKeys);
+        rv = RunMailboxUrl(url, aMailboxCopyHandler);
+      }
+    }
+  }
+  if (aURL && mailboxurl)
+    CallQueryInterface(mailboxurl, aURL);
+
+  return rv;
+}
+
+nsresult nsMailboxService::FetchMessage(const char* aMessageURI,
+                                        nsISupports * aDisplayConsumer,
+                                        nsIMsgWindow * aMsgWindow,
+                                        nsIUrlListener * aUrlListener,
+                                        const char * aFileName, /* only used by open attachment... */
+                                        nsMailboxAction mailboxAction,
+                                        const char * aCharsetOverride,
+                                        nsIURI ** aURL)
+{
+  nsresult rv = NS_OK;
+  nsCOMPtr<nsIMailboxUrl> mailboxurl;
+  nsMailboxAction actionToUse = mailboxAction;
+  nsCOMPtr<nsIURI> url;
+  nsCOMPtr<nsIMsgMailNewsUrl> msgUrl;
+  nsAutoCString uriString(aMessageURI);
+
+  if (!strncmp(aMessageURI, "file:", 5))
+  {
+    int64_t fileSize;
+    nsCOMPtr<nsIURI> fileUri;
+    rv = NS_NewURI(getter_AddRefs(fileUri), aMessageURI);
+    NS_ENSURE_SUCCESS(rv, rv);
+    nsCOMPtr <nsIFileURL> fileUrl = do_QueryInterface(fileUri, &rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+    nsCOMPtr <nsIFile> file;
+    rv = fileUrl->GetFile(getter_AddRefs(file));
+    NS_ENSURE_SUCCESS(rv, rv);
+    file->GetFileSize(&fileSize);
+    uriString.Replace(0, 5, NS_LITERAL_CSTRING("mailbox:"));
+    uriString.Append(NS_LITERAL_CSTRING("&number=0"));
+    rv = NS_NewURI(getter_AddRefs(url), uriString);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    msgUrl = do_QueryInterface(url);
+    if (msgUrl)
+    {
+      msgUrl->SetMsgWindow(aMsgWindow);
+      nsCOMPtr <nsIMailboxUrl> mailboxUrl = do_QueryInterface(msgUrl, &rv);
+      mailboxUrl->SetMessageSize((uint32_t) fileSize);
+      nsCOMPtr <nsIMsgHeaderSink> headerSink;
+       // need to tell the header sink to capture some headers to create a fake db header
+       // so we can do reply to a .eml file or a rfc822 msg attachment.
+      if (aMsgWindow)
+        aMsgWindow->GetMsgHeaderSink(getter_AddRefs(headerSink));
+      if (headerSink)
+      {
+        nsCOMPtr <nsIMsgDBHdr> dummyHeader;
+        headerSink->GetDummyMsgHeader(getter_AddRefs(dummyHeader));
+        if (dummyHeader)
+          dummyHeader->SetMessageSize((uint32_t) fileSize);
+      }
+    }
+  }
+  else
+  {
+    // this happens with forward inline of message/rfc822 attachment
+    // opened in a stand-alone msg window.
+    int32_t typeIndex = uriString.Find("&type=application/x-message-display");
+    if (typeIndex != -1)
+    {
+      uriString.Cut(typeIndex, sizeof("&type=application/x-message-display") - 1);
+      rv = NS_NewURI(getter_AddRefs(url), uriString.get());
+      mailboxurl = do_QueryInterface(url);
+    }
+    else
+      rv = PrepareMessageUrl(aMessageURI, aUrlListener, actionToUse , getter_AddRefs(mailboxurl), aMsgWindow);
+
+    if (NS_SUCCEEDED(rv))
+    {
+      url = do_QueryInterface(mailboxurl);
+      msgUrl = do_QueryInterface(url);
+      msgUrl->SetMsgWindow(aMsgWindow);
+      if (aFileName)
+        msgUrl->SetFileName(nsDependentCString(aFileName));
+    }
+  }
+
+  nsCOMPtr<nsIMsgI18NUrl> i18nurl(do_QueryInterface(msgUrl));
+  if (i18nurl)
+    i18nurl->SetCharsetOverRide(aCharsetOverride);
+
+  // instead of running the mailbox url like we used to, let's try to run the url in the docshell...
+  nsCOMPtr<nsIDocShell> docShell(do_QueryInterface(aDisplayConsumer, &rv));
+  // if we were given a docShell, run the url in the docshell..otherwise just run it normally.
+  if (NS_SUCCEEDED(rv) && docShell)
+  {
+    nsCOMPtr<nsIDocShellLoadInfo> loadInfo;
+    // DIRTY LITTLE HACK --> if we are opening an attachment we want the docshell to
+    // treat this load as if it were a user click event. Then the dispatching stuff will be much
+    // happier.
+    if (mailboxAction == nsIMailboxUrl::ActionFetchPart)
+    {
+      docShell->CreateLoadInfo(getter_AddRefs(loadInfo));
+      loadInfo->SetLoadType(nsIDocShellLoadInfo::loadLink);
+    }
+    rv = docShell->LoadURI(url, loadInfo, nsIWebNavigation::LOAD_FLAGS_NONE, false);
+  }
+  else
+    rv = RunMailboxUrl(url, aDisplayConsumer);
+
+  if (aURL && mailboxurl)
+    CallQueryInterface(mailboxurl, aURL);
+
+  return rv;
+}
+
+NS_IMETHODIMP nsMailboxService::FetchMimePart(nsIURI *aURI, const char *aMessageURI, nsISupports *aDisplayConsumer, nsIMsgWindow *aMsgWindow, nsIUrlListener *aUrlListener, nsIURI **aURL)
+{
+  nsresult rv;
+  nsCOMPtr<nsIMsgMailNewsUrl> msgUrl (do_QueryInterface(aURI, &rv));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  msgUrl->SetMsgWindow(aMsgWindow);
+
+  // set up the url listener
+  if (aUrlListener)
+    msgUrl->RegisterListener(aUrlListener);
+
+  return RunMailboxUrl(msgUrl, aDisplayConsumer);
+}
+
+NS_IMETHODIMP nsMailboxService::DisplayMessage(const char* aMessageURI,
+                                               nsISupports * aDisplayConsumer,
+                                               nsIMsgWindow * aMsgWindow,
+                                               nsIUrlListener * aUrlListener,
+                                               const char * aCharsetOveride,
+                                               nsIURI ** aURL)
+{
+  return FetchMessage(aMessageURI, aDisplayConsumer,
+    aMsgWindow,aUrlListener, nullptr,
+    nsIMailboxUrl::ActionFetchMessage, aCharsetOveride, aURL);
+}
+
+NS_IMETHODIMP
+nsMailboxService::StreamMessage(const char *aMessageURI,
+                                nsISupports *aConsumer,
+                                nsIMsgWindow *aMsgWindow,
+                                nsIUrlListener *aUrlListener,
+                                bool /* aConvertData */,
+                                const nsACString &aAdditionalHeader,
+                                bool aLocalOnly,
+                                nsIURI **aURL)
+{
+    // The mailbox protocol object will look for "header=filter" or
+    // "header=attach" to decide if it wants to convert the data instead of
+    // using aConvertData. It turns out to be way too hard to pass aConvertData
+    // all the way over to the mailbox protocol object.
+    nsAutoCString aURIString(aMessageURI);
+    if (!aAdditionalHeader.IsEmpty())
+    {
+      aURIString.FindChar('?') == -1 ? aURIString += "?" : aURIString += "&";
+      aURIString += "header=";
+      aURIString += aAdditionalHeader;
+    }
+
+    return FetchMessage(aURIString.get(), aConsumer, aMsgWindow, aUrlListener, nullptr,
+                                        nsIMailboxUrl::ActionFetchMessage, nullptr, aURL);
+}
+
+NS_IMETHODIMP nsMailboxService::StreamHeaders(const char *aMessageURI,
+                                              nsIStreamListener *aConsumer,
+                                              nsIUrlListener *aUrlListener,
+                                              bool aLocalOnly,
+                                              nsIURI **aURL)
+{
+  NS_ENSURE_ARG_POINTER(aMessageURI);
+  NS_ENSURE_ARG_POINTER(aConsumer);
+  nsAutoCString folderURI;
+  nsMsgKey msgKey;
+  nsCOMPtr<nsIMsgFolder> folder;
+  nsresult rv = DecomposeMailboxURI(aMessageURI, getter_AddRefs(folder), &msgKey);
+  if (msgKey == nsMsgKey_None)
+    return NS_MSG_MESSAGE_NOT_FOUND;
+
+  nsCOMPtr<nsIInputStream> inputStream;
+  int64_t messageOffset;
+  uint32_t messageSize;
+  rv = folder->GetOfflineFileStream(msgKey, &messageOffset, &messageSize, getter_AddRefs(inputStream));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // GetOfflineFileStream returns NS_OK but null inputStream when there is an error getting the database
+  if (!inputStream)
+    return NS_ERROR_FAILURE;
+  return MsgStreamMsgHeaders(inputStream, aConsumer);
+}
+
+
+NS_IMETHODIMP nsMailboxService::IsMsgInMemCache(nsIURI *aUrl,
+                                                nsIMsgFolder *aFolder,
+                                                bool *aResult)
+{
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP nsMailboxService::OpenAttachment(const char *aContentType,
+                                               const char *aFileName,
+                                               const char *aUrl,
+                                               const char *aMessageUri,
+                                               nsISupports *aDisplayConsumer,
+                                               nsIMsgWindow *aMsgWindow,
+                                               nsIUrlListener *aUrlListener)
+{
+  nsCOMPtr <nsIURI> URL;
+  nsAutoCString urlString(aUrl);
+  urlString += "&type=";
+  urlString += aContentType;
+  urlString += "&filename=";
+  urlString += aFileName;
+  CreateStartupUrl(urlString.get(), getter_AddRefs(URL));
+  nsresult rv;
+
+  // try to run the url in the docshell...
+  nsCOMPtr<nsIDocShell> docShell(do_QueryInterface(aDisplayConsumer, &rv));
+  // if we were given a docShell, run the url in the docshell..otherwise just run it normally.
+  if (NS_SUCCEEDED(rv) && docShell)
+  {
+    nsCOMPtr<nsIDocShellLoadInfo> loadInfo;
+    // DIRTY LITTLE HACK --> since we are opening an attachment we want the docshell to
+    // treat this load as if it were a user click event. Then the dispatching stuff will be much
+    // happier.
+    docShell->CreateLoadInfo(getter_AddRefs(loadInfo));
+    loadInfo->SetLoadType(nsIDocShellLoadInfo::loadLink);
+    return docShell->LoadURI(URL, loadInfo, nsIWebNavigation::LOAD_FLAGS_NONE, false);
+  }
+  return RunMailboxUrl(URL, aDisplayConsumer);
+
+}
+
+
+NS_IMETHODIMP
+nsMailboxService::SaveMessageToDisk(const char *aMessageURI,
+                                    nsIFile *aFile,
+                                    bool aAddDummyEnvelope,
+                                    nsIUrlListener *aUrlListener,
+                                    nsIURI **aURL,
+                                    bool canonicalLineEnding,
+                                    nsIMsgWindow *aMsgWindow)
+{
+  nsresult rv = NS_OK;
+  nsCOMPtr<nsIMailboxUrl> mailboxurl;
+
+  rv = PrepareMessageUrl(aMessageURI, aUrlListener, nsIMailboxUrl::ActionSaveMessageToDisk, getter_AddRefs(mailboxurl), aMsgWindow);
+
+  if (NS_SUCCEEDED(rv))
+  {
+    nsCOMPtr<nsIMsgMessageUrl> msgUrl = do_QueryInterface(mailboxurl);
+    if (msgUrl)
+    {
+      msgUrl->SetMessageFile(aFile);
+      msgUrl->SetAddDummyEnvelope(aAddDummyEnvelope);
+      msgUrl->SetCanonicalLineEnding(canonicalLineEnding);
+    }
+
+    nsCOMPtr<nsIURI> url = do_QueryInterface(mailboxurl);
+    rv = RunMailboxUrl(url);
+  }
+
+  if (aURL && mailboxurl)
+    CallQueryInterface(mailboxurl, aURL);
+
+  return rv;
+}
+
+NS_IMETHODIMP nsMailboxService::GetUrlForUri(const char *aMessageURI, nsIURI **aURL, nsIMsgWindow *aMsgWindow)
+{
+  NS_ENSURE_ARG_POINTER(aURL);
+  if (!strncmp(aMessageURI, "file:", 5) || PL_strstr(aMessageURI, "type=application/x-message-display")
+    || !strncmp(aMessageURI, "mailbox:", 8))
+    return NS_NewURI(aURL, aMessageURI);
+
+  nsresult rv = NS_OK;
+  nsCOMPtr<nsIMailboxUrl> mailboxurl;
+  rv = PrepareMessageUrl(aMessageURI, nullptr, nsIMailboxUrl::ActionFetchMessage, getter_AddRefs(mailboxurl), aMsgWindow);
+  if (NS_SUCCEEDED(rv) && mailboxurl)
+    rv = CallQueryInterface(mailboxurl, aURL);
+  return rv;
+}
+
+// Takes a mailbox url, this method creates a protocol instance and loads the url
+// into the protocol instance.
+nsresult nsMailboxService::RunMailboxUrl(nsIURI * aMailboxUrl, nsISupports * aDisplayConsumer)
+{
+  // create a protocol instance to run the url..
+  nsresult rv = NS_OK;
+  nsMailboxProtocol * protocol = new nsMailboxProtocol(aMailboxUrl);
+
+  if (protocol)
+  {
+    rv = protocol->Initialize(aMailboxUrl);
+    if (NS_FAILED(rv))
+    {
+      delete protocol;
+      return rv;
+    }
+    NS_ADDREF(protocol);
+    rv = protocol->LoadUrl(aMailboxUrl, aDisplayConsumer);
+    NS_RELEASE(protocol); // after loading, someone else will have a ref cnt on the mailbox
+  }
+
+  return rv;
+}
+
+// This function takes a message uri, converts it into a file path & msgKey
+// pair. It then turns that into a mailbox url object. It also registers a url
+// listener if appropriate. AND it can take in a mailbox action and set that field
+// on the returned url as well.
+nsresult nsMailboxService::PrepareMessageUrl(const char * aSrcMsgMailboxURI, nsIUrlListener * aUrlListener,
+                                             nsMailboxAction aMailboxAction, nsIMailboxUrl ** aMailboxUrl,
+                                             nsIMsgWindow *msgWindow)
+{
+  nsresult rv = CallCreateInstance(NS_MAILBOXURL_CONTRACTID, aMailboxUrl);
+  if (NS_SUCCEEDED(rv) && aMailboxUrl && *aMailboxUrl)
+  {
+    // okay now generate the url string
+    char * urlSpec;
+    nsAutoCString folderURI;
+    nsMsgKey msgKey;
+    nsCString folderPath;
+    const char *part = PL_strstr(aSrcMsgMailboxURI, "part=");
+    const char *header = PL_strstr(aSrcMsgMailboxURI, "header=");
+    rv = nsParseLocalMessageURI(aSrcMsgMailboxURI, folderURI, &msgKey);
+    NS_ENSURE_SUCCESS(rv,rv);
+    rv = nsLocalURI2Path(kMailboxRootURI, folderURI.get(), folderPath);
+
+    if (NS_SUCCEEDED(rv))
+    {
+      // set up the url spec and initialize the url with it.
+      nsAutoCString buf;
+      MsgEscapeURL(folderPath,
+                   nsINetUtil::ESCAPE_URL_DIRECTORY | nsINetUtil::ESCAPE_URL_FORCED, buf);
+      if (mPrintingOperation)
+        urlSpec = PR_smprintf("mailbox://%s?number=%lu&header=print", buf.get(), msgKey);
+      else if (part)
+        urlSpec = PR_smprintf("mailbox://%s?number=%lu&%s", buf.get(), msgKey, part);
+      else if (header)
+        urlSpec = PR_smprintf("mailbox://%s?number=%lu&%s", buf.get(), msgKey, header);
+      else
+        urlSpec = PR_smprintf("mailbox://%s?number=%lu", buf.get(), msgKey);
+
+      nsCOMPtr <nsIMsgMailNewsUrl> url = do_QueryInterface(*aMailboxUrl);
+      rv = url->SetSpec(nsDependentCString(urlSpec));
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      PR_smprintf_free(urlSpec);
+
+      (*aMailboxUrl)->SetMailboxAction(aMailboxAction);
+
+      // set up the url listener
+      if (aUrlListener)
+        rv = url->RegisterListener(aUrlListener);
+
+      url->SetMsgWindow(msgWindow);
+      nsCOMPtr<nsIMsgMessageUrl> msgUrl = do_QueryInterface(url);
+      if (msgUrl)
+      {
+        msgUrl->SetOriginalSpec(aSrcMsgMailboxURI);
+        msgUrl->SetUri(aSrcMsgMailboxURI);
+      }
+
+    } // if we got a url
+  } // if we got a url
+
+  return rv;
+}
+
+NS_IMETHODIMP nsMailboxService::GetScheme(nsACString &aScheme)
+{
+  aScheme = "mailbox";
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsMailboxService::GetDefaultPort(int32_t *aDefaultPort)
+{
+  NS_ENSURE_ARG_POINTER(aDefaultPort);
+  *aDefaultPort = -1;  // mailbox doesn't use a port!!!!!
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsMailboxService::AllowPort(int32_t port, const char *scheme, bool *_retval)
+{
+  NS_ENSURE_ARG_POINTER(_retval);
+  // don't override anything.
+  *_retval = false;
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsMailboxService::GetProtocolFlags(uint32_t *result)
+{
+  NS_ENSURE_ARG_POINTER(result);
+  *result = URI_STD | URI_FORBIDS_AUTOMATIC_DOCUMENT_REPLACEMENT |
+            URI_DANGEROUS_TO_LOAD | URI_FORBIDS_COOKIE_ACCESS
+#ifdef IS_ORIGIN_IS_FULL_SPEC_DEFINED
+            | ORIGIN_IS_FULL_SPEC
+#endif
+  ;
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsMailboxService::NewURI(const nsACString &aSpec,
+                                       const char *aOriginCharset,
+                                       nsIURI *aBaseURI,
+                                       nsIURI **_retval)
+{
+  NS_ENSURE_ARG_POINTER(_retval);
+  *_retval = 0;
+  nsresult rv;
+  nsCOMPtr<nsIURI> aMsgUri = do_CreateInstance(NS_MAILBOXURL_CONTRACTID, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+  // SetSpec calls below may fail if the mailbox url is of the form
+  // mailbox://<account>/<mailbox name>?... instead of
+  // mailbox://<path to folder>?.... This is the case for pop3 download urls.
+  // We know this, and the failure is harmless.
+  if (aBaseURI)
+  {
+    nsAutoCString newSpec;
+    rv = aBaseURI->Resolve(aSpec, newSpec);
+    NS_ENSURE_SUCCESS(rv, rv);
+    (void) aMsgUri->SetSpec(newSpec);
+  }
+  else
+  {
+    (void) aMsgUri->SetSpec(aSpec);
+  }
+  aMsgUri.swap(*_retval);
+
+  return rv;
+}
+
+NS_IMETHODIMP nsMailboxService::NewChannel(nsIURI *aURI, nsIChannel **_retval)
+{
+  return NewChannel2(aURI, nullptr, _retval);
+}
+
+NS_IMETHODIMP nsMailboxService::NewChannel2(nsIURI *aURI,
+                                            nsILoadInfo *aLoadInfo,
+                                            nsIChannel **_retval)
+{
+  NS_ENSURE_ARG_POINTER(aURI);
+  NS_ENSURE_ARG_POINTER(_retval);
+  nsresult rv = NS_OK;
+  nsAutoCString spec;
+  rv = aURI->GetSpec(spec);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  if (spec.Find("?uidl=") >= 0 || spec.Find("&uidl=") >= 0)
+  {
+    nsCOMPtr<nsIProtocolHandler> handler =
+             do_GetService(NS_POP3SERVICE_CONTRACTID1, &rv);
+    if (NS_SUCCEEDED(rv))
+    {
+      nsCOMPtr <nsIURI> pop3Uri;
+
+      rv = handler->NewURI(spec, "" /* ignored */, aURI, getter_AddRefs(pop3Uri));
+      NS_ENSURE_SUCCESS(rv, rv);
+      return handler->NewChannel2(pop3Uri, aLoadInfo, _retval);
+    }
+  }
+
+  RefPtr<nsMailboxProtocol> protocol = new nsMailboxProtocol(aURI);
+  if (!protocol) {
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+
+  rv = protocol->Initialize(aURI);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = protocol->SetLoadInfo(aLoadInfo);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  return CallQueryInterface(protocol, _retval);
+}
+
+nsresult nsMailboxService::DisplayMessageForPrinting(const char* aMessageURI,
+                                                     nsISupports * aDisplayConsumer,
+                                                     nsIMsgWindow * aMsgWindow,
+                                                     nsIUrlListener * aUrlListener,
+                                                     nsIURI ** aURL)
+{
+  mPrintingOperation = true;
+  nsresult rv = FetchMessage(aMessageURI, aDisplayConsumer, aMsgWindow,aUrlListener, nullptr,
+    nsIMailboxUrl::ActionFetchMessage, nullptr, aURL);
+  mPrintingOperation = false;
+  return rv;
+}
+
+NS_IMETHODIMP nsMailboxService::Search(nsIMsgSearchSession *aSearchSession, nsIMsgWindow *aMsgWindow, nsIMsgFolder *aMsgFolder, const char *aMessageUri)
+{
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+nsresult
+nsMailboxService::DecomposeMailboxURI(const char * aMessageURI, nsIMsgFolder ** aFolder, nsMsgKey *aMsgKey)
+{
+  NS_ENSURE_ARG_POINTER(aMessageURI);
+  NS_ENSURE_ARG_POINTER(aFolder);
+  NS_ENSURE_ARG_POINTER(aMsgKey);
+
+  nsresult rv = NS_OK;
+  nsAutoCString folderURI;
+  rv = nsParseLocalMessageURI(aMessageURI, folderURI, aMsgKey);
+  NS_ENSURE_SUCCESS(rv,rv);
+
+  nsCOMPtr <nsIRDFService> rdf = do_GetService("@mozilla.org/rdf/rdf-service;1",&rv);
+  NS_ENSURE_SUCCESS(rv,rv);
+
+  nsCOMPtr<nsIRDFResource> res;
+  rv = rdf->GetResource(folderURI, getter_AddRefs(res));
+  NS_ENSURE_SUCCESS(rv,rv);
+
+  rv = res->QueryInterface(NS_GET_IID(nsIMsgFolder), (void **) aFolder);
+  NS_ENSURE_SUCCESS(rv,rv);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsMailboxService::MessageURIToMsgHdr(const char *uri, nsIMsgDBHdr **_retval)
+{
+  NS_ENSURE_ARG_POINTER(uri);
+  NS_ENSURE_ARG_POINTER(_retval);
+
+  nsresult rv = NS_OK;
+
+  nsCOMPtr<nsIMsgFolder> folder;
+  nsMsgKey msgKey;
+
+  rv = DecomposeMailboxURI(uri, getter_AddRefs(folder), &msgKey);
+  NS_ENSURE_SUCCESS(rv,rv);
+
+  rv = folder->GetMessageHeader(msgKey, _retval);
+  NS_ENSURE_SUCCESS(rv,rv);
+  return NS_OK;
+}
diff --git a/mailnews/local/src/nsMailboxService.h b/mailnews/local/src/nsMailboxService.h
new file mode 100644
index 000000000..c7fc759ee
--- /dev/null
+++ b/mailnews/local/src/nsMailboxService.h
@@ -0,0 +1,57 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsMailboxService_h___
+#define nsMailboxService_h___
+
+#include "nscore.h"
+#include "nsISupports.h"
+
+#include "nsIMailboxService.h"
+#include "nsIMsgMessageService.h"
+#include "nsIMailboxUrl.h"
+#include "nsIURL.h"
+#include "nsIUrlListener.h"
+#include "nsIStreamListener.h"
+#include "nsIFile.h"
+#include "nsIProtocolHandler.h"
+#include "nsIRDFService.h"
+
+class nsMailboxService : public nsIMailboxService, public nsIMsgMessageService, public nsIMsgMessageFetchPartService, public nsIProtocolHandler
+{
+public:
+
+  nsMailboxService();
+
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIMAILBOXSERVICE
+  NS_DECL_NSIMSGMESSAGESERVICE
+  NS_DECL_NSIMSGMESSAGEFETCHPARTSERVICE
+  NS_DECL_NSIPROTOCOLHANDLER
+
+protected:
+  virtual ~nsMailboxService();
+  bool          mPrintingOperation;
+
+  // helper functions used by the service
+  nsresult PrepareMessageUrl(const char * aSrcMsgMailboxURI, nsIUrlListener * aUrlListener,
+                 nsMailboxAction aMailboxAction, nsIMailboxUrl ** aMailboxUrl,
+                 nsIMsgWindow *msgWindow);
+
+  nsresult RunMailboxUrl(nsIURI * aMailboxUrl, nsISupports * aDisplayConsumer = nullptr);
+
+  nsresult FetchMessage(const char* aMessageURI,
+                        nsISupports * aDisplayConsumer,
+                        nsIMsgWindow * aMsgWindow,
+                        nsIUrlListener * aUrlListener,
+                        const char * aFileName, /* only used by open attachment */
+                        nsMailboxAction mailboxAction,
+                        const char * aCharsetOverride,
+                        nsIURI ** aURL);
+
+  nsresult DecomposeMailboxURI(const char * aMessageURI, nsIMsgFolder ** aFolder, nsMsgKey *aMsgKey);
+};
+
+#endif /* nsMailboxService_h___ */
diff --git a/mailnews/local/src/nsMailboxUrl.cpp b/mailnews/local/src/nsMailboxUrl.cpp
new file mode 100644
index 000000000..25fe4f35f
--- /dev/null
+++ b/mailnews/local/src/nsMailboxUrl.cpp
@@ -0,0 +1,556 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "msgCore.h"    // precompiled header...
+
+#include "nsIURI.h"
+#include "nsIMailboxUrl.h"
+#include "nsMailboxUrl.h"
+
+#include "nsStringGlue.h"
+#include "nsLocalUtils.h"
+#include "nsIMsgDatabase.h"
+#include "nsMsgDBCID.h"
+#include "nsMsgBaseCID.h"
+#include "nsIMsgHdr.h"
+
+#include "nsIMsgFolder.h"
+#include "prprf.h"
+#include "prmem.h"
+#include "nsIMsgMailSession.h"
+#include "nsNetUtil.h"
+#include "nsIFileURL.h"
+
+// this is totally lame and MUST be removed by M6
+// the real fix is to attach the URI to the URL as it runs through netlib
+// then grab it and use it on the other side
+#include "nsCOMPtr.h"
+#include "nsMsgBaseCID.h"
+#include "nsIMsgAccountManager.h"
+#include "nsMsgUtils.h"
+#include "mozilla/Services.h"
+
+// helper function for parsing the search field of a url
+char * extractAttributeValue(const char * searchString, const char * attributeName);
+
+nsMailboxUrl::nsMailboxUrl()
+{
+  m_mailboxAction = nsIMailboxUrl::ActionParseMailbox;
+  m_filePath = nullptr;
+  m_messageID = nullptr;
+  m_messageKey = nsMsgKey_None;
+  m_messageSize = 0;
+  m_messageFile = nullptr;
+  m_addDummyEnvelope = false;
+  m_canonicalLineEnding = false;
+  m_curMsgIndex = 0;
+}
+
+nsMailboxUrl::~nsMailboxUrl()
+{
+    PR_Free(m_messageID);
+}
+
+NS_IMPL_ADDREF_INHERITED(nsMailboxUrl, nsMsgMailNewsUrl)
+NS_IMPL_RELEASE_INHERITED(nsMailboxUrl, nsMsgMailNewsUrl)
+
+NS_INTERFACE_MAP_BEGIN(nsMailboxUrl)
+   NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIMailboxUrl)
+   NS_INTERFACE_MAP_ENTRY(nsIMailboxUrl)
+   NS_INTERFACE_MAP_ENTRY(nsIMsgMessageUrl)
+   NS_INTERFACE_MAP_ENTRY(nsIMsgI18NUrl)
+NS_INTERFACE_MAP_END_INHERITING(nsMsgMailNewsUrl)
+
+////////////////////////////////////////////////////////////////////////////////////
+// Begin nsIMailboxUrl specific support
+////////////////////////////////////////////////////////////////////////////////////
+nsresult nsMailboxUrl::SetMailboxParser(nsIStreamListener * aMailboxParser)
+{
+  if (aMailboxParser)
+    m_mailboxParser = aMailboxParser;
+  return NS_OK;
+}
+
+nsresult nsMailboxUrl::GetMailboxParser(nsIStreamListener ** aConsumer)
+{
+  NS_ENSURE_ARG_POINTER(aConsumer);
+
+  NS_IF_ADDREF(*aConsumer = m_mailboxParser);
+  return  NS_OK;
+}
+
+nsresult nsMailboxUrl::SetMailboxCopyHandler(nsIStreamListener * aMailboxCopyHandler)
+{
+  if (aMailboxCopyHandler)
+    m_mailboxCopyHandler = aMailboxCopyHandler;
+  return NS_OK;
+}
+
+nsresult nsMailboxUrl::GetMailboxCopyHandler(nsIStreamListener ** aMailboxCopyHandler)
+{
+  NS_ENSURE_ARG_POINTER(aMailboxCopyHandler);
+
+  if (aMailboxCopyHandler)
+  {
+    *aMailboxCopyHandler = m_mailboxCopyHandler;
+    NS_IF_ADDREF(*aMailboxCopyHandler);
+  }
+
+  return  NS_OK;
+}
+
+nsresult nsMailboxUrl::GetMessageKey(nsMsgKey* aMessageKey)
+{
+  *aMessageKey = m_messageKey;
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsMailboxUrl::GetMessageSize(uint32_t * aMessageSize)
+{
+  if (aMessageSize)
+  {
+    *aMessageSize = m_messageSize;
+    return NS_OK;
+  }
+  else
+    return NS_ERROR_NULL_POINTER;
+}
+
+nsresult nsMailboxUrl::SetMessageSize(uint32_t aMessageSize)
+{
+  m_messageSize = aMessageSize;
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsMailboxUrl::GetPrincipalSpec(nsACString& aPrincipalSpec)
+{
+  nsCOMPtr<nsIMsgMailNewsUrl> mailnewsURL;
+  QueryInterface(NS_GET_IID(nsIMsgMailNewsUrl), getter_AddRefs(mailnewsURL));
+
+  nsAutoCString spec;
+  mailnewsURL->GetSpecIgnoringRef(spec);
+
+  // mailbox: URLs contain a lot of query parts. We want need a normalised form:
+  // mailbox:///path/to/folder?number=nn.
+  // We also need to translate the second form mailbox://user@domain@server/folder?number=nn.
+
+  char* messageKey = extractAttributeValue(spec.get(), "number=");
+
+  // Strip any query part beginning with ? or /;
+  int32_t ind = spec.Find("/;");
+  if (ind != kNotFound)
+    spec.SetLength(ind);
+
+  ind = spec.FindChar('?');
+  if (ind != kNotFound)
+    spec.SetLength(ind);
+
+  // Check for format lacking absolute path.
+  if (spec.Find("///") == kNotFound) {
+    nsCString folderPath;
+    nsresult rv = nsLocalURI2Path(kMailboxRootURI, spec.get(), folderPath);
+    if (NS_SUCCEEDED (rv)) {
+      nsAutoCString buf;
+      MsgEscapeURL(folderPath,
+                   nsINetUtil::ESCAPE_URL_DIRECTORY | nsINetUtil::ESCAPE_URL_FORCED, buf);
+      spec = NS_LITERAL_CSTRING("mailbox://") + buf;
+    }
+  }
+
+  spec += NS_LITERAL_CSTRING("?number=");
+  spec.Append(messageKey);
+  PR_Free(messageKey);
+
+  aPrincipalSpec.Assign(spec);
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsMailboxUrl::SetUri(const char * aURI)
+{
+  mURI= aURI;
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsMailboxUrl::CloneInternal(uint32_t aRefHandlingMode,
+                                          const nsACString& newRef,
+                                          nsIURI **_retval)
+{
+  nsresult rv = nsMsgMailNewsUrl::CloneInternal(aRefHandlingMode,
+                                                newRef, _retval);
+  NS_ENSURE_SUCCESS(rv, rv);
+  // also clone the mURI member, because GetUri below won't work if
+  // mURI isn't set due to nsIFile fun.
+  nsCOMPtr <nsIMsgMessageUrl> clonedUrl = do_QueryInterface(*_retval);
+  if (clonedUrl)
+    clonedUrl->SetUri(mURI.get());
+  return rv;
+}
+
+NS_IMETHODIMP nsMailboxUrl::GetUri(char ** aURI)
+{
+  // if we have been given a uri to associate with this url, then use it
+  // otherwise try to reconstruct a URI on the fly....
+
+  if (!mURI.IsEmpty())
+    *aURI = ToNewCString(mURI);
+  else
+  {
+    if (m_filePath)
+    {
+      nsAutoCString baseUri;
+      nsresult rv;
+      nsCOMPtr<nsIMsgAccountManager> accountManager =
+        do_GetService(NS_MSGACCOUNTMANAGER_CONTRACTID, &rv);
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      // we blow off errors here so that we can open attachments
+      // in .eml files.
+      (void) accountManager->FolderUriForPath(m_filePath, baseUri);
+      if (baseUri.IsEmpty()) {
+        rv = m_baseURL->GetSpec(baseUri);
+        NS_ENSURE_SUCCESS(rv, rv);
+      }
+      nsCString baseMessageURI;
+      nsCreateLocalBaseMessageURI(baseUri, baseMessageURI);
+      nsAutoCString uriStr;
+      nsBuildLocalMessageURI(baseMessageURI.get(), m_messageKey, uriStr);
+      *aURI = ToNewCString(uriStr);
+    }
+    else
+      *aURI = nullptr;
+  }
+
+  return NS_OK;
+}
+
+nsresult nsMailboxUrl::GetMsgHdrForKey(nsMsgKey  msgKey, nsIMsgDBHdr ** aMsgHdr)
+{
+  nsresult rv = NS_OK;
+  if (aMsgHdr && m_filePath)
+  {
+    nsCOMPtr<nsIMsgDatabase> mailDBFactory;
+    nsCOMPtr<nsIMsgDatabase> mailDB;
+    nsCOMPtr<nsIMsgDBService> msgDBService = do_GetService(NS_MSGDB_SERVICE_CONTRACTID, &rv);
+
+    if (msgDBService)
+      rv = msgDBService->OpenMailDBFromFile(m_filePath, nullptr, false,
+                                            false, getter_AddRefs(mailDB));
+    if (NS_SUCCEEDED(rv) && mailDB) // did we get a db back?
+      rv = mailDB->GetMsgHdrForKey(msgKey, aMsgHdr);
+    else
+    {
+      nsCOMPtr<nsIMsgWindow> msgWindow(do_QueryReferent(m_msgWindowWeak));
+      if (!msgWindow)
+      {
+        nsCOMPtr<nsIMsgMailSession> mailSession = do_GetService(NS_MSGMAILSESSION_CONTRACTID, &rv);
+        NS_ENSURE_SUCCESS(rv, rv);
+        mailSession->GetTopmostMsgWindow(getter_AddRefs(msgWindow));
+      }
+
+      // maybe this is .eml file we're trying to read. See if we can get a header from the header sink.
+      if (msgWindow)
+      {
+        nsCOMPtr<nsIMsgHeaderSink> headerSink;
+        msgWindow->GetMsgHeaderSink(getter_AddRefs(headerSink));
+        if (headerSink)
+        {
+          rv = headerSink->GetDummyMsgHeader(aMsgHdr);
+          if (NS_SUCCEEDED(rv))
+          {
+            int64_t fileSize = 0;
+            m_filePath->GetFileSize(&fileSize);
+            (*aMsgHdr)->SetMessageSize(fileSize);
+          }
+        }
+      }
+    }
+  }
+  else
+    rv = NS_ERROR_NULL_POINTER;
+
+  return rv;
+}
+
+NS_IMETHODIMP nsMailboxUrl::GetMessageHeader(nsIMsgDBHdr ** aMsgHdr)
+{
+  if (m_dummyHdr)
+  {
+    NS_IF_ADDREF(*aMsgHdr = m_dummyHdr);
+    return NS_OK;
+  }
+  return GetMsgHdrForKey(m_messageKey, aMsgHdr);
+}
+
+NS_IMETHODIMP nsMailboxUrl::SetMessageHeader(nsIMsgDBHdr *aMsgHdr)
+{
+  m_dummyHdr = aMsgHdr;
+  return NS_OK;
+}
+
+NS_IMPL_GETSET(nsMailboxUrl, AddDummyEnvelope, bool, m_addDummyEnvelope)
+NS_IMPL_GETSET(nsMailboxUrl, CanonicalLineEnding, bool, m_canonicalLineEnding)
+
+NS_IMETHODIMP
+nsMailboxUrl::GetOriginalSpec(char **aSpec)
+{
+  if (!aSpec || m_originalSpec.IsEmpty())
+    return NS_ERROR_NULL_POINTER;
+  *aSpec = ToNewCString(m_originalSpec);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsMailboxUrl::SetOriginalSpec(const char *aSpec)
+{
+  m_originalSpec = aSpec;
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsMailboxUrl::SetMessageFile(nsIFile * aFile)
+{
+  m_messageFile = aFile;
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsMailboxUrl::GetMessageFile(nsIFile ** aFile)
+{
+  // why don't we return an error for null aFile?
+  if (aFile)
+    NS_IF_ADDREF(*aFile = m_messageFile);
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsMailboxUrl::IsUrlType(uint32_t type, bool *isType)
+{
+  NS_ENSURE_ARG(isType);
+
+  switch(type)
+  {
+    case nsIMsgMailNewsUrl::eCopy:
+      *isType = (m_mailboxAction == nsIMailboxUrl::ActionCopyMessage);
+      break;
+    case nsIMsgMailNewsUrl::eMove:
+      *isType = (m_mailboxAction == nsIMailboxUrl::ActionMoveMessage);
+      break;
+    case nsIMsgMailNewsUrl::eDisplay:
+      *isType = (m_mailboxAction == nsIMailboxUrl::ActionFetchMessage ||
+                 m_mailboxAction == nsIMailboxUrl::ActionFetchPart);
+      break;
+    default:
+      *isType = false;
+  };
+
+  return NS_OK;
+
+}
+
+////////////////////////////////////////////////////////////////////////////////////
+// End nsIMailboxUrl specific support
+////////////////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////////////
+// possible search part phrases include: MessageID=id&number=MessageKey
+
+nsresult nsMailboxUrl::ParseSearchPart()
+{
+  nsAutoCString searchPart;
+  nsresult rv = GetQuery(searchPart);
+  // add code to this function to decompose everything past the '?'.....
+  if (NS_SUCCEEDED(rv) && !searchPart.IsEmpty())
+  {
+    // the action for this mailbox must be a display message...
+    char * msgPart = extractAttributeValue(searchPart.get(), "part=");
+    if (msgPart)  // if we have a part in the url then we must be fetching just the part.
+      m_mailboxAction = nsIMailboxUrl::ActionFetchPart;
+    else
+      m_mailboxAction = nsIMailboxUrl::ActionFetchMessage;
+
+    char * messageKey = extractAttributeValue(searchPart.get(), "number=");
+    m_messageID = extractAttributeValue(searchPart.get(),"messageid=");
+    if (messageKey)
+      m_messageKey = (nsMsgKey) ParseUint64Str(messageKey); // convert to a uint32_t...
+
+    PR_Free(msgPart);
+    PR_Free(messageKey);
+  }
+  else
+    m_mailboxAction = nsIMailboxUrl::ActionParseMailbox;
+
+  return rv;
+}
+
+// warning: don't assume when parsing the url that the protocol part is "news"...
+nsresult nsMailboxUrl::ParseUrl()
+{
+  GetFilePath(m_file);
+
+  ParseSearchPart();
+  // ### fix me.
+  // this hack is to avoid asserting on every local message loaded because the security manager
+  // is creating an empty "mailbox://" uri for every message.
+  if (m_file.Length() < 2)
+    m_filePath = nullptr;
+  else
+  {
+    nsCString fileUri("file://");
+    fileUri.Append(m_file);
+    nsresult rv;
+    nsCOMPtr<nsIIOService> ioService =
+      mozilla::services::GetIOService();
+    NS_ENSURE_TRUE(ioService, NS_ERROR_UNEXPECTED);
+    nsCOMPtr <nsIURI> uri;
+    rv = ioService->NewURI(fileUri, nullptr, nullptr, getter_AddRefs(uri));
+    NS_ENSURE_SUCCESS(rv, rv);
+    nsCOMPtr <nsIFileURL> fileURL = do_QueryInterface(uri);
+    NS_ENSURE_SUCCESS(rv, rv);
+    nsCOMPtr <nsIFile> fileURLFile;
+    fileURL->GetFile(getter_AddRefs(fileURLFile));
+    m_filePath = do_QueryInterface(fileURLFile, &rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  GetPath(m_file);
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsMailboxUrl::SetSpec(const nsACString &aSpec)
+{
+  nsresult rv = nsMsgMailNewsUrl::SetSpec(aSpec);
+  if (NS_SUCCEEDED(rv))
+    rv = ParseUrl();
+  return rv;
+}
+
+NS_IMETHODIMP nsMailboxUrl::SetQuery(const nsACString &aQuery)
+{
+  nsresult rv = nsMsgMailNewsUrl::SetQuery(aQuery);
+  if (NS_SUCCEEDED(rv))
+    rv = ParseUrl();
+  return rv;
+}
+
+// takes a string like ?messageID=fooo&number=MsgKey and returns a new string
+// containing just the attribute value. i.e you could pass in this string with
+// an attribute name of messageID and I'll return fooo. Use PR_Free to delete
+// this string...
+
+// Assumption: attribute pairs in the string are separated by '&'.
+char * extractAttributeValue(const char * searchString, const char * attributeName)
+{
+  char * attributeValue = nullptr;
+
+  if (searchString && attributeName)
+  {
+    // search the string for attributeName
+    uint32_t attributeNameSize = PL_strlen(attributeName);
+    char * startOfAttribute = PL_strcasestr(searchString, attributeName);
+    if (startOfAttribute)
+    {
+      startOfAttribute += attributeNameSize; // skip over the attributeName
+      if (startOfAttribute) // is there something after the attribute name
+      {
+        char * endOfAttribute = startOfAttribute ? PL_strchr(startOfAttribute, '&') : nullptr;
+        nsDependentCString attributeValueStr;
+        if (startOfAttribute && endOfAttribute) // is there text after attribute value
+          attributeValueStr.Assign(startOfAttribute, endOfAttribute - startOfAttribute);
+        else // there is nothing left so eat up rest of line.
+          attributeValueStr.Assign(startOfAttribute);
+
+        // now unescape the string...
+        nsCString unescapedValue;
+        MsgUnescapeString(attributeValueStr, 0, unescapedValue);
+        attributeValue = PL_strdup(unescapedValue.get());
+      } // if we have a attribute value
+
+    } // if we have a attribute name
+  } // if we got non-null search string and attribute name values
+
+  return attributeValue;
+}
+
+// nsIMsgI18NUrl support
+
+nsresult nsMailboxUrl::GetFolder(nsIMsgFolder **msgFolder)
+{
+  // if we have a RDF URI, then try to get the folder for that URI and then ask the folder
+  // for it's charset....
+  nsCString uri;
+  GetUri(getter_Copies(uri));
+  NS_ENSURE_TRUE(!uri.IsEmpty(), NS_ERROR_FAILURE);
+  nsCOMPtr<nsIMsgDBHdr> msg;
+  GetMsgDBHdrFromURI(uri.get(), getter_AddRefs(msg));
+  if (!msg)
+    return NS_ERROR_FAILURE;
+  return msg->GetFolder(msgFolder);
+}
+
+NS_IMETHODIMP nsMailboxUrl::GetFolderCharset(char ** aCharacterSet)
+{
+  NS_ENSURE_ARG_POINTER(aCharacterSet);
+  nsCOMPtr<nsIMsgFolder> folder;
+  nsresult rv = GetFolder(getter_AddRefs(folder));
+  
+  // In cases where a file is not associated with a folder, for
+  // example standalone .eml files, failure is normal.
+  if (NS_FAILED(rv))
+    return rv;
+  nsCString tmpStr;
+  folder->GetCharset(tmpStr);
+  *aCharacterSet = ToNewCString(tmpStr);
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsMailboxUrl::GetFolderCharsetOverride(bool * aCharacterSetOverride)
+{
+  nsCOMPtr<nsIMsgFolder> folder;
+  nsresult rv = GetFolder(getter_AddRefs(folder));
+  NS_ENSURE_SUCCESS(rv,rv);
+  NS_ENSURE_TRUE(folder, NS_ERROR_FAILURE);
+  folder->GetCharsetOverride(aCharacterSetOverride);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsMailboxUrl::GetCharsetOverRide(char ** aCharacterSet)
+{
+  if (!mCharsetOverride.IsEmpty())
+    *aCharacterSet = ToNewCString(mCharsetOverride);
+  else
+    *aCharacterSet = nullptr;
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsMailboxUrl::SetCharsetOverRide(const char * aCharacterSet)
+{
+  mCharsetOverride = aCharacterSet;
+  return NS_OK;
+}
+
+/* void setMoveCopyMsgKeys (out nsMsgKey keysToFlag, in long numKeys); */
+NS_IMETHODIMP nsMailboxUrl::SetMoveCopyMsgKeys(nsMsgKey *keysToFlag, int32_t numKeys)
+{
+  m_keys.ReplaceElementsAt(0, m_keys.Length(), keysToFlag, numKeys);
+  if (!m_keys.IsEmpty() && m_messageKey == nsMsgKey_None)
+    m_messageKey = m_keys[0];
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsMailboxUrl::GetMoveCopyMsgHdrForIndex(uint32_t msgIndex, nsIMsgDBHdr **msgHdr)
+{
+  NS_ENSURE_ARG(msgHdr);
+  if (msgIndex < m_keys.Length())
+  {
+    nsMsgKey nextKey = m_keys[msgIndex];
+    return GetMsgHdrForKey(nextKey, msgHdr);
+  }
+  return NS_MSG_MESSAGE_NOT_FOUND;
+}
+
+NS_IMETHODIMP nsMailboxUrl::GetNumMoveCopyMsgs(uint32_t *numMsgs)
+{
+  NS_ENSURE_ARG(numMsgs);
+  *numMsgs = m_keys.Length();
+  return NS_OK;
+}
diff --git a/mailnews/local/src/nsMailboxUrl.h b/mailnews/local/src/nsMailboxUrl.h
new file mode 100644
index 000000000..63973a916
--- /dev/null
+++ b/mailnews/local/src/nsMailboxUrl.h
@@ -0,0 +1,110 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsMailboxUrl_h__
+#define nsMailboxUrl_h__
+
+#include "mozilla/Attributes.h"
+#include "nsIMailboxUrl.h"
+#include "nsMsgMailNewsUrl.h"
+#include "nsIStreamListener.h"
+#include "nsIFile.h"
+#include "nsCOMPtr.h"
+#include "MailNewsTypes.h"
+#include "nsTArray.h"
+
+class nsMailboxUrl : public nsIMailboxUrl, public nsMsgMailNewsUrl, public nsIMsgMessageUrl, public nsIMsgI18NUrl
+{
+public:
+  // nsIURI over-ride...
+  NS_IMETHOD SetSpec(const nsACString &aSpec) override;
+  NS_IMETHOD SetQuery(const nsACString &aQuery) override;
+
+  // from nsIMailboxUrl:
+  NS_IMETHOD SetMailboxParser(nsIStreamListener * aConsumer) override;
+  NS_IMETHOD GetMailboxParser(nsIStreamListener ** aConsumer) override;
+  NS_IMETHOD SetMailboxCopyHandler(nsIStreamListener *  aConsumer) override;
+  NS_IMETHOD GetMailboxCopyHandler(nsIStreamListener ** aConsumer) override;
+
+  NS_IMETHOD GetMessageKey(nsMsgKey* aMessageKey) override;
+  NS_IMETHOD GetMessageSize(uint32_t *aMessageSize) override;
+  NS_IMETHOD SetMessageSize(uint32_t aMessageSize) override;
+  NS_IMETHOD GetMailboxAction(nsMailboxAction *result) override
+  {
+    NS_ENSURE_ARG_POINTER(result);
+    *result = m_mailboxAction;
+    return NS_OK;
+  }
+  NS_IMETHOD SetMailboxAction(nsMailboxAction aAction) override
+  {
+    m_mailboxAction = aAction;
+    return NS_OK;
+  }
+  NS_IMETHOD IsUrlType(uint32_t type, bool *isType) override;
+  NS_IMETHOD SetMoveCopyMsgKeys(nsMsgKey *keysToFlag, int32_t numKeys) override;
+  NS_IMETHOD GetMoveCopyMsgHdrForIndex(uint32_t msgIndex, nsIMsgDBHdr **msgHdr) override;
+  NS_IMETHOD GetNumMoveCopyMsgs(uint32_t *numMsgs) override;
+  NS_IMETHOD GetCurMoveCopyMsgIndex(uint32_t *result) override
+  {
+    NS_ENSURE_ARG_POINTER(result);
+    *result = m_curMsgIndex;
+    return NS_OK;
+  }
+  NS_IMETHOD SetCurMoveCopyMsgIndex(uint32_t aIndex) override
+  {
+    m_curMsgIndex = aIndex;
+    return NS_OK;
+  }
+
+  NS_IMETHOD GetFolder(nsIMsgFolder **msgFolder) override;
+
+  // nsIMsgMailNewsUrl override
+  NS_IMETHOD CloneInternal(uint32_t aRefHandlingMode,
+                           const nsACString& newRef,
+                           nsIURI **_retval) override;
+
+  // nsMailboxUrl
+  nsMailboxUrl();
+  NS_DECL_NSIMSGMESSAGEURL
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_NSIMSGI18NURL
+
+protected:
+  virtual ~nsMailboxUrl();
+  // protocol specific code to parse a url...
+  virtual nsresult ParseUrl();
+  nsresult GetMsgHdrForKey(nsMsgKey  msgKey, nsIMsgDBHdr ** aMsgHdr);
+
+  // mailboxurl specific state
+  nsCOMPtr<nsIStreamListener> m_mailboxParser;
+  nsCOMPtr<nsIStreamListener> m_mailboxCopyHandler;
+
+  nsMailboxAction m_mailboxAction; // the action this url represents...parse mailbox, display messages, etc.
+  nsCOMPtr <nsIFile>  m_filePath;
+  char *m_messageID;
+  uint32_t m_messageSize;
+  nsMsgKey m_messageKey;
+  nsCString m_file;
+  // This is currently only set when we're doing something with a .eml file.
+  // If that changes, we should change the name of this var.
+  nsCOMPtr<nsIMsgDBHdr> m_dummyHdr;
+
+  // used by save message to disk
+  nsCOMPtr<nsIFile> m_messageFile;
+  bool                  m_addDummyEnvelope;
+  bool                  m_canonicalLineEnding;
+  nsresult ParseSearchPart();
+
+  // for multiple msg move/copy
+  nsTArray<nsMsgKey> m_keys;
+  int32_t m_curMsgIndex;
+
+  // truncated message support
+  nsCString m_originalSpec;
+  nsCString mURI; // the RDF URI associated with this url.
+  nsCString mCharsetOverride; // used by nsIMsgI18NUrl...
+};
+
+#endif // nsMailboxUrl_h__
diff --git a/mailnews/local/src/nsMovemailIncomingServer.cpp b/mailnews/local/src/nsMovemailIncomingServer.cpp
new file mode 100644
index 000000000..cee915e25
--- /dev/null
+++ b/mailnews/local/src/nsMovemailIncomingServer.cpp
@@ -0,0 +1,178 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsMsgLocalCID.h"
+#include "nsMsgFolderFlags.h"
+#include "nsIMsgLocalMailFolder.h"
+#include "nsIMovemailService.h"
+#include "nsIFile.h"
+#include "msgCore.h" // pre-compiled headers
+#include "nsMovemailIncomingServer.h"
+#include "nsServiceManagerUtils.h"
+
+
+static NS_DEFINE_CID(kCMovemailServiceCID, NS_MOVEMAILSERVICE_CID);
+
+
+NS_IMPL_ISUPPORTS_INHERITED(nsMovemailIncomingServer,
+                             nsMsgIncomingServer,
+                             nsIMovemailIncomingServer,
+                             nsILocalMailIncomingServer)
+
+                            
+
+nsMovemailIncomingServer::nsMovemailIncomingServer()
+{    
+    m_canHaveFilters = true;
+}
+
+nsMovemailIncomingServer::~nsMovemailIncomingServer()
+{
+}
+
+NS_IMETHODIMP 
+nsMovemailIncomingServer::PerformBiff(nsIMsgWindow *aMsgWindow)
+{
+    nsresult rv;
+    nsCOMPtr<nsIMovemailService> movemailService(do_GetService(
+                                                 kCMovemailServiceCID, &rv));
+    if (NS_FAILED(rv)) return rv;
+    nsCOMPtr<nsIMsgFolder> inbox;
+    nsCOMPtr<nsIMsgFolder> rootMsgFolder;
+    nsCOMPtr<nsIUrlListener> urlListener;
+    rv = GetRootMsgFolder(getter_AddRefs(rootMsgFolder));
+    if(NS_SUCCEEDED(rv) && rootMsgFolder)
+    {
+         rootMsgFolder->GetFolderWithFlags(nsMsgFolderFlags::Inbox,
+                                           getter_AddRefs(inbox));
+         if (!inbox) return NS_ERROR_FAILURE;
+    }
+
+    SetPerformingBiff(true);
+    urlListener = do_QueryInterface(inbox);
+
+    bool downloadOnBiff = false;
+    rv = GetDownloadOnBiff(&downloadOnBiff);
+    if (downloadOnBiff)
+    {
+       nsCOMPtr <nsIMsgLocalMailFolder> localInbox = do_QueryInterface(inbox,
+                                                                       &rv);
+       if (localInbox && NS_SUCCEEDED(rv))
+       {
+           bool valid = false;
+           nsCOMPtr <nsIMsgDatabase> db;
+           rv = inbox->GetMsgDatabase(getter_AddRefs(db));
+           if (NS_SUCCEEDED(rv) && db)
+           {
+               rv = db->GetSummaryValid(&valid);
+           }
+           if (NS_SUCCEEDED(rv) && valid)
+           {
+               rv = movemailService->GetNewMail(aMsgWindow, urlListener, inbox,
+                                                this, nullptr);
+           }
+           else
+           {
+              bool isLocked;
+              inbox->GetLocked(&isLocked);
+              if (!isLocked)
+              {
+                 rv = localInbox->ParseFolder(aMsgWindow, urlListener);
+              }
+              if (NS_SUCCEEDED(rv))
+              {
+                 rv = localInbox->SetCheckForNewMessagesAfterParsing(true);
+              }
+           }
+       }
+    }
+    else
+    {
+        movemailService->CheckForNewMail(urlListener, inbox, this, nullptr); 
+    }
+
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsMovemailIncomingServer::SetFlagsOnDefaultMailboxes()
+{
+    nsCOMPtr<nsIMsgFolder> rootFolder;
+    nsresult rv = GetRootFolder(getter_AddRefs(rootFolder));
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    nsCOMPtr<nsIMsgLocalMailFolder> localFolder =
+        do_QueryInterface(rootFolder, &rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    return localFolder->SetFlagsOnDefaultMailboxes(nsMsgFolderFlags::SpecialUse);
+}
+
+NS_IMETHODIMP nsMovemailIncomingServer::CreateDefaultMailboxes()
+{
+  nsresult rv = CreateLocalFolder(NS_LITERAL_STRING("Inbox"));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  return CreateLocalFolder(NS_LITERAL_STRING("Trash"));
+}
+
+
+NS_IMETHODIMP
+nsMovemailIncomingServer::GetNewMail(nsIMsgWindow *aMsgWindow,
+                                     nsIUrlListener *aUrlListener,
+                                     nsIMsgFolder *aMsgFolder,
+                                     nsIURI **aResult)
+{
+    nsresult rv;
+    
+    nsCOMPtr<nsIMovemailService> movemailService = 
+             do_GetService(kCMovemailServiceCID, &rv);
+    
+    if (NS_FAILED(rv)) return rv;
+    
+    rv = movemailService->GetNewMail(aMsgWindow, aUrlListener,
+                                     aMsgFolder, this, aResult);
+
+    return rv;
+}        
+
+NS_IMETHODIMP
+nsMovemailIncomingServer::GetDownloadMessagesAtStartup(bool *getMessagesAtStartup)
+{
+    NS_ENSURE_ARG_POINTER(getMessagesAtStartup);
+    *getMessagesAtStartup = true;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsMovemailIncomingServer::GetCanBeDefaultServer(bool *aCanBeDefaultServer)
+{
+  NS_ENSURE_ARG_POINTER(aCanBeDefaultServer);
+  *aCanBeDefaultServer = true;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsMovemailIncomingServer::GetCanSearchMessages(bool *canSearchMessages)
+{
+    NS_ENSURE_ARG_POINTER(canSearchMessages);
+    *canSearchMessages = true;
+    return NS_OK;
+}
+
+NS_IMETHODIMP 
+nsMovemailIncomingServer::GetServerRequiresPasswordForBiff(bool *aServerRequiresPasswordForBiff)
+{
+    NS_ENSURE_ARG_POINTER(aServerRequiresPasswordForBiff);
+    *aServerRequiresPasswordForBiff = false;
+    return NS_OK;
+}
+
+NS_IMETHODIMP 
+nsMovemailIncomingServer::GetAccountManagerChrome(nsAString& aResult)
+{
+    aResult.AssignLiteral("am-main.xul");
+    return NS_OK;
+}
diff --git a/mailnews/local/src/nsMovemailIncomingServer.h b/mailnews/local/src/nsMovemailIncomingServer.h
new file mode 100644
index 000000000..7fefec965
--- /dev/null
+++ b/mailnews/local/src/nsMovemailIncomingServer.h
@@ -0,0 +1,40 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef __nsMovemailIncomingServer_h
+#define __nsMovemailIncomingServer_h
+
+#include "mozilla/Attributes.h"
+#include "msgCore.h"
+#include "nsIMovemailIncomingServer.h"
+#include "nsILocalMailIncomingServer.h"
+#include "nsMailboxServer.h"
+
+/* get some implementation from nsMsgIncomingServer */
+class nsMovemailIncomingServer : public nsMailboxServer,
+                                 public nsIMovemailIncomingServer,
+                                 public nsILocalMailIncomingServer
+
+{
+public:
+    NS_DECL_ISUPPORTS_INHERITED
+    NS_DECL_NSIMOVEMAILINCOMINGSERVER
+    NS_DECL_NSILOCALMAILINCOMINGSERVER
+
+    nsMovemailIncomingServer();
+
+    NS_IMETHOD PerformBiff(nsIMsgWindow *aMsgWindow) override;
+    NS_IMETHOD GetDownloadMessagesAtStartup(bool *getMessages) override;
+    NS_IMETHOD GetCanBeDefaultServer(bool *canBeDefaultServer) override;
+    NS_IMETHOD GetCanSearchMessages(bool *canSearchMessages) override;
+    NS_IMETHOD GetServerRequiresPasswordForBiff(bool *aServerRequiresPasswordForBiff) override;
+    NS_IMETHOD GetAccountManagerChrome(nsAString& aResult) override;
+
+private:
+    virtual ~nsMovemailIncomingServer();
+};
+
+
+#endif
diff --git a/mailnews/local/src/nsMovemailService.cpp b/mailnews/local/src/nsMovemailService.cpp
new file mode 100644
index 000000000..a4280c975
--- /dev/null
+++ b/mailnews/local/src/nsMovemailService.cpp
@@ -0,0 +1,694 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include <unistd.h>    // for link(), used in spool-file locking
+
+#include "prenv.h"
+#include "private/pprio.h"     // for our kernel-based locking
+#include "nspr.h"
+
+#include "msgCore.h"    // precompiled header...
+
+#include "nsMovemailService.h"
+#include "nsIMovemailService.h"
+#include "nsIMsgIncomingServer.h"
+#include "nsIMovemailIncomingServer.h"
+#include "nsIMsgProtocolInfo.h"
+#include "nsParseMailbox.h"
+#include "nsIMsgFolder.h"
+#include "nsIPrompt.h"
+
+#include "nsIFile.h"
+#include "nsMailDirServiceDefs.h"
+#include "nsMsgUtils.h"
+
+#include "nsCOMPtr.h"
+#include "nsMsgFolderFlags.h"
+
+#include "nsILineInputStream.h"
+#include "nsISeekableStream.h"
+#include "nsNetUtil.h"
+#include "nsAutoPtr.h"
+#include "nsIStringBundle.h"
+#include "nsIMsgPluggableStore.h"
+#include "mozilla/Services.h"
+#include "nsIInputStream.h"
+#include "nsIOutputStream.h"
+
+#include "mozilla/Logging.h"
+#if defined(PR_LOGGING)
+//
+// export NSPR_LOG_MODULES=Movemail:5
+//
+static PRLogModuleInfo *gMovemailLog = nullptr;
+#define LOG(args) MOZ_LOG(gMovemailLog, mozilla::LogLevel::Debug, args)
+#else
+#define LOG(args)
+#endif
+
+#define PREF_MAIL_ROOT_MOVEMAIL "mail.root.movemail"            // old - for backward compatibility only
+#define PREF_MAIL_ROOT_MOVEMAIL_REL "mail.root.movemail-rel"
+
+#define LOCK_SUFFIX ".lock"
+#define MOZLOCK_SUFFIX ".mozlock"
+
+const char * gDefaultSpoolPaths[] = {
+  "/var/spool/mail/",
+  "/usr/spool/mail/",
+  "/var/mail/",
+  "/usr/mail/"
+};
+#define NUM_DEFAULT_SPOOL_PATHS (sizeof(gDefaultSpoolPaths)/sizeof(gDefaultSpoolPaths[0]))
+
+namespace {
+class MOZ_STACK_CLASS SpoolLock
+{
+public:
+  /**
+   * Try to create a lock for the spool file while we operate on it.
+   *
+   * @param aSpoolName  The path to the spool file.
+   * @param aSeconds    The number of seconds to retry the locking.
+   * @param aMovemail   The movemail service requesting the lock.
+   * @param aServer     The nsIMsgIncomingServer requesting the lock.
+   */
+  SpoolLock(nsACString *aSpoolPath, int aSeconds, nsMovemailService &aMovemail,
+            nsIMsgIncomingServer *aServer);
+
+  ~SpoolLock();
+
+  bool isLocked();
+
+private:
+  bool mLocked;
+  nsCString mSpoolName;
+  bool mUsingLockFile;
+  RefPtr<nsMovemailService> mOwningService;
+  nsCOMPtr<nsIMsgIncomingServer> mServer;
+
+  bool ObtainSpoolLock(unsigned int aSeconds);
+  bool YieldSpoolLock();
+};
+
+}
+
+nsMovemailService::nsMovemailService()
+{
+#if defined(PR_LOGGING)
+  if (!gMovemailLog)
+      gMovemailLog = PR_NewLogModule("Movemail");
+#endif
+  LOG(("nsMovemailService created: 0x%x\n", this));
+}
+
+nsMovemailService::~nsMovemailService()
+{}
+
+
+NS_IMPL_ISUPPORTS(nsMovemailService,
+                   nsIMovemailService,
+                   nsIMsgProtocolInfo)
+
+
+NS_IMETHODIMP
+nsMovemailService::CheckForNewMail(nsIUrlListener * aUrlListener,
+                                   nsIMsgFolder *inbox,
+                                   nsIMovemailIncomingServer *movemailServer,
+                                   nsIURI ** aURL)
+{
+  nsresult rv = NS_OK;
+  LOG(("nsMovemailService::CheckForNewMail\n"));
+  return rv;
+}
+
+void
+nsMovemailService::Error(const char* errorCode,
+                         const char16_t **params,
+                         uint32_t length)
+{
+  if (!mMsgWindow) return;
+
+  nsCOMPtr<nsIPrompt> dialog;
+  nsresult rv = mMsgWindow->GetPromptDialog(getter_AddRefs(dialog));
+  if (NS_FAILED(rv))
+    return;
+
+  nsCOMPtr<nsIStringBundleService> bundleService =
+    mozilla::services::GetStringBundleService();
+  if (!bundleService)
+    return;
+  nsCOMPtr<nsIStringBundle> bundle;
+  rv = bundleService->CreateBundle("chrome://messenger/locale/localMsgs.properties", getter_AddRefs(bundle));
+  if (NS_FAILED(rv))
+    return;
+
+  nsString errStr;
+  // Format the error string if necessary
+  if (params)
+    bundle->FormatStringFromName(NS_ConvertASCIItoUTF16(errorCode).get(),
+                                 params, length, getter_Copies(errStr));
+  else
+    bundle->GetStringFromName(NS_ConvertASCIItoUTF16(errorCode).get(),
+                              getter_Copies(errStr));
+
+  if (!errStr.IsEmpty()) {
+    dialog->Alert(nullptr, errStr.get());
+  }
+}
+
+SpoolLock::SpoolLock(nsACString *aSpoolName, int aSeconds,
+                     nsMovemailService &aMovemail,
+                     nsIMsgIncomingServer *aServer)
+: mLocked(false),
+  mSpoolName(*aSpoolName),
+  mOwningService(&aMovemail),
+  mServer(aServer)
+{
+  if (!ObtainSpoolLock(aSeconds)) {
+    NS_ConvertUTF8toUTF16 lockFile(mSpoolName);
+    lockFile.AppendLiteral(LOCK_SUFFIX);
+    const char16_t* params[] = { lockFile.get() };
+    mOwningService->Error("movemailCantCreateLock", params, 1);
+    return;
+  }
+  mServer->SetServerBusy(true);
+  mLocked = true;
+}
+
+SpoolLock::~SpoolLock() {
+  if (mLocked && !YieldSpoolLock()) {
+    NS_ConvertUTF8toUTF16 lockFile(mSpoolName);
+    lockFile.AppendLiteral(LOCK_SUFFIX);
+    const char16_t* params[] = { lockFile.get() };
+    mOwningService->Error("movemailCantDeleteLock", params, 1);
+  }
+  mServer->SetServerBusy(false);
+}
+
+bool
+SpoolLock::isLocked() {
+  return mLocked;
+}
+
+bool
+SpoolLock::ObtainSpoolLock(unsigned int aSeconds /* number of seconds to retry */)
+{
+  /*
+   * Locking procedures:
+   * If the directory is not writable, we want to use the appropriate system
+   * utilites to lock the file.
+   * If the directory is writable, we want to go through the create-and-link
+   * locking procedures to make it atomic for certain networked file systems.
+   * This involves creating a .mozlock file and attempting to hard-link it to
+   * the customary .lock file.
+   */
+  nsCOMPtr<nsIFile> spoolFile;
+  nsresult rv = NS_NewNativeLocalFile(mSpoolName,
+                                      true,
+                                      getter_AddRefs(spoolFile));
+  NS_ENSURE_SUCCESS(rv, false);
+
+  nsCOMPtr<nsIFile> directory;
+  rv = spoolFile->GetParent(getter_AddRefs(directory));
+  NS_ENSURE_SUCCESS(rv, false);
+
+  rv = directory->IsWritable(&mUsingLockFile);
+  NS_ENSURE_SUCCESS(rv, false);
+
+  if (!mUsingLockFile) {
+    LOG(("Attempting to use kernel file lock"));
+    PRFileDesc *fd;
+    rv = spoolFile->OpenNSPRFileDesc(PR_RDWR, 0, &fd);
+    NS_ENSURE_SUCCESS(rv, false);
+    PRStatus lock_result;
+    unsigned int retry_count = 0;
+
+    do {
+      lock_result = PR_TLockFile(fd);
+  
+      retry_count++;
+      LOG(("Attempt %d of %d to lock file", retry_count, aSeconds));
+      if (aSeconds > 0 && lock_result == PR_FAILURE) {
+        // pause 1sec, waiting for .lock to go away
+        PRIntervalTime sleepTime = 1000; // 1 second
+        PR_Sleep(sleepTime);
+      }
+    } while (lock_result == PR_FAILURE && retry_count < aSeconds);
+    LOG(("Lock result: %d", lock_result));
+    PR_Close(fd);
+    return lock_result == PR_SUCCESS;
+  }
+  // How to lock using files:
+  // step 1: create SPOOLNAME.mozlock
+  //        1a: can remove it if it already exists (probably crash-droppings)
+  // step 2: hard-link SPOOLNAME.mozlock to SPOOLNAME.lock for NFS atomicity
+  //        2a: if SPOOLNAME.lock is >60sec old then nuke it from orbit
+  //        2b: repeat step 2 until retry-count expired or hard-link succeeds
+  // step 3: remove SPOOLNAME.mozlock
+  // step 4: If step 2 hard-link failed, fail hard; we do not hold the lock
+  // DONE.
+  //
+  // (step 2a not yet implemented)
+
+  nsAutoCString mozlockstr(mSpoolName);
+  mozlockstr.AppendLiteral(MOZLOCK_SUFFIX);
+  nsAutoCString lockstr(mSpoolName);
+  lockstr.AppendLiteral(LOCK_SUFFIX);
+
+  // Create nsIFile for the spool.mozlock file
+  nsCOMPtr<nsIFile> tmplocfile;
+  rv = NS_NewNativeLocalFile(mozlockstr, true, getter_AddRefs(tmplocfile));
+  NS_ENSURE_SUCCESS(rv, false);
+
+  // THOUGHT: hmm, perhaps use MakeUnique to generate us a unique mozlock?
+  // ... perhaps not, MakeUnique implementation looks racey -- use mktemp()?
+
+  // step 1: create SPOOLNAME.mozlock
+  rv = tmplocfile->Create(nsIFile::NORMAL_FILE_TYPE, 0666);
+  if (NS_FAILED(rv) && rv != NS_ERROR_FILE_ALREADY_EXISTS) {
+    // can't create our .mozlock file... game over already
+    LOG(("Failed to create file %s\n", mozlockstr.get()));
+    return false;
+  }
+
+  // step 2: hard-link .mozlock file to .lock file (this wackiness
+  //         is necessary for non-racey locking on NFS-mounted spool dirs)
+  // n.b. XPCOM utilities don't support hard-linking yet, so we
+  // skip out to <unistd.h> and the POSIX interface for link()
+  int link_result = 0;
+  unsigned int retry_count = 0;
+
+  do {
+    link_result = link(mozlockstr.get(), lockstr.get());
+
+    retry_count++;
+    LOG(("Attempt %d of %d to create lock file", retry_count, aSeconds));
+
+    if (aSeconds > 0 && link_result == -1) {
+      // pause 1sec, waiting for .lock to go away
+      PRIntervalTime sleepTime = 1000; // 1 second
+      PR_Sleep(sleepTime);
+    }
+  } while (link_result == -1 && retry_count < aSeconds);
+  LOG(("Link result: %d", link_result));
+
+  // step 3: remove .mozlock file, in any case
+  rv = tmplocfile->Remove(false /* non-recursive */);
+  if (NS_FAILED(rv)) {
+    // Could not delete our .mozlock file... very unusual, but
+    // not fatal.
+    LOG(("Unable to delete %s", mozlockstr.get()));
+  }
+
+  // step 4: now we know whether we succeeded or failed
+  return link_result == 0;
+}
+
+
+/**
+ * Remove our mail-spool-file lock (n.b. we should only try this if
+ * we're the ones who made the lock in the first place! I.e. if mLocked is true.)
+ */
+bool
+SpoolLock::YieldSpoolLock()
+{
+  LOG(("YieldSpoolLock(%s)", mSpoolName.get()));
+
+  if (!mUsingLockFile) {
+    nsCOMPtr<nsIFile> spoolFile;
+    nsresult rv = NS_NewNativeLocalFile(mSpoolName,
+                                        true,
+                                        getter_AddRefs(spoolFile));
+    NS_ENSURE_SUCCESS(rv, false);
+
+    PRFileDesc *fd;
+    rv = spoolFile->OpenNSPRFileDesc(PR_RDWR, 0, &fd);
+    NS_ENSURE_SUCCESS(rv, false);
+
+    bool unlockSucceeded = PR_UnlockFile(fd) == PR_SUCCESS;
+    PR_Close(fd);
+    if (unlockSucceeded)
+      LOG(("YieldSpoolLock was successful."));
+    return unlockSucceeded;
+  }
+
+  nsAutoCString lockstr(mSpoolName);
+  lockstr.AppendLiteral(LOCK_SUFFIX);
+
+  nsresult rv;
+
+  // Create nsIFile for the spool.lock file
+  nsCOMPtr<nsIFile> locklocfile;
+  rv = NS_NewNativeLocalFile(lockstr, true, getter_AddRefs(locklocfile));
+  NS_ENSURE_SUCCESS(rv, false);
+
+  // Check if the lock file exists
+  bool exists;
+  rv = locklocfile->Exists(&exists);
+  NS_ENSURE_SUCCESS(rv, false);
+
+  // Delete the file if it exists
+  if (exists) {
+    rv = locklocfile->Remove(false /* non-recursive */);
+    NS_ENSURE_SUCCESS(rv, false);
+  }
+
+  LOG(("YieldSpoolLock was successful."));
+
+  // Success.
+  return true;
+}
+
+static nsresult
+LocateSpoolFile(nsACString & spoolPath)
+{
+  bool isFile;
+  nsresult rv;
+
+  nsCOMPtr<nsIFile> spoolFile;
+  rv = NS_NewNativeLocalFile(EmptyCString(), true, getter_AddRefs(spoolFile));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  char * mailEnv = PR_GetEnv("MAIL");
+  char * userEnv = PR_GetEnv("USER");
+  if (!userEnv)
+    userEnv = PR_GetEnv("USERNAME");
+
+  if (mailEnv) {
+    rv = spoolFile->InitWithNativePath(nsDependentCString(mailEnv));
+    NS_ENSURE_SUCCESS(rv, rv);
+    rv = spoolFile->IsFile(&isFile);
+    if (NS_SUCCEEDED(rv) && isFile)
+      spoolPath = mailEnv;
+  }
+  else if (userEnv) {
+    // Try to build the mailbox path from the username and a number
+    // of guessed spool directory paths.
+    nsAutoCString tmpPath;
+    uint32_t i;
+    for (i = 0; i < NUM_DEFAULT_SPOOL_PATHS; i++) {
+      tmpPath = gDefaultSpoolPaths[i];
+      tmpPath += userEnv;
+      rv = spoolFile->InitWithNativePath(tmpPath);
+      NS_ENSURE_SUCCESS(rv, rv);
+      rv = spoolFile->IsFile(&isFile);
+      if (NS_SUCCEEDED(rv) && isFile) {
+        spoolPath = tmpPath;
+        break;
+      }
+    }
+  }
+
+  return rv;
+}
+
+nsresult
+nsMovemailService::GetNewMail(nsIMsgWindow *aMsgWindow,
+                              nsIUrlListener* /* aUrlListener */,
+                              nsIMsgFolder* /* aMsgFolder */,
+                              nsIMovemailIncomingServer *aMovemailServer,
+                              nsIURI ** /* aURL */)
+{
+  LOG(("nsMovemailService::GetNewMail"));
+
+  NS_ENSURE_ARG_POINTER(aMovemailServer);
+  // It is OK if aMsgWindow is null.
+  mMsgWindow = aMsgWindow;
+
+  nsresult rv;
+
+  nsCOMPtr<nsIMsgIncomingServer> in_server =
+      do_QueryInterface(aMovemailServer, &rv);
+  NS_ENSURE_TRUE(NS_SUCCEEDED(rv) && in_server,
+    NS_MSG_INVALID_OR_MISSING_SERVER);
+
+  // Attempt to locate the mail spool file
+  nsAutoCString spoolPath;
+  rv = in_server->GetCharValue("spoolDir", spoolPath);
+  if (NS_FAILED(rv) || spoolPath.IsEmpty())
+    rv = LocateSpoolFile(spoolPath);
+  if (NS_FAILED(rv) || spoolPath.IsEmpty()) {
+    Error("movemailSpoolFileNotFound", nullptr, 0);
+    return NS_ERROR_FAILURE;
+  }
+
+  NS_ConvertUTF8toUTF16 wideSpoolPath(spoolPath);
+  const char16_t* spoolPathString[] = { wideSpoolPath.get() };
+
+  // Create an input stream for the spool file
+  nsCOMPtr<nsIFile> spoolFile;
+  rv = NS_NewNativeLocalFile(spoolPath, true, getter_AddRefs(spoolFile));
+  NS_ENSURE_SUCCESS(rv, rv);
+  nsCOMPtr<nsIInputStream> spoolInputStream;
+  rv = NS_NewLocalFileInputStream(getter_AddRefs(spoolInputStream), spoolFile);
+  if (NS_FAILED(rv)) {
+    Error("movemailCantOpenSpoolFile", spoolPathString, 1);
+    return rv;
+  }
+
+  // Get a line input interface for the spool file
+  nsCOMPtr<nsILineInputStream> lineInputStream =
+    do_QueryInterface(spoolInputStream, &rv);
+  NS_ENSURE_TRUE(NS_SUCCEEDED(rv) && lineInputStream, rv);
+
+  nsCOMPtr<nsIMsgFolder> serverFolder;
+  nsCOMPtr<nsIMsgFolder> inbox;
+
+  rv = in_server->GetRootFolder(getter_AddRefs(serverFolder));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = serverFolder->GetFolderWithFlags(nsMsgFolderFlags::Inbox,
+                                        getter_AddRefs(inbox));
+  NS_ENSURE_TRUE(NS_SUCCEEDED(rv) && inbox, rv);
+
+  nsCOMPtr<nsIMsgPluggableStore> msgStore;
+  rv = in_server->GetMsgStore(getter_AddRefs(msgStore));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // create a new mail parser
+  RefPtr<nsParseNewMailState> newMailParser = new nsParseNewMailState;
+
+  // Try and obtain the lock for the spool file.
+  SpoolLock lock(&spoolPath, 5, *this, in_server);
+  if (!lock.isLocked())
+    return NS_ERROR_FAILURE;
+
+  nsCOMPtr<nsIMsgDBHdr> newHdr;
+  nsCOMPtr<nsIOutputStream> outputStream;
+
+  // MIDDLE of the FUN : consume the mailbox data.
+  bool isMore = true;
+  nsAutoCString buffer;
+  uint32_t bytesWritten = 0;
+  while (isMore &&
+         NS_SUCCEEDED(lineInputStream->ReadLine(buffer, &isMore)))
+  {
+    // If first string is empty and we're now at EOF then abort parsing.
+    if (buffer.IsEmpty() && !isMore && !bytesWritten) {
+      LOG(("Empty spool file"));
+      break;
+    }
+
+    buffer.AppendLiteral(MSG_LINEBREAK);
+
+    if (isMore && StringBeginsWith(buffer, NS_LITERAL_CSTRING("From "))) {
+      // Finish previous header and message, if any.
+      if (newHdr) {
+        outputStream->Flush();
+        newMailParser->PublishMsgHeader(nullptr);
+        rv = msgStore->FinishNewMessage(outputStream, newHdr);
+        NS_ENSURE_SUCCESS(rv, rv);
+        newMailParser->Clear();
+      }
+      bool reusable;
+      rv = msgStore->GetNewMsgOutputStream(inbox, getter_AddRefs(newHdr),
+                                           &reusable, getter_AddRefs(outputStream));
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      rv = newMailParser->Init(serverFolder, inbox,
+                               nullptr, newHdr, outputStream);
+      NS_ENSURE_SUCCESS(rv, rv);
+    }
+    if (!outputStream) {
+      // If we do not have outputStream here, something bad happened.
+      // We probably didn't find the proper message start delimiter "From "
+      // and are now reading in the middle of a message. Bail out.
+      Error("movemailCantParseSpool", spoolPathString, 1);
+      return NS_ERROR_UNEXPECTED;
+    }
+
+    newMailParser->HandleLine(buffer.BeginWriting(), buffer.Length());
+    rv = outputStream->Write(buffer.get(), buffer.Length(), &bytesWritten);
+    NS_ENSURE_TRUE(NS_SUCCEEDED(rv) && (bytesWritten == buffer.Length()),
+                   NS_ERROR_FAILURE);
+
+    // "From " lines delimit messages, start a new one here.
+    if (isMore && StringBeginsWith(buffer, NS_LITERAL_CSTRING("From "))) {
+      buffer.AssignLiteral("X-Mozilla-Status: 8000" MSG_LINEBREAK);
+      newMailParser->HandleLine(buffer.BeginWriting(), buffer.Length());
+      rv = outputStream->Write(buffer.get(), buffer.Length(), &bytesWritten);
+      NS_ENSURE_TRUE(NS_SUCCEEDED(rv) && (bytesWritten == buffer.Length()),
+                     NS_ERROR_FAILURE);
+
+      buffer.AssignLiteral("X-Mozilla-Status2: 00000000" MSG_LINEBREAK);
+      newMailParser->HandleLine(buffer.BeginWriting(), buffer.Length());
+      rv = outputStream->Write(buffer.get(), buffer.Length(), &bytesWritten);
+      NS_ENSURE_TRUE(NS_SUCCEEDED(rv) && (bytesWritten == buffer.Length()),
+                     NS_ERROR_FAILURE);
+    }
+  }
+  if (outputStream) {
+    outputStream->Flush();
+    newMailParser->PublishMsgHeader(nullptr);
+    newMailParser->OnStopRequest(nullptr, nullptr, NS_OK);
+    rv = msgStore->FinishNewMessage(outputStream, newHdr);
+    NS_ENSURE_SUCCESS(rv, rv);
+    outputStream->Close();
+  }
+  // Truncate the spool file as we parsed it successfully.
+  rv = spoolFile->SetFileSize(0);
+  if (NS_FAILED(rv)) {
+    Error("movemailCantTruncateSpoolFile", spoolPathString, 1);
+  }
+
+  LOG(("GetNewMail returning rv=%d", rv));
+  return rv;
+}
+
+
+NS_IMETHODIMP
+nsMovemailService::SetDefaultLocalPath(nsIFile *aPath)
+{
+  NS_ENSURE_ARG(aPath);
+  return NS_SetPersistentFile(PREF_MAIL_ROOT_MOVEMAIL_REL, PREF_MAIL_ROOT_MOVEMAIL, aPath);
+}
+
+NS_IMETHODIMP
+nsMovemailService::GetDefaultLocalPath(nsIFile ** aResult)
+{
+  NS_ENSURE_ARG_POINTER(aResult);
+  *aResult = nullptr;
+
+  nsresult rv;
+  bool havePref;
+  nsCOMPtr<nsIFile> localFile;
+  rv = NS_GetPersistentFile(PREF_MAIL_ROOT_MOVEMAIL_REL,
+                            PREF_MAIL_ROOT_MOVEMAIL,
+                            NS_APP_MAIL_50_DIR,
+                            havePref,
+                            getter_AddRefs(localFile));
+  if (NS_FAILED(rv)) return rv;
+
+  bool exists;
+  rv = localFile->Exists(&exists);
+  if (NS_SUCCEEDED(rv) && !exists)
+    rv = localFile->Create(nsIFile::DIRECTORY_TYPE, 0775);
+  if (NS_FAILED(rv)) return rv;
+
+  if (!havePref || !exists) {
+    rv = NS_SetPersistentFile(PREF_MAIL_ROOT_MOVEMAIL_REL, PREF_MAIL_ROOT_MOVEMAIL, localFile);
+    NS_ASSERTION(NS_SUCCEEDED(rv), "Failed to set root dir pref.");
+  }
+
+  NS_IF_ADDREF(*aResult = localFile);
+  return NS_OK;
+}
+
+
+NS_IMETHODIMP
+nsMovemailService::GetServerIID(nsIID* *aServerIID)
+{
+  *aServerIID = new nsIID(NS_GET_IID(nsIMovemailIncomingServer));
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsMovemailService::GetRequiresUsername(bool *aRequiresUsername)
+{
+  NS_ENSURE_ARG_POINTER(aRequiresUsername);
+  *aRequiresUsername = false;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsMovemailService::GetPreflightPrettyNameWithEmailAddress(bool *aPreflightPrettyNameWithEmailAddress)
+{
+  NS_ENSURE_ARG_POINTER(aPreflightPrettyNameWithEmailAddress);
+  *aPreflightPrettyNameWithEmailAddress = true;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsMovemailService::GetCanLoginAtStartUp(bool *aCanLoginAtStartUp)
+{
+  NS_ENSURE_ARG_POINTER(aCanLoginAtStartUp);
+  *aCanLoginAtStartUp = true;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsMovemailService::GetCanDelete(bool *aCanDelete)
+{
+  NS_ENSURE_ARG_POINTER(aCanDelete);
+  *aCanDelete = true;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsMovemailService::GetCanGetMessages(bool *aCanGetMessages)
+{
+  NS_ENSURE_ARG_POINTER(aCanGetMessages);
+  *aCanGetMessages = true;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsMovemailService::GetCanGetIncomingMessages(bool *aCanGetIncomingMessages)
+{
+  NS_ENSURE_ARG_POINTER(aCanGetIncomingMessages);
+  *aCanGetIncomingMessages = true;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsMovemailService::GetCanDuplicate(bool *aCanDuplicate)
+{
+  NS_ENSURE_ARG_POINTER(aCanDuplicate);
+  *aCanDuplicate = false;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsMovemailService::GetDefaultDoBiff(bool *aDoBiff)
+{
+  NS_ENSURE_ARG_POINTER(aDoBiff);
+  // by default, do biff for movemail
+  *aDoBiff = true;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsMovemailService::GetDefaultServerPort(bool isSecure, int32_t *aDefaultPort)
+{
+  NS_ENSURE_ARG_POINTER(aDefaultPort);
+  *aDefaultPort = -1;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsMovemailService::GetShowComposeMsgLink(bool *showComposeMsgLink)
+{
+  NS_ENSURE_ARG_POINTER(showComposeMsgLink);
+  *showComposeMsgLink = true;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsMovemailService::GetFoldersCreatedAsync(bool *aAsyncCreation)
+{
+  NS_ENSURE_ARG_POINTER(aAsyncCreation);
+  *aAsyncCreation = false;
+  return NS_OK;
+}
diff --git a/mailnews/local/src/nsMovemailService.h b/mailnews/local/src/nsMovemailService.h
new file mode 100644
index 000000000..5b1ae1053
--- /dev/null
+++ b/mailnews/local/src/nsMovemailService.h
@@ -0,0 +1,32 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsMovemailService_h___
+#define nsMovemailService_h___
+
+#include "nscore.h"
+#include "nsCOMPtr.h"
+
+#include "nsIMovemailService.h"
+#include "nsIMsgProtocolInfo.h"
+#include "nsIMsgWindow.h"
+
+class nsMovemailService : public nsIMsgProtocolInfo, public nsIMovemailService
+{
+public:
+  nsMovemailService();
+
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIMOVEMAILSERVICE
+  NS_DECL_NSIMSGPROTOCOLINFO
+
+  void Error(const char* errorCode, const char16_t **params, uint32_t length);
+
+private:
+  virtual ~nsMovemailService();
+  nsCOMPtr<nsIMsgWindow> mMsgWindow;
+};
+
+#endif /* nsMovemailService_h___ */
diff --git a/mailnews/local/src/nsMsgBrkMBoxStore.cpp b/mailnews/local/src/nsMsgBrkMBoxStore.cpp
new file mode 100644
index 000000000..6eb3063ad
--- /dev/null
+++ b/mailnews/local/src/nsMsgBrkMBoxStore.cpp
@@ -0,0 +1,1124 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+   Class for handling Berkeley Mailbox stores.
+*/
+
+#include "prlog.h"
+#include "msgCore.h"
+#include "nsMsgBrkMBoxStore.h"
+#include "nsIMsgFolder.h"
+#include "nsMsgFolderFlags.h"
+#include "nsILocalMailIncomingServer.h"
+#include "nsIMsgLocalMailFolder.h"
+#include "nsCOMArray.h"
+#include "nsIFile.h"
+#include "nsIMsgHdr.h"
+#include "nsNetUtil.h"
+#include "nsIMsgDatabase.h"
+#include "nsNativeCharsetUtils.h"
+#include "nsMsgUtils.h"
+#include "nsMsgDBCID.h"
+#include "nsIDBFolderInfo.h"
+#include "nsIArray.h"
+#include "nsArrayUtils.h"
+#include "nsMsgLocalFolderHdrs.h"
+#include "nsMailHeaders.h"
+#include "nsReadLine.h"
+#include "nsParseMailbox.h"
+#include "nsIMailboxService.h"
+#include "nsMsgLocalCID.h"
+#include "nsIMsgFolderCompactor.h"
+#include "nsIPrefService.h"
+#include "nsIPrefBranch.h"
+#include "mozilla/Preferences.h"
+#include "prprf.h"
+#include <cstdlib> // for std::abs(int/long)
+#include <cmath> // for std::abs(float/double)
+
+nsMsgBrkMBoxStore::nsMsgBrkMBoxStore()
+{
+}
+
+nsMsgBrkMBoxStore::~nsMsgBrkMBoxStore()
+{
+}
+
+NS_IMPL_ISUPPORTS(nsMsgBrkMBoxStore, nsIMsgPluggableStore)
+
+NS_IMETHODIMP nsMsgBrkMBoxStore::DiscoverSubFolders(nsIMsgFolder *aParentFolder,
+                                                    bool aDeep)
+{
+  NS_ENSURE_ARG_POINTER(aParentFolder);
+
+  nsCOMPtr<nsIFile> path;
+  nsresult rv = aParentFolder->GetFilePath(getter_AddRefs(path));
+  if (NS_FAILED(rv))
+    return rv;
+
+  bool exists;
+  path->Exists(&exists);
+  if (!exists) {
+    rv = path->Create(nsIFile::DIRECTORY_TYPE, 0755);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  return AddSubFolders(aParentFolder, path, aDeep);
+}
+
+NS_IMETHODIMP nsMsgBrkMBoxStore::CreateFolder(nsIMsgFolder *aParent,
+                                              const nsAString &aFolderName,
+                                              nsIMsgFolder **aResult)
+{
+  NS_ENSURE_ARG_POINTER(aParent);
+  NS_ENSURE_ARG_POINTER(aResult);
+  if (aFolderName.IsEmpty())
+    return NS_MSG_ERROR_INVALID_FOLDER_NAME;
+
+  nsCOMPtr<nsIFile> path;
+  nsCOMPtr<nsIMsgFolder> child;
+  nsresult rv = aParent->GetFilePath(getter_AddRefs(path));
+  if (NS_FAILED(rv))
+    return rv;
+  //Get a directory based on our current path.
+  rv = CreateDirectoryForFolder(path);
+  if (NS_FAILED(rv))
+    return rv;
+
+  // Now we have a valid directory or we have returned.
+  // Make sure the new folder name is valid
+  nsAutoString safeFolderName(aFolderName);
+  NS_MsgHashIfNecessary(safeFolderName);
+
+  path->Append(safeFolderName);
+  bool exists;
+  path->Exists(&exists);
+  if (exists) //check this because localized names are different from disk names
+    return NS_MSG_FOLDER_EXISTS;
+
+  rv = path->Create(nsIFile::NORMAL_FILE_TYPE, 0600);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  //GetFlags and SetFlags in AddSubfolder will fail because we have no db at
+  // this point but mFlags is set.
+  rv = aParent->AddSubfolder(safeFolderName, getter_AddRefs(child));
+  if (!child || NS_FAILED(rv))
+  {
+    path->Remove(false);
+    return rv;
+  }
+  // Create an empty database for this mail folder, set its name from the user
+  nsCOMPtr<nsIMsgDBService> msgDBService =
+    do_GetService(NS_MSGDB_SERVICE_CONTRACTID, &rv);
+  if (msgDBService)
+  {
+    nsCOMPtr<nsIMsgDatabase> unusedDB;
+    rv = msgDBService->OpenFolderDB(child, true, getter_AddRefs(unusedDB));
+    if (rv == NS_MSG_ERROR_FOLDER_SUMMARY_MISSING)
+      rv = msgDBService->CreateNewDB(child, getter_AddRefs(unusedDB));
+
+    if ((NS_SUCCEEDED(rv) || rv == NS_MSG_ERROR_FOLDER_SUMMARY_OUT_OF_DATE) &&
+        unusedDB)
+    {
+      //need to set the folder name
+      nsCOMPtr<nsIDBFolderInfo> folderInfo;
+      rv = unusedDB->GetDBFolderInfo(getter_AddRefs(folderInfo));
+      if (NS_SUCCEEDED(rv))
+        folderInfo->SetMailboxName(safeFolderName);
+
+      unusedDB->SetSummaryValid(true);
+      unusedDB->Close(true);
+      aParent->UpdateSummaryTotals(true);
+    }
+    else
+    {
+      path->Remove(false);
+      rv = NS_MSG_CANT_CREATE_FOLDER;
+    }
+  }
+  child.forget(aResult);
+  return rv;
+}
+
+// Get the current attributes of the mbox file, corrected for caching
+void nsMsgBrkMBoxStore::GetMailboxModProperties(nsIMsgFolder *aFolder,
+                                                int64_t *aSize, uint32_t *aDate)
+{
+  // We'll simply return 0 on errors.
+  *aDate = 0;
+  *aSize = 0;
+  nsCOMPtr<nsIFile> pathFile;
+  nsresult rv = aFolder->GetFilePath(getter_AddRefs(pathFile));
+  NS_ENSURE_SUCCESS_VOID(rv);
+
+  rv = pathFile->GetFileSize(aSize);
+  if (NS_FAILED(rv))
+    return; // expected result for virtual folders
+
+  PRTime lastModTime;
+  rv = pathFile->GetLastModifiedTime(&lastModTime);
+  NS_ENSURE_SUCCESS_VOID(rv);
+
+  *aDate = (uint32_t) (lastModTime / PR_MSEC_PER_SEC);
+}
+
+NS_IMETHODIMP nsMsgBrkMBoxStore::HasSpaceAvailable(nsIMsgFolder *aFolder,
+                                                   int64_t aSpaceRequested,
+                                                   bool *aResult)
+{
+  NS_ENSURE_ARG_POINTER(aResult);
+  NS_ENSURE_ARG_POINTER(aFolder);
+
+  nsCOMPtr<nsIFile> pathFile;
+  nsresult rv = aFolder->GetFilePath(getter_AddRefs(pathFile));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  bool allow4GBfolders = mozilla::Preferences::GetBool("mailnews.allowMboxOver4GB", true);
+
+  if (!allow4GBfolders) {
+    // Allow the mbox to only reach 0xFFC00000 = 4 GiB - 4 MiB.
+    int64_t fileSize;
+    rv = pathFile->GetFileSize(&fileSize);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    *aResult = ((fileSize + aSpaceRequested) < 0xFFC00000LL);
+    if (!*aResult)
+      return NS_ERROR_FILE_TOO_BIG;
+  }
+
+  *aResult = DiskSpaceAvailableInStore(pathFile, aSpaceRequested);
+  if (!*aResult)
+    return NS_ERROR_FILE_DISK_FULL;
+
+  return NS_OK;
+}
+
+static bool gGotGlobalPrefs = false;
+static int32_t gTimeStampLeeway = 60;
+
+NS_IMETHODIMP nsMsgBrkMBoxStore::IsSummaryFileValid(nsIMsgFolder *aFolder,
+                                                    nsIMsgDatabase *aDB,
+                                                    bool *aResult)
+{
+  NS_ENSURE_ARG_POINTER(aFolder);
+  NS_ENSURE_ARG_POINTER(aDB);
+  NS_ENSURE_ARG_POINTER(aResult);
+  // We only check local folders for db validity.
+  nsCOMPtr<nsIMsgLocalMailFolder> localFolder(do_QueryInterface(aFolder));
+  if (!localFolder)
+  {
+    *aResult = true;
+    return NS_OK;
+  }
+
+  nsCOMPtr<nsIFile> pathFile;
+  nsresult rv = aFolder->GetFilePath(getter_AddRefs(pathFile));
+  NS_ENSURE_SUCCESS(rv, rv);
+  nsCOMPtr<nsIDBFolderInfo> folderInfo;
+  rv = aDB->GetDBFolderInfo(getter_AddRefs(folderInfo));
+  NS_ENSURE_SUCCESS(rv, rv);
+  int64_t folderSize;
+  uint32_t folderDate;
+  int32_t numUnreadMessages;
+
+  *aResult = false;
+
+  folderInfo->GetNumUnreadMessages(&numUnreadMessages);
+  folderInfo->GetFolderSize(&folderSize);
+  folderInfo->GetFolderDate(&folderDate);
+
+  int64_t fileSize = 0;
+  uint32_t actualFolderTimeStamp = 0;
+  GetMailboxModProperties(aFolder, &fileSize, &actualFolderTimeStamp);
+
+  if (folderSize == fileSize && numUnreadMessages >= 0)
+  {
+    if (!folderSize)
+    {
+      *aResult = true;
+      return NS_OK;
+    }
+    if (!gGotGlobalPrefs)
+    {
+      nsCOMPtr<nsIPrefBranch> pPrefBranch(do_GetService(NS_PREFSERVICE_CONTRACTID));
+      if (pPrefBranch)
+      {
+        rv = pPrefBranch->GetIntPref("mail.db_timestamp_leeway", &gTimeStampLeeway);
+        gGotGlobalPrefs = true;
+      }
+    }
+    // if those values are ok, check time stamp
+    if (gTimeStampLeeway == 0)
+      *aResult = folderDate == actualFolderTimeStamp;
+    else
+      *aResult = std::abs((int32_t) (actualFolderTimeStamp - folderDate)) <= gTimeStampLeeway;
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsMsgBrkMBoxStore::SetSummaryFileValid(nsIMsgFolder *aFolder,
+                                                     nsIMsgDatabase *aDB,
+                                                     bool aValid)
+{
+  NS_ENSURE_ARG_POINTER(aFolder);
+  NS_ENSURE_ARG_POINTER(aDB);
+  // We only need to do this for local folders.
+  nsCOMPtr<nsIMsgLocalMailFolder> localFolder(do_QueryInterface(aFolder));
+  if (!localFolder)
+    return NS_OK;
+
+  nsCOMPtr<nsIFile> pathFile;
+  nsresult rv = aFolder->GetFilePath(getter_AddRefs(pathFile));
+  NS_ENSURE_SUCCESS(rv, rv);
+  nsCOMPtr<nsIDBFolderInfo> folderInfo;
+  rv = aDB->GetDBFolderInfo(getter_AddRefs(folderInfo));
+  NS_ENSURE_SUCCESS(rv, rv);
+  bool exists;
+  pathFile->Exists(&exists);
+  if (!exists)
+    return NS_MSG_ERROR_FOLDER_MISSING;
+
+  if (aValid)
+  {
+    uint32_t actualFolderTimeStamp;
+    int64_t fileSize;
+    GetMailboxModProperties(aFolder, &fileSize, &actualFolderTimeStamp);
+    folderInfo->SetFolderSize(fileSize);
+    folderInfo->SetFolderDate(actualFolderTimeStamp);
+  }
+  else
+  {
+    folderInfo->SetVersion(0); // that ought to do the trick.
+  }
+  aDB->Commit(nsMsgDBCommitType::kLargeCommit);
+  return rv;
+}
+
+NS_IMETHODIMP nsMsgBrkMBoxStore::DeleteFolder(nsIMsgFolder *aFolder)
+{
+  NS_ENSURE_ARG_POINTER(aFolder);
+  //Delete mailbox
+  nsCOMPtr<nsIFile> pathFile;
+  nsresult rv = aFolder->GetFilePath(getter_AddRefs(pathFile));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  pathFile->Remove(false);
+
+  bool isDirectory = false;
+  pathFile->IsDirectory(&isDirectory);
+  if (!isDirectory)
+  {
+    nsAutoString leafName;
+    pathFile->GetLeafName(leafName);
+    leafName.AppendLiteral(FOLDER_SUFFIX);
+    pathFile->SetLeafName(leafName);
+  }
+  isDirectory = false;
+  pathFile->IsDirectory(&isDirectory);
+  //If this is a directory, then remove it.
+  return isDirectory ? pathFile->Remove(true) : NS_OK;
+}
+
+NS_IMETHODIMP nsMsgBrkMBoxStore::RenameFolder(nsIMsgFolder *aFolder,
+                                              const nsAString & aNewName,
+                                              nsIMsgFolder **aNewFolder)
+{
+  NS_ENSURE_ARG_POINTER(aFolder);
+  NS_ENSURE_ARG_POINTER(aNewFolder);
+
+  uint32_t numChildren;
+  aFolder->GetNumSubFolders(&numChildren);
+  nsString existingName;
+  aFolder->GetName(existingName);
+
+  nsCOMPtr<nsIFile> oldPathFile;
+  nsresult rv = aFolder->GetFilePath(getter_AddRefs(oldPathFile));
+  if (NS_FAILED(rv))
+    return rv;
+
+  nsCOMPtr<nsIMsgFolder> parentFolder;
+  rv = aFolder->GetParent(getter_AddRefs(parentFolder));
+  if (!parentFolder)
+    return NS_ERROR_NULL_POINTER;
+
+  nsCOMPtr<nsISupports> parentSupport = do_QueryInterface(parentFolder);
+
+  nsCOMPtr<nsIFile> oldSummaryFile;
+  rv = aFolder->GetSummaryFile(getter_AddRefs(oldSummaryFile));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsIFile> dirFile;
+  oldPathFile->Clone(getter_AddRefs(dirFile));
+
+  if (numChildren > 0)
+  {
+    rv = CreateDirectoryForFolder(dirFile);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  nsAutoString safeName(aNewName);
+  NS_MsgHashIfNecessary(safeName);
+
+  nsAutoCString oldLeafName;
+  oldPathFile->GetNativeLeafName(oldLeafName);
+
+  nsCOMPtr<nsIFile> parentPathFile;
+  parentFolder->GetFilePath(getter_AddRefs(parentPathFile));
+  NS_ENSURE_SUCCESS(rv,rv);
+
+  bool isDirectory = false;
+  parentPathFile->IsDirectory(&isDirectory);
+  if (!isDirectory)
+  {
+    nsAutoString leafName;
+    parentPathFile->GetLeafName(leafName);
+    leafName.AppendLiteral(FOLDER_SUFFIX);
+    rv = parentPathFile->SetLeafName(leafName);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  aFolder->ForceDBClosed();
+  //save off dir name before appending .msf
+  rv = oldPathFile->MoveTo(nullptr, safeName);
+  if (NS_FAILED(rv))
+    return rv;
+
+  nsString dbName(safeName);
+  dbName += NS_LITERAL_STRING(SUMMARY_SUFFIX);
+  oldSummaryFile->MoveTo(nullptr, dbName);
+
+  if (numChildren > 0)
+  {
+    // rename "*.sbd" directory
+    nsAutoString newNameDirStr(safeName);
+    newNameDirStr += NS_LITERAL_STRING(".sbd");
+    dirFile->MoveTo(nullptr, newNameDirStr);
+  }
+
+  return parentFolder->AddSubfolder(safeName, aNewFolder);
+}
+
+NS_IMETHODIMP nsMsgBrkMBoxStore::CopyFolder(nsIMsgFolder *aSrcFolder,
+                                            nsIMsgFolder *aDstFolder,
+                                            bool aIsMoveFolder,
+                                            nsIMsgWindow *aMsgWindow,
+                                            nsIMsgCopyServiceListener *aListener,
+                                            const nsAString &aNewName)
+{
+  NS_ENSURE_ARG_POINTER(aSrcFolder);
+  NS_ENSURE_ARG_POINTER(aDstFolder);
+
+  nsAutoString folderName;
+  if (aNewName.IsEmpty())
+    aSrcFolder->GetName(folderName);
+  else
+    folderName.Assign(aNewName);
+
+  nsAutoString safeFolderName(folderName);
+  NS_MsgHashIfNecessary(safeFolderName);
+  nsCOMPtr<nsIMsgLocalMailFolder> localSrcFolder(do_QueryInterface(aSrcFolder));
+  nsCOMPtr<nsIMsgDatabase> srcDB;
+  if (localSrcFolder)
+    localSrcFolder->GetDatabaseWOReparse(getter_AddRefs(srcDB));
+  bool summaryValid = !!srcDB;
+  srcDB = nullptr;
+  aSrcFolder->ForceDBClosed();
+
+  nsCOMPtr<nsIFile> oldPath;
+  nsresult rv = aSrcFolder->GetFilePath(getter_AddRefs(oldPath));
+  NS_ENSURE_SUCCESS(rv,rv);
+
+  nsCOMPtr<nsIFile> summaryFile;
+  GetSummaryFileLocation(oldPath, getter_AddRefs(summaryFile));
+
+  nsCOMPtr<nsIFile> newPath;
+  rv = aDstFolder->GetFilePath(getter_AddRefs(newPath));
+  NS_ENSURE_SUCCESS(rv,rv);
+
+  bool newPathIsDirectory = false;
+  newPath->IsDirectory(&newPathIsDirectory);
+  if (!newPathIsDirectory)
+  {
+    AddDirectorySeparator(newPath);
+    rv = newPath->Create(nsIFile::DIRECTORY_TYPE, 0700);
+    if (rv == NS_ERROR_FILE_ALREADY_EXISTS)
+      rv = NS_OK;
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  nsCOMPtr<nsIFile> origPath;
+  oldPath->Clone(getter_AddRefs(origPath));
+
+   //copying necessary for aborting.... if failure return
+  rv = oldPath->CopyTo(newPath, safeFolderName);
+  NS_ENSURE_SUCCESS(rv, rv); // Will fail if a file by that name exists
+
+  // Copy to dir can fail if filespec does not exist. If copy fails, we test
+  // if the filespec exist or not, if it does not that's ok, we continue
+  // without copying it. If it fails and filespec exist and is not zero sized
+  // there is real problem
+  // Copy the file to the new dir
+  nsAutoString dbName(safeFolderName);
+  dbName += NS_LITERAL_STRING(SUMMARY_SUFFIX);
+  rv = summaryFile->CopyTo(newPath, dbName);
+  if (NS_FAILED(rv)) // Test if the copy is successful
+  {
+    // Test if the filespec has data
+    bool exists;
+    int64_t fileSize;
+    summaryFile->Exists(&exists);
+    summaryFile->GetFileSize(&fileSize);
+    if (exists && fileSize > 0)
+      NS_ENSURE_SUCCESS(rv, rv); // Yes, it should have worked !
+    // else case is filespec is zero sized, no need to copy it,
+    // not an error
+  }
+
+  nsCOMPtr<nsIMsgFolder> newMsgFolder;
+  rv = aDstFolder->AddSubfolder(safeFolderName, getter_AddRefs(newMsgFolder));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // linux and mac are not good about maintaining the file stamp when copying
+  // folders around. So if the source folder db is good, set the dest db as
+  // good too.
+  nsCOMPtr<nsIMsgDatabase> destDB;
+  if (summaryValid)
+  {
+    nsAutoString folderLeafName;
+    origPath->GetLeafName(folderLeafName);
+    newPath->Append(folderLeafName);
+    nsCOMPtr<nsIMsgDBService> msgDBService =
+      do_GetService(NS_MSGDB_SERVICE_CONTRACTID, &rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+    rv = msgDBService->OpenMailDBFromFile(newPath, newMsgFolder, false,
+                                          true, getter_AddRefs(destDB));
+    if (rv == NS_MSG_ERROR_FOLDER_SUMMARY_OUT_OF_DATE && destDB)
+      destDB->SetSummaryValid(true);
+  }
+  newMsgFolder->SetPrettyName(folderName);
+  uint32_t flags;
+  aSrcFolder->GetFlags(&flags);
+  newMsgFolder->SetFlags(flags);
+  bool changed = false;
+  rv = aSrcFolder->MatchOrChangeFilterDestination(newMsgFolder, true, &changed);
+  if (changed)
+    aSrcFolder->AlertFilterChanged(aMsgWindow);
+
+  nsCOMPtr<nsISimpleEnumerator> enumerator;
+  rv = aSrcFolder->GetSubFolders(getter_AddRefs(enumerator));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // Copy subfolders to the new location
+  nsresult copyStatus = NS_OK;
+  nsCOMPtr<nsIMsgLocalMailFolder> localNewFolder(do_QueryInterface(newMsgFolder, &rv));
+  if (NS_SUCCEEDED(rv))
+  {
+    bool hasMore;
+    while (NS_SUCCEEDED(enumerator->HasMoreElements(&hasMore)) && hasMore &&
+           NS_SUCCEEDED(copyStatus))
+    {
+      nsCOMPtr<nsISupports> item;
+      enumerator->GetNext(getter_AddRefs(item));
+
+      nsCOMPtr<nsIMsgFolder> folder(do_QueryInterface(item));
+      if (!folder)
+        continue;
+
+      copyStatus = localNewFolder->CopyFolderLocal(folder, false,
+                                                   aMsgWindow, aListener);
+      // Test if the call succeeded, if not we have to stop recursive call
+      if (NS_FAILED(copyStatus))
+      {
+        // Copy failed we have to notify caller to handle the error and stop
+        // moving the folders. In case this happens to the topmost level of
+        // recursive call, then we just need to break from the while loop and
+        // go to error handling code.
+        if (!aIsMoveFolder)
+          return copyStatus;
+        break;
+      }
+    }
+  }
+
+  if (aIsMoveFolder && NS_SUCCEEDED(copyStatus))
+  {
+    if (localNewFolder)
+    {
+      nsCOMPtr<nsISupports> srcSupport(do_QueryInterface(aSrcFolder));
+      localNewFolder->OnCopyCompleted(srcSupport, true);
+    }
+
+    // Notify the "folder" that was dragged and dropped has been created. No
+    // need to do this for its subfolders. isMoveFolder will be true for folder.
+    aDstFolder->NotifyItemAdded(newMsgFolder);
+
+    nsCOMPtr<nsIMsgFolder> msgParent;
+    aSrcFolder->GetParent(getter_AddRefs(msgParent));
+    aSrcFolder->SetParent(nullptr);
+    if (msgParent)
+    {
+      // The files have already been moved, so delete storage false
+      msgParent->PropagateDelete(aSrcFolder, false, aMsgWindow);
+      oldPath->Remove(false);  //berkeley mailbox
+     // We need to force closed the source db
+      nsCOMPtr<nsIMsgDatabase> srcDB;
+      aSrcFolder->Delete();
+
+      nsCOMPtr<nsIFile> parentPath;
+      rv = msgParent->GetFilePath(getter_AddRefs(parentPath));
+      NS_ENSURE_SUCCESS(rv,rv);
+
+      AddDirectorySeparator(parentPath);
+      nsCOMPtr<nsISimpleEnumerator> children;
+      parentPath->GetDirectoryEntries(getter_AddRefs(children));
+      bool more;
+      // checks if the directory is empty or not
+      if (children && NS_SUCCEEDED(children->HasMoreElements(&more)) && !more)
+        parentPath->Remove(true);
+    }
+  }
+  else
+  {
+    // This is the case where the copy of a subfolder failed.
+    // We have to delete the newDirectory tree to make a "rollback".
+    // Someone should add a popup to warn the user that the move was not
+    // possible.
+    if (aIsMoveFolder && NS_FAILED(copyStatus))
+    {
+      nsCOMPtr<nsIMsgFolder> msgParent;
+      newMsgFolder->ForceDBClosed();
+      newMsgFolder->GetParent(getter_AddRefs(msgParent));
+      newMsgFolder->SetParent(nullptr);
+      if (msgParent)
+      {
+        msgParent->PropagateDelete(newMsgFolder, false, aMsgWindow);
+        newMsgFolder->Delete();
+        newMsgFolder->ForceDBClosed();
+        AddDirectorySeparator(newPath);
+        newPath->Remove(true);  //berkeley mailbox
+      }
+      return NS_ERROR_FAILURE;
+    }
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsMsgBrkMBoxStore::GetNewMsgOutputStream(nsIMsgFolder *aFolder,
+                                         nsIMsgDBHdr **aNewMsgHdr,
+                                         bool *aReusable,
+                                         nsIOutputStream **aResult)
+{
+  NS_ENSURE_ARG_POINTER(aFolder);
+  NS_ENSURE_ARG_POINTER(aNewMsgHdr);
+  NS_ENSURE_ARG_POINTER(aReusable);
+  NS_ENSURE_ARG_POINTER(aResult);
+
+#ifdef _DEBUG
+  NS_ASSERTION(m_streamOutstandingFolder != aFolder, "didn't finish prev msg");
+  m_streamOutstandingFolder = aFolder;
+#endif
+  *aReusable = true;
+  nsCOMPtr<nsIFile> mboxFile;
+  aFolder->GetFilePath(getter_AddRefs(mboxFile));
+  nsCOMPtr<nsIMsgDatabase> db;
+  aFolder->GetMsgDatabase(getter_AddRefs(db));
+  if (!db && !*aNewMsgHdr)
+    NS_WARNING("no db, and no message header");
+  bool exists;
+  nsresult rv;
+  mboxFile->Exists(&exists);
+  if (!exists) {
+    rv = mboxFile->Create(nsIFile::NORMAL_FILE_TYPE, 0600);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  nsCString URI;
+  aFolder->GetURI(URI);
+  nsCOMPtr<nsISeekableStream> seekable;
+  if (m_outputStreams.Get(URI, aResult))
+  {
+    seekable = do_QueryInterface(*aResult, &rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+    rv = seekable->Seek(nsISeekableStream::NS_SEEK_END, 0);
+    if (NS_FAILED(rv))
+    {
+      m_outputStreams.Remove(URI);
+      NS_RELEASE(*aResult);
+    }
+  }
+  if (!*aResult)
+  {
+    rv = MsgGetFileStream(mboxFile, aResult);
+    NS_ASSERTION(NS_SUCCEEDED(rv), "failed opening offline store for output");
+    if (NS_FAILED(rv))
+      printf("failed opening offline store for %s\n", URI.get());
+    NS_ENSURE_SUCCESS(rv, rv);
+    seekable = do_QueryInterface(*aResult, &rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+    rv = seekable->Seek(nsISeekableStream::NS_SEEK_END, 0);
+    NS_ENSURE_SUCCESS(rv, rv);
+    m_outputStreams.Put(URI, *aResult);
+  }
+  int64_t filePos;
+  seekable->Tell(&filePos);
+
+  if (db && !*aNewMsgHdr)
+  {
+    db->CreateNewHdr(nsMsgKey_None, aNewMsgHdr);
+  }
+
+  if (*aNewMsgHdr)
+  {
+    char storeToken[100];
+    PR_snprintf(storeToken, sizeof(storeToken), "%lld", filePos);
+    (*aNewMsgHdr)->SetMessageOffset(filePos);
+    (*aNewMsgHdr)->SetStringProperty("storeToken", storeToken);
+  }
+  return rv;
+}
+
+NS_IMETHODIMP
+nsMsgBrkMBoxStore::DiscardNewMessage(nsIOutputStream *aOutputStream,
+                                     nsIMsgDBHdr *aNewHdr)
+{
+  NS_ENSURE_ARG_POINTER(aOutputStream);
+  NS_ENSURE_ARG_POINTER(aNewHdr);
+#ifdef _DEBUG
+  m_streamOutstandingFolder = nullptr;
+#endif
+  uint64_t hdrOffset;
+  aNewHdr->GetMessageOffset(&hdrOffset);
+  aOutputStream->Close();
+  nsCOMPtr<nsIFile> mboxFile;
+  nsCOMPtr<nsIMsgFolder> folder;
+  nsresult rv = aNewHdr->GetFolder(getter_AddRefs(folder));
+  NS_ENSURE_SUCCESS(rv, rv);
+  folder->GetFilePath(getter_AddRefs(mboxFile));
+  return mboxFile->SetFileSize(hdrOffset);
+}
+
+NS_IMETHODIMP
+nsMsgBrkMBoxStore::FinishNewMessage(nsIOutputStream *aOutputStream,
+                                     nsIMsgDBHdr *aNewHdr)
+{
+#ifdef _DEBUG
+  m_streamOutstandingFolder = nullptr;
+#endif
+  NS_ENSURE_ARG_POINTER(aOutputStream);
+//  NS_ENSURE_ARG_POINTER(aNewHdr);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsMsgBrkMBoxStore::MoveNewlyDownloadedMessage(nsIMsgDBHdr *aNewHdr,
+                                              nsIMsgFolder *aDestFolder,
+                                              bool *aResult)
+{
+  NS_ENSURE_ARG_POINTER(aNewHdr);
+  NS_ENSURE_ARG_POINTER(aDestFolder);
+  NS_ENSURE_ARG_POINTER(aResult);
+  *aResult = false;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsMsgBrkMBoxStore::GetMsgInputStream(nsIMsgFolder *aMsgFolder,
+                                     const nsACString &aMsgToken,
+                                     int64_t *aOffset,
+                                     nsIMsgDBHdr *aMsgHdr,
+                                     bool *aReusable,
+                                     nsIInputStream **aResult)
+{
+  NS_ENSURE_ARG_POINTER(aMsgFolder);
+  NS_ENSURE_ARG_POINTER(aResult);
+  NS_ENSURE_ARG_POINTER(aOffset);
+
+  // If there is no store token, then we set it to the existing message offset.
+  if (aMsgToken.IsEmpty())
+  {
+    uint64_t offset;
+    NS_ENSURE_ARG_POINTER(aMsgHdr);
+    aMsgHdr->GetMessageOffset(&offset);
+    *aOffset = int64_t(offset);
+    char storeToken[100];
+    PR_snprintf(storeToken, sizeof(storeToken), "%lld", *aOffset);
+    aMsgHdr->SetStringProperty("storeToken", storeToken);
+  }
+  else
+    *aOffset = ParseUint64Str(PromiseFlatCString(aMsgToken).get());
+  *aReusable = true;
+  nsCString URI;
+  nsCOMPtr<nsIFile> mboxFile;
+
+  aMsgFolder->GetURI(URI);
+  aMsgFolder->GetFilePath(getter_AddRefs(mboxFile));
+  return NS_NewLocalFileInputStream(aResult, mboxFile);
+}
+
+NS_IMETHODIMP nsMsgBrkMBoxStore::DeleteMessages(nsIArray *aHdrArray)
+{
+  return ChangeFlags(aHdrArray, nsMsgMessageFlags::Expunged, true);
+}
+
+NS_IMETHODIMP
+nsMsgBrkMBoxStore::CopyMessages(bool isMove, nsIArray *aHdrArray,
+                               nsIMsgFolder *aDstFolder,
+                               nsIMsgCopyServiceListener *aListener,
+                               nsIArray **aDstHdrs,
+                               nsITransaction **aUndoAction,
+                               bool *aCopyDone)
+{
+  NS_ENSURE_ARG_POINTER(aHdrArray);
+  NS_ENSURE_ARG_POINTER(aDstFolder);
+  NS_ENSURE_ARG_POINTER(aDstHdrs);
+  NS_ENSURE_ARG_POINTER(aCopyDone);
+  *aDstHdrs = nullptr;
+  *aUndoAction = nullptr;
+  *aCopyDone = false;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsMsgBrkMBoxStore::GetSupportsCompaction(bool *aSupportsCompaction)
+{
+  NS_ENSURE_ARG_POINTER(aSupportsCompaction);
+  *aSupportsCompaction = true;
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsMsgBrkMBoxStore::CompactFolder(nsIMsgFolder *aFolder,
+                                               nsIUrlListener *aListener,
+                                               nsIMsgWindow *aMsgWindow)
+{
+  NS_ENSURE_ARG_POINTER(aFolder);
+  nsresult rv;
+  nsCOMPtr<nsIMsgFolderCompactor> folderCompactor =
+    do_CreateInstance(NS_MSGLOCALFOLDERCOMPACTOR_CONTRACTID, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  int64_t expungedBytes = 0;
+  aFolder->GetExpungedBytes(&expungedBytes);
+  // check if we need to compact the folder
+  return (expungedBytes > 0) ?
+    folderCompactor->Compact(aFolder, false, aListener, aMsgWindow) :
+    aFolder->NotifyCompactCompleted();
+}
+
+NS_IMETHODIMP nsMsgBrkMBoxStore::RebuildIndex(nsIMsgFolder *aFolder,
+                                              nsIMsgDatabase *aMsgDB,
+                                              nsIMsgWindow *aMsgWindow,
+                                              nsIUrlListener *aListener)
+{
+  NS_ENSURE_ARG_POINTER(aFolder);
+  nsCOMPtr<nsIFile> pathFile;
+  nsresult rv = aFolder->GetFilePath(getter_AddRefs(pathFile));
+  if (NS_FAILED(rv))
+    return rv;
+
+  bool isLocked;
+  aFolder->GetLocked(&isLocked);
+  if (isLocked)
+  {
+    NS_ASSERTION(false, "Could not get folder lock");
+    return NS_MSG_FOLDER_BUSY;
+  }
+
+  nsCOMPtr<nsIMailboxService> mailboxService =
+    do_GetService(NS_MAILBOXSERVICE_CONTRACTID1, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  RefPtr<nsMsgMailboxParser> parser = new nsMsgMailboxParser(aFolder);
+  NS_ENSURE_TRUE(parser, NS_ERROR_OUT_OF_MEMORY);
+  rv = parser->Init();
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = mailboxService->ParseMailbox(aMsgWindow, pathFile, parser, aListener,
+                                    nullptr);
+  if (NS_SUCCEEDED(rv))
+    ResetForceReparse(aMsgDB);
+  return rv;
+}
+
+nsresult
+nsMsgBrkMBoxStore::GetOutputStream(nsIArray *aHdrArray,
+                                   nsCOMPtr<nsIOutputStream> &outputStream,
+                                   nsCOMPtr<nsISeekableStream> &seekableStream,
+                                   int64_t &restorePos)
+{
+  nsresult rv;
+  nsCOMPtr<nsIMsgDBHdr> msgHdr = do_QueryElementAt(aHdrArray, 0, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+  nsCOMPtr<nsIMsgFolder> folder;
+  msgHdr->GetFolder(getter_AddRefs(folder));
+  NS_ENSURE_SUCCESS(rv, rv);
+  nsCString URI;
+  folder->GetURI(URI);
+  restorePos = -1;
+  if (m_outputStreams.Get(URI, getter_AddRefs(outputStream)))
+  {
+    seekableStream = do_QueryInterface(outputStream);
+    rv = seekableStream->Tell(&restorePos);
+    if (NS_FAILED(rv))
+    {
+      outputStream = nullptr;
+      m_outputStreams.Remove(URI);
+    }
+  }
+  nsCOMPtr<nsIFile> mboxFile;
+  folder->GetFilePath(getter_AddRefs(mboxFile));
+  if (!outputStream)
+  {
+    rv = MsgGetFileStream(mboxFile, getter_AddRefs(outputStream));
+    seekableStream = do_QueryInterface(outputStream);
+    if (NS_SUCCEEDED(rv))
+      m_outputStreams.Put(URI, outputStream);
+  }
+  return rv;
+}
+
+void nsMsgBrkMBoxStore::SetDBValid(nsIMsgDBHdr *aHdr)
+{
+  nsCOMPtr<nsIMsgFolder> folder;
+  aHdr->GetFolder(getter_AddRefs(folder));
+  if (folder)
+  {
+    nsCOMPtr<nsIMsgDatabase> db;
+    folder->GetMsgDatabase(getter_AddRefs(db));
+    if (db)
+      SetSummaryFileValid(folder, db, true);
+  }
+}
+
+NS_IMETHODIMP nsMsgBrkMBoxStore::ChangeFlags(nsIArray *aHdrArray,
+                                             uint32_t aFlags,
+                                             bool aSet)
+{
+  NS_ENSURE_ARG_POINTER(aHdrArray);
+  nsCOMPtr<nsIOutputStream> outputStream;
+  nsCOMPtr<nsISeekableStream> seekableStream;
+  int64_t restoreStreamPos;
+
+  uint32_t messageCount;
+  nsresult rv = aHdrArray->GetLength(&messageCount);
+  NS_ENSURE_SUCCESS(rv, rv);
+  if (!messageCount)
+    return NS_ERROR_INVALID_ARG;
+
+  rv = GetOutputStream(aHdrArray, outputStream, seekableStream,
+                       restoreStreamPos);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsIMsgDBHdr> msgHdr;
+  for (uint32_t i = 0; i < messageCount; i++)
+  {
+    msgHdr = do_QueryElementAt(aHdrArray, i, &rv);
+    // Seek to x-mozilla-status offset and rewrite value.
+    rv = UpdateFolderFlag(msgHdr, aSet, aFlags, outputStream);
+    if (NS_FAILED(rv))
+    {
+      NS_WARNING("updateFolderFlag failed");
+      break;
+    }
+  }
+  if (restoreStreamPos != -1)
+    seekableStream->Seek(nsISeekableStream::NS_SEEK_SET, restoreStreamPos);
+  else if (outputStream)
+    outputStream->Close();
+  if (messageCount > 0)
+  {
+    msgHdr = do_QueryElementAt(aHdrArray, 0);
+    SetDBValid(msgHdr);
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsMsgBrkMBoxStore::ChangeKeywords(nsIArray *aHdrArray,
+                                             const nsACString &aKeywords,
+                                             bool aAdd)
+{
+  NS_ENSURE_ARG_POINTER(aHdrArray);
+  nsCOMPtr<nsIOutputStream> outputStream;
+  nsCOMPtr<nsISeekableStream> seekableStream;
+  int64_t restoreStreamPos;
+
+  uint32_t messageCount;
+  nsresult rv = aHdrArray->GetLength(&messageCount);
+  NS_ENSURE_SUCCESS(rv, rv);
+  if (!messageCount)
+    return NS_ERROR_INVALID_ARG;
+
+  rv = GetOutputStream(aHdrArray, outputStream, seekableStream,
+                       restoreStreamPos);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsIInputStream> inputStream = do_QueryInterface(outputStream, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsAutoPtr<nsLineBuffer<char> > lineBuffer(new nsLineBuffer<char>);
+  NS_ENSURE_TRUE(lineBuffer, NS_ERROR_OUT_OF_MEMORY);
+
+  // For each message, we seek to the beginning of the x-mozilla-status header,
+  // and start reading lines, looking for x-mozilla-keys: headers; If we're
+  // adding the keyword and we find
+  // a header with the desired keyword already in it, we don't need to
+  // do anything. Likewise, if removing keyword and we don't find it,
+  // we don't need to do anything. Otherwise, if adding, we need to
+  // see if there's an x-mozilla-keys
+  // header with room for the new keyword. If so, we replace the
+  // corresponding number of spaces with the keyword. If no room,
+  // we can't do anything until the folder is compacted and another
+  // x-mozilla-keys header is added. In that case, we set a property
+  // on the header, which the compaction code will check.
+
+  nsTArray<nsCString> keywordArray;
+  ParseString(aKeywords, ' ', keywordArray);
+
+  nsCOMPtr<nsIMsgDBHdr> msgHdr;
+  for (uint32_t i = 0; i < messageCount; ++i) // for each message
+  {
+    msgHdr = do_QueryElementAt(aHdrArray, i, &rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+    uint64_t messageOffset;
+    msgHdr->GetMessageOffset(&messageOffset);
+    uint32_t statusOffset = 0;
+    (void)msgHdr->GetStatusOffset(&statusOffset);
+    uint64_t desiredOffset = messageOffset + statusOffset;
+
+    ChangeKeywordsHelper(msgHdr, desiredOffset, lineBuffer, keywordArray,
+                         aAdd, outputStream, seekableStream, inputStream);
+  }
+  lineBuffer = nullptr;
+  if (restoreStreamPos != -1)
+    seekableStream->Seek(nsISeekableStream::NS_SEEK_SET, restoreStreamPos);
+  else if (outputStream)
+    outputStream->Close();
+  if (messageCount > 0)
+  {
+    msgHdr = do_QueryElementAt(aHdrArray, 0);
+    SetDBValid(msgHdr);
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsMsgBrkMBoxStore::GetStoreType(nsACString& aType)
+{
+  aType.AssignLiteral("mbox");
+  return NS_OK;
+}
+
+// Iterates over the files in the "path" directory, and adds subfolders to
+// parent for each mailbox file found.
+nsresult
+nsMsgBrkMBoxStore::AddSubFolders(nsIMsgFolder *parent, nsCOMPtr<nsIFile> &path,
+                                 bool deep)
+{
+  nsresult rv;
+  nsCOMPtr<nsIFile> tmp; // at top level so we can safely assign to path
+  bool isDirectory;
+  path->IsDirectory(&isDirectory);
+  if (!isDirectory)
+  {
+    rv = path->Clone(getter_AddRefs(tmp));
+    path = tmp;
+    NS_ENSURE_SUCCESS(rv, rv);
+    nsAutoString leafName;
+    path->GetLeafName(leafName);
+    leafName.AppendLiteral(".sbd");
+    path->SetLeafName(leafName);
+    path->IsDirectory(&isDirectory);
+  }
+  if (!isDirectory)
+    return NS_OK;
+  // first find out all the current subfolders and files, before using them
+  // while creating new subfolders; we don't want to modify and iterate the same
+  // directory at once.
+  nsCOMArray<nsIFile> currentDirEntries;
+  nsCOMPtr<nsISimpleEnumerator> directoryEnumerator;
+  rv = path->GetDirectoryEntries(getter_AddRefs(directoryEnumerator));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  bool hasMore;
+  while (NS_SUCCEEDED(directoryEnumerator->HasMoreElements(&hasMore)) &&
+         hasMore)
+  {
+    nsCOMPtr<nsISupports> aSupport;
+    directoryEnumerator->GetNext(getter_AddRefs(aSupport));
+    nsCOMPtr<nsIFile> currentFile(do_QueryInterface(aSupport, &rv));
+    if (currentFile)
+      currentDirEntries.AppendObject(currentFile);
+  }
+
+  // add the folders
+  int32_t count = currentDirEntries.Count();
+  for (int32_t i = 0; i < count; ++i)
+  {
+    nsCOMPtr<nsIFile> currentFile(currentDirEntries[i]);
+
+    nsAutoString leafName;
+    currentFile->GetLeafName(leafName);
+    directoryEnumerator->HasMoreElements(&hasMore);
+    // here we should handle the case where the current file is a .sbd directory
+    // w/o a matching folder file, or a directory w/o the name .sbd
+    if (nsShouldIgnoreFile(leafName))
+      continue;
+
+    nsCOMPtr<nsIMsgFolder> child;
+    rv = parent->AddSubfolder(leafName, getter_AddRefs(child));
+    if (child)
+    {
+      nsString folderName;
+      child->GetName(folderName);  // try to get it from cache/db
+      if (folderName.IsEmpty())
+        child->SetPrettyName(leafName);
+      if (deep)
+      {
+        nsCOMPtr<nsIFile> path;
+        rv = child->GetFilePath(getter_AddRefs(path));
+        AddSubFolders(child, path, true);
+      }
+    }
+  }
+  return rv == NS_MSG_FOLDER_EXISTS ? NS_OK : rv;
+}
+
+/* Finds the directory associated with this folder.  That is if the path is
+   c:\Inbox, it will return c:\Inbox.sbd if it succeeds.  If that path doesn't
+   currently exist then it will create it. Path is strictly an out parameter.
+  */
+nsresult nsMsgBrkMBoxStore::CreateDirectoryForFolder(nsIFile *path)
+{
+  nsresult rv = NS_OK;
+
+  bool pathIsDirectory = false;
+  path->IsDirectory(&pathIsDirectory);
+  if (!pathIsDirectory)
+  {
+    // If the current path isn't a directory, add directory separator
+    // and test it out.
+    nsAutoString leafName;
+    path->GetLeafName(leafName);
+    leafName.AppendLiteral(FOLDER_SUFFIX);
+    rv = path->SetLeafName(leafName);
+    if (NS_FAILED(rv))
+      return rv;
+
+    //If that doesn't exist, then we have to create this directory
+    pathIsDirectory = false;
+    path->IsDirectory(&pathIsDirectory);
+    if (!pathIsDirectory)
+    {
+      bool pathExists;
+      path->Exists(&pathExists);
+      //If for some reason there's a file with the directory separator
+      //then we are going to fail.
+      rv = pathExists ? NS_MSG_COULD_NOT_CREATE_DIRECTORY :
+             path->Create(nsIFile::DIRECTORY_TYPE, 0700);
+    }
+  }
+  return rv;
+}
+
diff --git a/mailnews/local/src/nsMsgBrkMBoxStore.h b/mailnews/local/src/nsMsgBrkMBoxStore.h
new file mode 100644
index 000000000..4d10e672d
--- /dev/null
+++ b/mailnews/local/src/nsMsgBrkMBoxStore.h
@@ -0,0 +1,50 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+   Class for handling Berkeley Mailbox stores.
+*/
+
+#ifndef nsMsgBrkMboxStore_h__
+#define nsMsgBrkMboxStore_h__
+
+#include "nsMsgLocalStoreUtils.h"
+#include "nsIFile.h"
+#include "nsInterfaceHashtable.h"
+#include "nsISeekableStream.h"
+
+class nsMsgBrkMBoxStore final : public nsMsgLocalStoreUtils, nsIMsgPluggableStore
+{
+public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIMSGPLUGGABLESTORE
+
+  nsMsgBrkMBoxStore();
+
+private:
+  ~nsMsgBrkMBoxStore();
+
+protected:
+  nsresult AddSubFolders(nsIMsgFolder *parent, nsCOMPtr<nsIFile> &path, bool deep);
+  nsresult CreateDirectoryForFolder(nsIFile *path);
+  nsresult GetOutputStream(nsIArray *aHdrArray,
+                           nsCOMPtr<nsIOutputStream> &outputStream,
+                           nsCOMPtr<nsISeekableStream> &seekableStream,
+                           int64_t &restorePos);
+  void GetMailboxModProperties(nsIMsgFolder *aFolder,
+                               int64_t *aSize, uint32_t *aDate);
+  void SetDBValid(nsIMsgDBHdr *aHdr);
+  // We don't want to keep re-opening an output stream when downloading
+  // multiple pop3 messages, or adjusting x-mozilla-status headers, so
+  // we cache output streams based on folder uri's. If the caller has closed
+  // the stream, we'll get a new one.
+  nsInterfaceHashtable<nsCStringHashKey, nsIOutputStream> m_outputStreams;
+
+#ifdef _DEBUG
+  nsCOMPtr<nsIMsgFolder> m_streamOutstandingFolder;
+#endif
+};
+
+#endif
diff --git a/mailnews/local/src/nsMsgLocalStoreUtils.cpp b/mailnews/local/src/nsMsgLocalStoreUtils.cpp
new file mode 100644
index 000000000..17d9b0f29
--- /dev/null
+++ b/mailnews/local/src/nsMsgLocalStoreUtils.cpp
@@ -0,0 +1,345 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+ 
+#include "msgCore.h"    // precompiled header...
+#include "nsMsgLocalStoreUtils.h"
+#include "nsIFile.h"
+#include "nsIDBFolderInfo.h"
+#include "nsIMsgDatabase.h"
+#include "prprf.h"
+
+#define EXTRA_SAFETY_SPACE 0x400000 // (4MiB)
+
+nsMsgLocalStoreUtils::nsMsgLocalStoreUtils()
+{
+}
+
+nsresult
+nsMsgLocalStoreUtils::AddDirectorySeparator(nsIFile *path)
+{
+  nsAutoString leafName;
+  path->GetLeafName(leafName);
+  leafName.AppendLiteral(FOLDER_SUFFIX);
+  return path->SetLeafName(leafName);
+}
+
+bool
+nsMsgLocalStoreUtils::nsShouldIgnoreFile(nsAString& name)
+{
+  char16_t firstChar = name.First();
+  if (firstChar == '.' || firstChar == '#' ||
+      name.CharAt(name.Length() - 1) == '~')
+    return true;
+
+  if (name.LowerCaseEqualsLiteral("msgfilterrules.dat") ||
+      name.LowerCaseEqualsLiteral("rules.dat") ||
+      name.LowerCaseEqualsLiteral("filterlog.html") ||
+      name.LowerCaseEqualsLiteral("junklog.html") ||
+      name.LowerCaseEqualsLiteral("rulesbackup.dat"))
+    return true;
+
+  // don't add summary files to the list of folders;
+  // don't add popstate files to the list either, or rules (sort.dat).
+  if (StringEndsWith(name, NS_LITERAL_STRING(".snm")) ||
+      name.LowerCaseEqualsLiteral("popstate.dat") ||
+      name.LowerCaseEqualsLiteral("sort.dat") ||
+      name.LowerCaseEqualsLiteral("mailfilt.log") ||
+      name.LowerCaseEqualsLiteral("filters.js") ||
+      StringEndsWith(name, NS_LITERAL_STRING(".toc")))
+    return true;
+
+  // ignore RSS data source files
+  if (name.LowerCaseEqualsLiteral("feeds.rdf") ||
+      name.LowerCaseEqualsLiteral("feeditems.rdf") ||
+      StringBeginsWith(name, NS_LITERAL_STRING("feeditems_error")))
+    return true;
+
+  // The .mozmsgs dir is for spotlight support
+    return (StringEndsWith(name, NS_LITERAL_STRING(".mozmsgs")) ||
+            StringEndsWith(name, NS_LITERAL_STRING(".sbd")) ||
+            StringEndsWith(name, NS_LITERAL_STRING(SUMMARY_SUFFIX)));
+}
+
+/**
+ * We're passed a stream positioned at the start of the message.
+ * We start reading lines, looking for x-mozilla-keys: headers; If we're
+ * adding the keyword and we find a header with the desired keyword already
+ * in it, we don't need to do anything. Likewise, if removing keyword and we
+ * don't find it,we don't need to do anything. Otherwise, if adding, we need
+ * to see if there's an x-mozilla-keys header with room for the new keyword.
+ *  If so, we replace the corresponding number of spaces with the keyword.
+ * If no room, we can't do anything until the folder is compacted and another
+ * x-mozilla-keys header is added. In that case, we set a property
+ * on the header, which the compaction code will check.
+ * This is not true for maildir, however, since it won't require compaction.
+ */
+
+void
+nsMsgLocalStoreUtils::ChangeKeywordsHelper(nsIMsgDBHdr *message,
+                                           uint64_t desiredOffset,
+                                           nsLineBuffer<char> *lineBuffer,
+                                           nsTArray<nsCString> &keywordArray,
+                                           bool aAdd,
+                                           nsIOutputStream *outputStream,
+                                           nsISeekableStream *seekableStream,
+                                           nsIInputStream *inputStream)
+{
+  uint32_t bytesWritten;
+
+  for (uint32_t i = 0; i < keywordArray.Length(); i++)
+  {
+    nsAutoCString header;
+    nsAutoCString keywords;
+    bool done = false;
+    uint32_t len = 0;
+    nsAutoCString keywordToWrite(" ");
+
+    keywordToWrite.Append(keywordArray[i]);
+    seekableStream->Seek(nsISeekableStream::NS_SEEK_SET, desiredOffset);
+    // need to reset lineBuffer, which is cheaper than creating a new one.
+    lineBuffer->start = lineBuffer->end = lineBuffer->buf;
+    bool inKeywordHeader = false;
+    bool foundKeyword = false;
+    int64_t offsetToAddKeyword = 0;
+    bool more;
+    message->GetMessageSize(&len);
+    // loop through
+    while (!done)
+    {
+      int64_t lineStartPos;
+      seekableStream->Tell(&lineStartPos);
+      // we need to adjust the linestart pos by how much extra the line
+      // buffer has read from the stream.
+      lineStartPos -= (lineBuffer->end - lineBuffer->start);
+      // NS_ReadLine doesn't return line termination chars.
+      nsCString keywordHeaders;
+      nsresult rv = NS_ReadLine(inputStream, lineBuffer, keywordHeaders, &more);
+      if (NS_SUCCEEDED(rv))
+      {
+        if (keywordHeaders.IsEmpty())
+          break; // passed headers; no x-mozilla-keywords header; give up.
+        if (StringBeginsWith(keywordHeaders,
+                             NS_LITERAL_CSTRING(HEADER_X_MOZILLA_KEYWORDS)))
+          inKeywordHeader = true;
+        else if (inKeywordHeader && (keywordHeaders.CharAt(0) == ' ' ||
+                                     keywordHeaders.CharAt(0) == '\t'))
+          ; // continuation header line
+        else if (inKeywordHeader)
+          break;
+        else
+          continue;
+        uint32_t keywordHdrLength = keywordHeaders.Length();
+        int32_t startOffset, keywordLength;
+        // check if we have the keyword
+        if (MsgFindKeyword(keywordArray[i], keywordHeaders, &startOffset,
+                           &keywordLength))
+        {
+          foundKeyword = true;
+          if (!aAdd) // if we're removing, remove it, and break;
+          {
+            keywordHeaders.Cut(startOffset, keywordLength);
+            for (int32_t j = keywordLength; j > 0; j--)
+              keywordHeaders.Append(' ');
+            seekableStream->Seek(nsISeekableStream::NS_SEEK_SET, lineStartPos);
+            outputStream->Write(keywordHeaders.get(), keywordHeaders.Length(),
+                                &bytesWritten);
+          }
+          offsetToAddKeyword = 0;
+          // if adding and we already have the keyword, done
+          done = true;
+          break;
+        }
+        // argh, we need to check all the lines to see if we already have the
+        // keyword, but if we don't find it, we want to remember the line and
+        // position where we have room to add the keyword.
+        if (aAdd)
+        {
+          nsAutoCString curKeywordHdr(keywordHeaders);
+          // strip off line ending spaces.
+          curKeywordHdr.Trim(" ", false, true);
+          if (!offsetToAddKeyword && curKeywordHdr.Length() +
+                keywordToWrite.Length() < keywordHdrLength)
+            offsetToAddKeyword = lineStartPos + curKeywordHdr.Length();
+        }
+      }
+    }
+    if (aAdd && !foundKeyword)
+    {
+      if (!offsetToAddKeyword)
+        message->SetUint32Property("growKeywords", 1);
+      else
+      {
+        seekableStream->Seek(nsISeekableStream::NS_SEEK_SET,
+                             offsetToAddKeyword);
+        outputStream->Write(keywordToWrite.get(), keywordToWrite.Length(),
+                            &bytesWritten);
+      }
+    }
+  }
+}
+
+nsresult
+nsMsgLocalStoreUtils::UpdateFolderFlag(nsIMsgDBHdr *mailHdr, bool bSet,
+                                       nsMsgMessageFlagType flag,
+                                       nsIOutputStream *fileStream)
+{
+  uint32_t statusOffset;
+  uint64_t msgOffset;
+  nsresult rv = mailHdr->GetStatusOffset(&statusOffset);
+  // This probably means there's no x-mozilla-status header, so
+  // we just ignore this.
+  if (NS_FAILED(rv) || (statusOffset == 0))
+    return NS_OK;
+  rv = mailHdr->GetMessageOffset(&msgOffset);
+  NS_ENSURE_SUCCESS(rv, rv);
+  uint64_t statusPos = msgOffset + statusOffset;
+  nsCOMPtr<nsISeekableStream> seekableStream(do_QueryInterface(fileStream, &rv));
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = seekableStream->Seek(nsISeekableStream::NS_SEEK_SET, statusPos);
+  NS_ENSURE_SUCCESS(rv, rv);
+  char buf[50];
+  buf[0] = '\0';
+  nsCOMPtr<nsIInputStream> inputStream = do_QueryInterface(fileStream, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+  uint32_t bytesRead;
+  if (NS_SUCCEEDED(inputStream->Read(buf, X_MOZILLA_STATUS_LEN + 6,
+                                     &bytesRead)))
+  {
+    buf[bytesRead] = '\0';
+    if (strncmp(buf, X_MOZILLA_STATUS, X_MOZILLA_STATUS_LEN) == 0 &&
+      strncmp(buf + X_MOZILLA_STATUS_LEN, ": ", 2) == 0 &&
+      strlen(buf) >= X_MOZILLA_STATUS_LEN + 6)
+    {
+      uint32_t flags;
+      uint32_t bytesWritten;
+      (void)mailHdr->GetFlags(&flags);
+      if (!(flags & nsMsgMessageFlags::Expunged))
+      {
+        char *p = buf + X_MOZILLA_STATUS_LEN + 2;
+
+        nsresult errorCode = NS_OK;
+        flags = nsDependentCString(p).ToInteger(&errorCode, 16);
+
+        uint32_t curFlags;
+        (void)mailHdr->GetFlags(&curFlags);
+        flags = (flags & nsMsgMessageFlags::Queued) |
+          (curFlags & ~nsMsgMessageFlags::RuntimeOnly);
+        if (bSet)
+          flags |= flag;
+        else
+          flags &= ~flag;
+      }
+      else
+      {
+        flags &= ~nsMsgMessageFlags::RuntimeOnly;
+      }
+      seekableStream->Seek(nsISeekableStream::NS_SEEK_SET, statusPos);
+      // We are filing out x-mozilla-status flags here
+      PR_snprintf(buf, sizeof(buf), X_MOZILLA_STATUS_FORMAT,
+        flags & 0x0000FFFF);
+      int32_t lineLen = PL_strlen(buf);
+      uint64_t status2Pos = statusPos + lineLen;
+      fileStream->Write(buf, lineLen, &bytesWritten);
+
+      if (flag & 0xFFFF0000)
+      {
+        // Time to update x-mozilla-status2,
+        // first find it by finding end of previous line, see bug 234935.
+        seekableStream->Seek(nsISeekableStream::NS_SEEK_SET, status2Pos);
+        do
+        {
+          rv = inputStream->Read(buf, 1, &bytesRead);
+          status2Pos++;
+        } while (NS_SUCCEEDED(rv) && (*buf == '\n' || *buf == '\r'));
+        status2Pos--;
+        seekableStream->Seek(nsISeekableStream::NS_SEEK_SET, status2Pos);
+        if (NS_SUCCEEDED(inputStream->Read(buf, X_MOZILLA_STATUS2_LEN + 10,
+                                           &bytesRead)))
+        {
+          if (strncmp(buf, X_MOZILLA_STATUS2, X_MOZILLA_STATUS2_LEN) == 0 &&
+            strncmp(buf + X_MOZILLA_STATUS2_LEN, ": ", 2) == 0 &&
+            strlen(buf) >= X_MOZILLA_STATUS2_LEN + 10)
+          {
+            uint32_t dbFlags;
+            (void)mailHdr->GetFlags(&dbFlags);
+            dbFlags &= 0xFFFF0000;
+            seekableStream->Seek(nsISeekableStream::NS_SEEK_SET, status2Pos);
+            PR_snprintf(buf, sizeof(buf), X_MOZILLA_STATUS2_FORMAT, dbFlags);
+            fileStream->Write(buf, PL_strlen(buf), &bytesWritten);
+          }
+        }
+      }
+    }
+    else
+    {
+#ifdef DEBUG
+      printf("Didn't find %s where expected at position %ld\n"
+        "instead, found %s.\n",
+        X_MOZILLA_STATUS, (long) statusPos, buf);
+#endif
+      rv = NS_ERROR_FAILURE;
+    }
+  }
+  else
+    rv = NS_ERROR_FAILURE;
+  return rv;
+}
+
+/**
+ * Returns true if there is enough space on disk.
+ *
+ * @param aFile  Any file in the message store that is on a logical
+ *               disk volume so that it can be queried for disk space.
+ * @param aSpaceRequested  The size of free space there must be on the disk
+ *                         to return true.
+ */
+bool
+nsMsgLocalStoreUtils::DiskSpaceAvailableInStore(nsIFile *aFile, uint64_t aSpaceRequested)
+{
+  int64_t diskFree;
+  nsresult rv = aFile->GetDiskSpaceAvailable(&diskFree);
+  if (NS_SUCCEEDED(rv)) {
+#ifdef DEBUG
+    printf("GetDiskSpaceAvailable returned: %lld bytes\n", (long long)diskFree);
+#endif
+    // When checking for disk space available, take into consideration
+    // possible database changes, therefore ask for a little more
+    // (EXTRA_SAFETY_SPACE) than what the requested size is. Also, due to disk
+    // sector sizes, allocation blocks, etc. The space "available" may be greater
+    // than the actual space usable.
+    return ((aSpaceRequested + EXTRA_SAFETY_SPACE) < (uint64_t) diskFree);
+  } else if (rv == NS_ERROR_NOT_IMPLEMENTED) {
+    // The call to GetDiskSpaceAvailable is not implemented!
+    // This will happen on certain platforms where GetDiskSpaceAvailable
+    // is not implemented. Since people on those platforms still need
+    // to download mail, we will simply bypass the disk-space check.
+    //
+    // We'll leave a debug message to warn people.
+#ifdef DEBUG
+    printf("Call to GetDiskSpaceAvailable FAILED because it is not implemented!\n");
+#endif
+    return true;
+  } else {
+    printf("Call to GetDiskSpaceAvailable FAILED!\n");
+    return false;
+  }
+}
+
+/**
+ * Resets forceReparse in the database.
+ *
+ * @param aMsgDb The database to reset.
+ */
+void
+nsMsgLocalStoreUtils::ResetForceReparse(nsIMsgDatabase *aMsgDB)
+{
+  if (aMsgDB)
+  {
+    nsCOMPtr<nsIDBFolderInfo> folderInfo;
+    aMsgDB->GetDBFolderInfo(getter_AddRefs(folderInfo));
+    if (folderInfo)
+      folderInfo->SetBooleanProperty("forceReparse", false);
+  }
+}
diff --git a/mailnews/local/src/nsMsgLocalStoreUtils.h b/mailnews/local/src/nsMsgLocalStoreUtils.h
new file mode 100644
index 000000000..182e0d15a
--- /dev/null
+++ b/mailnews/local/src/nsMsgLocalStoreUtils.h
@@ -0,0 +1,49 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+#ifndef nsMsgLocalStoreUtils_h__
+#define nsMsgLocalStoreUtils_h__
+
+#include "msgCore.h"
+#include "nsIMsgPluggableStore.h"
+#include "nsStringGlue.h"
+#include "nsReadLine.h"
+#include "nsISeekableStream.h"
+#include "nsIMsgHdr.h"
+#include "nsMsgLocalFolderHdrs.h"
+#include "nsMailHeaders.h"
+#include "nsMsgUtils.h"
+#include "nsIOutputStream.h"
+#include "nsMsgMessageFlags.h"
+
+/**
+ * Utility Class for handling local mail stores. Berkeley Mailbox
+ * and MailDir stores inherit from this class to share some code.
+*/
+
+class nsMsgLocalStoreUtils
+{
+public:
+  nsMsgLocalStoreUtils();
+
+  static nsresult AddDirectorySeparator(nsIFile *path);
+  static bool nsShouldIgnoreFile(nsAString& name);
+  static void ChangeKeywordsHelper(nsIMsgDBHdr *message,
+                            uint64_t desiredOffset,
+                            nsLineBuffer<char> *lineBuffer,
+                            nsTArray<nsCString> &keywordArray,
+                            bool aAdd,
+                            nsIOutputStream *outputStream,
+                            nsISeekableStream *seekableStream,
+                            nsIInputStream *inputStream);
+  static void ResetForceReparse(nsIMsgDatabase *aMsgDB);
+
+  nsresult UpdateFolderFlag(nsIMsgDBHdr *mailHdr, bool bSet,
+                            nsMsgMessageFlagType flag,
+                            nsIOutputStream *fileStream);
+  bool DiskSpaceAvailableInStore(nsIFile *aFile,
+                                 uint64_t aSpaceRequested);
+};
+
+#endif
diff --git a/mailnews/local/src/nsMsgMaildirStore.cpp b/mailnews/local/src/nsMsgMaildirStore.cpp
new file mode 100644
index 000000000..7a4633367
--- /dev/null
+++ b/mailnews/local/src/nsMsgMaildirStore.cpp
@@ -0,0 +1,1453 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+   Class for handling Maildir stores.
+*/
+
+#include "prprf.h"
+#include "mozilla/Logging.h"
+#include "msgCore.h"
+#include "nsMsgMaildirStore.h"
+#include "nsIMsgFolder.h"
+#include "nsISimpleEnumerator.h"
+#include "nsMsgFolderFlags.h"
+#include "nsILocalMailIncomingServer.h"
+#include "nsCOMArray.h"
+#include "nsIFile.h"
+#include "nsNetUtil.h"
+#include "nsIMsgDatabase.h"
+#include "nsNativeCharsetUtils.h"
+#include "nsMsgUtils.h"
+#include "nsMsgDBCID.h"
+#include "nsIDBFolderInfo.h"
+#include "nsIMutableArray.h"
+#include "nsArrayUtils.h"
+#include "nsMailHeaders.h"
+#include "nsParseMailbox.h"
+#include "nsIMailboxService.h"
+#include "nsMsgLocalCID.h"
+#include "nsIMsgLocalMailFolder.h"
+#include "nsITimer.h"
+#include "nsIMailboxUrl.h"
+#include "nsIMsgMailNewsUrl.h"
+#include "nsIMsgFilterPlugin.h"
+#include "nsLocalUndoTxn.h"
+#include "nsIMessenger.h"
+
+static PRLogModuleInfo* MailDirLog;
+
+nsMsgMaildirStore::nsMsgMaildirStore()
+{
+  MailDirLog = PR_NewLogModule("MailDirStore");
+}
+
+nsMsgMaildirStore::~nsMsgMaildirStore()
+{
+}
+
+NS_IMPL_ISUPPORTS(nsMsgMaildirStore, nsIMsgPluggableStore)
+
+// Iterates over the folders in the "path" directory, and adds subfolders to
+// parent for each Maildir folder found.
+nsresult nsMsgMaildirStore::AddSubFolders(nsIMsgFolder *parent, nsIFile *path,
+                                          bool deep)
+{
+  nsCOMArray<nsIFile> currentDirEntries;
+
+  nsCOMPtr<nsISimpleEnumerator> directoryEnumerator;
+  nsresult rv = path->GetDirectoryEntries(getter_AddRefs(directoryEnumerator));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  bool hasMore;
+  while (NS_SUCCEEDED(directoryEnumerator->HasMoreElements(&hasMore)) &&
+         hasMore)
+  {
+    nsCOMPtr<nsISupports> aSupport;
+    directoryEnumerator->GetNext(getter_AddRefs(aSupport));
+    nsCOMPtr<nsIFile> currentFile(do_QueryInterface(aSupport, &rv));
+    if (currentFile) {
+      nsAutoString leafName;
+      currentFile->GetLeafName(leafName);
+      bool isDirectory = false;
+      currentFile->IsDirectory(&isDirectory);
+      // Make sure this really is a mail folder dir (i.e., a directory that
+      // contains cur and tmp sub-dirs, and not a .sbd or .mozmsgs dir).
+      if (isDirectory && !nsShouldIgnoreFile(leafName))
+        currentDirEntries.AppendObject(currentFile);
+    }
+  }
+
+  // add the folders
+  int32_t count = currentDirEntries.Count();
+  for (int32_t i = 0; i < count; ++i)
+  {
+    nsCOMPtr<nsIFile> currentFile(currentDirEntries[i]);
+
+    nsAutoString leafName;
+    currentFile->GetLeafName(leafName);
+
+    nsCOMPtr<nsIMsgFolder> child;
+    rv = parent->AddSubfolder(leafName, getter_AddRefs(child));
+    if (child)
+    {
+      nsString folderName;
+      child->GetName(folderName);  // try to get it from cache/db
+      if (folderName.IsEmpty())
+        child->SetPrettyName(leafName);
+      if (deep)
+      {
+        nsCOMPtr<nsIFile> path;
+        rv = child->GetFilePath(getter_AddRefs(path));
+        NS_ENSURE_SUCCESS(rv, rv);
+
+        // Construct the .sbd directory path for the possible children of the
+        // folder.
+        GetDirectoryForFolder(path);
+        bool directory = false;
+        // Check that <folder>.sbd really is a directory.
+        path->IsDirectory(&directory);
+        if (directory)
+          AddSubFolders(child, path, true);
+      }
+    }
+  }
+  return rv == NS_MSG_FOLDER_EXISTS ? NS_OK : rv;
+}
+
+NS_IMETHODIMP nsMsgMaildirStore::DiscoverSubFolders(nsIMsgFolder *aParentFolder,
+                                                    bool aDeep)
+{
+  NS_ENSURE_ARG_POINTER(aParentFolder);
+
+  nsCOMPtr<nsIFile> path;
+  nsresult rv = aParentFolder->GetFilePath(getter_AddRefs(path));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  bool isServer, directory = false;
+  aParentFolder->GetIsServer(&isServer);
+  if (!isServer)
+    GetDirectoryForFolder(path);
+
+  path->IsDirectory(&directory);
+  if (directory)
+    rv = AddSubFolders(aParentFolder, path, aDeep);
+
+  return (rv == NS_MSG_FOLDER_EXISTS) ? NS_OK : rv;
+}
+
+/**
+ * Create if missing a Maildir-style folder with "tmp" and "cur" subfolders
+ * but no "new" subfolder, because it doesn't make sense in the mail client
+ * context. ("new" directory is for messages on the server that haven't been
+*  seen by a mail client).
+ * aFolderName is already "safe" - it has been through NS_MsgHashIfNecessary.
+ */
+nsresult nsMsgMaildirStore::CreateMaildir(nsIFile *path)
+{
+  nsresult rv = path->Create(nsIFile::DIRECTORY_TYPE, 0700);
+  if (NS_FAILED(rv) && rv != NS_ERROR_FILE_ALREADY_EXISTS)
+  {
+    NS_WARNING("Could not create root directory for message folder");
+    return rv;
+  }
+
+  // Create tmp, cur leaves
+  nsCOMPtr<nsIFile> leaf(do_CreateInstance(NS_LOCAL_FILE_CONTRACTID, &rv));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  leaf->InitWithFile(path);
+
+  leaf->AppendNative(NS_LITERAL_CSTRING("tmp"));
+  rv = leaf->Create(nsIFile::DIRECTORY_TYPE, 0700);
+  if (NS_FAILED(rv) && rv != NS_ERROR_FILE_ALREADY_EXISTS)
+  {
+    NS_WARNING("Could not create tmp directory for message folder");
+    return rv;
+  }
+
+  leaf->SetNativeLeafName(NS_LITERAL_CSTRING("cur"));
+  rv = leaf->Create(nsIFile::DIRECTORY_TYPE, 0700);
+  if (NS_FAILED(rv) && rv != NS_ERROR_FILE_ALREADY_EXISTS)
+  {
+    NS_WARNING("Could not create cur directory for message folder");
+    return rv;
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsMsgMaildirStore::CreateFolder(nsIMsgFolder *aParent,
+                                              const nsAString &aFolderName,
+                                              nsIMsgFolder **aResult)
+{
+  NS_ENSURE_ARG_POINTER(aParent);
+  NS_ENSURE_ARG_POINTER(aResult);
+  if (aFolderName.IsEmpty())
+    return NS_MSG_ERROR_INVALID_FOLDER_NAME;
+
+  nsCOMPtr <nsIFile> path;
+  nsresult rv = aParent->GetFilePath(getter_AddRefs(path));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // Get a directory based on our current path
+  bool isServer;
+  aParent->GetIsServer(&isServer);
+  rv = CreateDirectoryForFolder(path, isServer);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // Make sure the new folder name is valid
+  nsAutoString safeFolderName(aFolderName);
+  NS_MsgHashIfNecessary(safeFolderName);
+
+  path->Append(safeFolderName);
+  bool exists;
+  path->Exists(&exists);
+  if (exists) //check this because localized names are different from disk names
+    return NS_MSG_FOLDER_EXISTS;
+
+  rv = CreateMaildir(path);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsIMsgFolder> child;
+  // GetFlags and SetFlags in AddSubfolder will fail because we have no db at
+  // this point but mFlags is set.
+  rv = aParent->AddSubfolder(safeFolderName, getter_AddRefs(child));
+  if (!child || NS_FAILED(rv))
+  {
+    path->Remove(true); // recursive
+    return rv;
+  }
+
+  // Create an empty database for this mail folder, set its name from the user
+  nsCOMPtr<nsIMsgDBService> msgDBService =
+    do_GetService(NS_MSGDB_SERVICE_CONTRACTID, &rv);
+  if (msgDBService)
+  {
+    nsCOMPtr<nsIMsgDatabase> unusedDB;
+    rv = msgDBService->OpenFolderDB(child, true, getter_AddRefs(unusedDB));
+    if (rv == NS_MSG_ERROR_FOLDER_SUMMARY_MISSING)
+      rv = msgDBService->CreateNewDB(child, getter_AddRefs(unusedDB));
+
+    if ((NS_SUCCEEDED(rv) || rv == NS_MSG_ERROR_FOLDER_SUMMARY_OUT_OF_DATE) &&
+        unusedDB)
+    {
+      //need to set the folder name
+      nsCOMPtr<nsIDBFolderInfo> folderInfo;
+      rv = unusedDB->GetDBFolderInfo(getter_AddRefs(folderInfo));
+      if (NS_SUCCEEDED(rv))
+        folderInfo->SetMailboxName(safeFolderName);
+
+      unusedDB->SetSummaryValid(true);
+      unusedDB->Close(true);
+      aParent->UpdateSummaryTotals(true);
+    }
+    else
+    {
+      MOZ_LOG(MailDirLog, mozilla::LogLevel::Info,
+            ("CreateFolder - failed creating db for new folder\n"));
+      path->Remove(true); // recursive
+      rv = NS_MSG_CANT_CREATE_FOLDER;
+    }
+  }
+  child.swap(*aResult);
+  return rv;
+}
+
+NS_IMETHODIMP nsMsgMaildirStore::HasSpaceAvailable(nsIMsgFolder *aFolder,
+                                                   int64_t aSpaceRequested,
+                                                   bool *aResult)
+{
+  NS_ENSURE_ARG_POINTER(aResult);
+  NS_ENSURE_ARG_POINTER(aFolder);
+
+  nsCOMPtr<nsIFile> pathFile;
+  nsresult rv = aFolder->GetFilePath(getter_AddRefs(pathFile));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  *aResult = DiskSpaceAvailableInStore(pathFile, aSpaceRequested);
+  if (!*aResult)
+    return NS_ERROR_FILE_DISK_FULL;
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsMsgMaildirStore::IsSummaryFileValid(nsIMsgFolder *aFolder,
+                                                    nsIMsgDatabase *aDB,
+                                                    bool *aResult)
+{
+  NS_ENSURE_ARG_POINTER(aFolder);
+  NS_ENSURE_ARG_POINTER(aDB);
+  NS_ENSURE_ARG_POINTER(aResult);
+  *aResult = true;
+  nsCOMPtr<nsIDBFolderInfo> dbFolderInfo;
+  aDB->GetDBFolderInfo(getter_AddRefs(dbFolderInfo));
+  nsresult rv = dbFolderInfo->GetBooleanProperty("maildirValid", false,
+                                                 aResult);
+  if (!*aResult)
+  {
+    nsCOMPtr<nsIFile> newFile;
+    rv = aFolder->GetFilePath(getter_AddRefs(newFile));
+    NS_ENSURE_SUCCESS(rv, rv);
+    newFile->Append(NS_LITERAL_STRING("cur"));
+
+    // If the "cur" sub-dir doesn't exist, and there are no messages
+    // in the db, then the folder is probably new and the db is valid.
+    bool exists;
+    newFile->Exists(&exists);
+    if (!exists)
+    {
+      int32_t numMessages;
+      dbFolderInfo->GetNumMessages(&numMessages);
+      if (!numMessages)
+        *aResult = true;
+    }
+  }
+  return rv;
+}
+
+NS_IMETHODIMP nsMsgMaildirStore::SetSummaryFileValid(nsIMsgFolder *aFolder,
+                                                     nsIMsgDatabase *aDB,
+                                                     bool aValid)
+{
+  NS_ENSURE_ARG_POINTER(aFolder);
+  NS_ENSURE_ARG_POINTER(aDB);
+  nsCOMPtr<nsIDBFolderInfo> dbFolderInfo;
+  aDB->GetDBFolderInfo(getter_AddRefs(dbFolderInfo));
+  NS_ENSURE_STATE(dbFolderInfo);
+  return dbFolderInfo->SetBooleanProperty("maildirValid", aValid);
+}
+
+NS_IMETHODIMP nsMsgMaildirStore::DeleteFolder(nsIMsgFolder *aFolder)
+{
+  NS_ENSURE_ARG_POINTER(aFolder);
+
+  // Delete Maildir structure
+  nsCOMPtr<nsIFile> pathFile;
+  nsresult rv = aFolder->GetFilePath(getter_AddRefs(pathFile));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = pathFile->Remove(true); // recursive
+  AddDirectorySeparator(pathFile);
+  bool exists;
+  pathFile->Exists(&exists);
+  if (exists)
+    pathFile->Remove(true);
+  return rv;
+}
+
+NS_IMETHODIMP nsMsgMaildirStore::RenameFolder(nsIMsgFolder *aFolder,
+                                              const nsAString & aNewName,
+                                              nsIMsgFolder **aNewFolder)
+{
+  NS_ENSURE_ARG_POINTER(aFolder);
+  NS_ENSURE_ARG_POINTER(aNewFolder);
+
+  // old path
+  nsCOMPtr<nsIFile> oldPathFile;
+  nsresult rv = aFolder->GetFilePath(getter_AddRefs(oldPathFile));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // old sbd directory
+  nsCOMPtr<nsIFile> sbdPathFile;
+  uint32_t numChildren;
+  aFolder->GetNumSubFolders(&numChildren);
+  if (numChildren > 0)
+  {
+    sbdPathFile = do_CreateInstance(NS_LOCAL_FILE_CONTRACTID, &rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+    rv = sbdPathFile->InitWithFile(oldPathFile);
+    NS_ENSURE_SUCCESS(rv, rv);
+    GetDirectoryForFolder(sbdPathFile);
+  }
+
+  // old summary
+  nsCOMPtr<nsIFile> oldSummaryFile;
+  rv = aFolder->GetSummaryFile(getter_AddRefs(oldSummaryFile));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // Validate new name
+  nsAutoString safeName(aNewName);
+  NS_MsgHashIfNecessary(safeName);
+
+  aFolder->ForceDBClosed();
+
+  // rename folder
+  rv = oldPathFile->MoveTo(nullptr, safeName);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  if (numChildren > 0)
+  {
+    // rename "*.sbd" directory
+    nsAutoString sbdName = safeName;
+    sbdName += NS_LITERAL_STRING(FOLDER_SUFFIX);
+    sbdPathFile->MoveTo(nullptr, sbdName);
+  }
+
+  // rename summary
+  nsAutoString summaryName(safeName);
+  summaryName += NS_LITERAL_STRING(SUMMARY_SUFFIX);
+  oldSummaryFile->MoveTo(nullptr, summaryName);
+
+  nsCOMPtr<nsIMsgFolder> parentFolder;
+  rv = aFolder->GetParent(getter_AddRefs(parentFolder));
+  if (!parentFolder)
+    return NS_ERROR_NULL_POINTER;
+
+  return parentFolder->AddSubfolder(safeName, aNewFolder);
+}
+
+NS_IMETHODIMP nsMsgMaildirStore::CopyFolder(nsIMsgFolder *aSrcFolder,
+                                            nsIMsgFolder *aDstFolder,
+                                            bool aIsMoveFolder,
+                                            nsIMsgWindow *aMsgWindow,
+                                            nsIMsgCopyServiceListener *aListener,
+                                            const nsAString &aNewName)
+{
+  NS_ENSURE_ARG_POINTER(aSrcFolder);
+  NS_ENSURE_ARG_POINTER(aDstFolder);
+
+  nsAutoString folderName;
+  if (aNewName.IsEmpty())
+    aSrcFolder->GetName(folderName);
+  else
+    folderName.Assign(aNewName);
+
+  nsAutoString safeFolderName(folderName);
+  NS_MsgHashIfNecessary(safeFolderName);
+  nsCOMPtr<nsIMsgLocalMailFolder> localSrcFolder(do_QueryInterface(aSrcFolder));
+  aSrcFolder->ForceDBClosed();
+
+  nsCOMPtr<nsIFile> oldPath;
+  nsresult rv = aSrcFolder->GetFilePath(getter_AddRefs(oldPath));
+  NS_ENSURE_SUCCESS(rv,rv);
+
+  nsCOMPtr<nsIFile> summaryFile;
+  GetSummaryFileLocation(oldPath, getter_AddRefs(summaryFile));
+
+  nsCOMPtr<nsIFile> newPath;
+  rv = aDstFolder->GetFilePath(getter_AddRefs(newPath));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // create target directory based on our current path
+  bool isServer;
+  aDstFolder->GetIsServer(&isServer);
+  rv = CreateDirectoryForFolder(newPath, isServer);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsIFile> origPath;
+  oldPath->Clone(getter_AddRefs(origPath));
+
+  rv = oldPath->CopyTo(newPath, safeFolderName);
+  NS_ENSURE_SUCCESS(rv, rv); //will fail if a file by that name exists
+
+  // Copy to dir can fail if file does not exist. If copy fails, we test
+  // if the file exists or not, if it does not that's ok, we continue
+  // without copying it. If it fails and file exist and is not zero sized
+  // there is real problem.
+  nsAutoString dbName(safeFolderName);
+  dbName += NS_LITERAL_STRING(SUMMARY_SUFFIX);
+  rv = summaryFile->CopyTo(newPath, dbName);
+  if (!NS_SUCCEEDED(rv))
+  {
+    // Test if the file is not empty
+    bool exists;
+    int64_t fileSize;
+    summaryFile->Exists(&exists);
+    summaryFile->GetFileSize(&fileSize);
+    if (exists && fileSize > 0)
+      NS_ENSURE_SUCCESS(rv, rv); // Yes, it should have worked!
+    // else case is file is zero sized, no need to copy it,
+    // not an error
+    // else case is file does not exist - not an error
+  }
+
+  nsCOMPtr<nsIMsgFolder> newMsgFolder;
+  rv = aDstFolder->AddSubfolder(safeFolderName, getter_AddRefs(newMsgFolder));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  newMsgFolder->SetPrettyName(folderName);
+  uint32_t flags;
+  aSrcFolder->GetFlags(&flags);
+  newMsgFolder->SetFlags(flags);
+  bool changed = false;
+  rv = aSrcFolder->MatchOrChangeFilterDestination(newMsgFolder, true, &changed);
+  if (changed)
+    aSrcFolder->AlertFilterChanged(aMsgWindow);
+
+  nsCOMPtr<nsISimpleEnumerator> enumerator;
+  rv = aSrcFolder->GetSubFolders(getter_AddRefs(enumerator));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // Copy subfolders to the new location
+  nsresult copyStatus = NS_OK;
+  nsCOMPtr<nsIMsgLocalMailFolder> localNewFolder(do_QueryInterface(newMsgFolder, &rv));
+  if (NS_SUCCEEDED(rv))
+  {
+    bool hasMore;
+    while (NS_SUCCEEDED(enumerator->HasMoreElements(&hasMore)) && hasMore &&
+           NS_SUCCEEDED(copyStatus))
+    {
+      nsCOMPtr<nsISupports> item;
+      enumerator->GetNext(getter_AddRefs(item));
+
+      nsCOMPtr<nsIMsgFolder> folder(do_QueryInterface(item));
+      if (!folder)
+        continue;
+
+      copyStatus = localNewFolder->CopyFolderLocal(folder, false, aMsgWindow,
+                                                   aListener);
+      // Test if the call succeeded, if not we have to stop recursive call
+      if (NS_FAILED(copyStatus))
+      {
+        // Copy failed we have to notify caller to handle the error and stop
+        // moving the folders. In case this happens to the topmost level of
+        // recursive call, then we just need to break from the while loop and
+        // go to error handling code.
+        if (!aIsMoveFolder)
+          return copyStatus;
+        break;
+      }
+    }
+  }
+
+  if (aIsMoveFolder && NS_SUCCEEDED(copyStatus))
+  {
+    if (localNewFolder)
+    {
+      nsCOMPtr<nsISupports> srcSupport(do_QueryInterface(aSrcFolder));
+      localNewFolder->OnCopyCompleted(srcSupport, true);
+    }
+
+    // Notify that the folder that was dragged and dropped has been created.
+    // No need to do this for its subfolders - isMoveFolder will be true for folder.
+    aDstFolder->NotifyItemAdded(newMsgFolder);
+
+    nsCOMPtr<nsIMsgFolder> msgParent;
+    aSrcFolder->GetParent(getter_AddRefs(msgParent));
+    aSrcFolder->SetParent(nullptr);
+    if (msgParent)
+    {
+      // The files have already been moved, so delete storage false
+      msgParent->PropagateDelete(aSrcFolder, false, aMsgWindow);
+      oldPath->Remove(true);
+      nsCOMPtr<nsIMsgDatabase> srcDB; // we need to force closed the source db
+      aSrcFolder->Delete();
+
+      nsCOMPtr<nsIFile> parentPath;
+      rv = msgParent->GetFilePath(getter_AddRefs(parentPath));
+      NS_ENSURE_SUCCESS(rv,rv);
+
+      AddDirectorySeparator(parentPath);
+      nsCOMPtr<nsISimpleEnumerator> children;
+      parentPath->GetDirectoryEntries(getter_AddRefs(children));
+      bool more;
+      // checks if the directory is empty or not
+      if (children && NS_SUCCEEDED(children->HasMoreElements(&more)) && !more)
+        parentPath->Remove(true);
+    }
+  }
+  else
+  {
+    // This is the case where the copy of a subfolder failed.
+    // We have to delete the newDirectory tree to make a "rollback".
+    // Someone should add a popup to warn the user that the move was not
+    // possible.
+    if (aIsMoveFolder && NS_FAILED(copyStatus))
+    {
+      nsCOMPtr<nsIMsgFolder> msgParent;
+      newMsgFolder->ForceDBClosed();
+      newMsgFolder->GetParent(getter_AddRefs(msgParent));
+      newMsgFolder->SetParent(nullptr);
+      if (msgParent)
+      {
+        msgParent->PropagateDelete(newMsgFolder, false, aMsgWindow);
+        newMsgFolder->Delete();
+        newMsgFolder->ForceDBClosed();
+        AddDirectorySeparator(newPath);
+        newPath->Remove(true); //berkeley mailbox
+      }
+      return NS_ERROR_FAILURE;
+    }
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsMsgMaildirStore::GetNewMsgOutputStream(nsIMsgFolder *aFolder,
+                                         nsIMsgDBHdr **aNewMsgHdr,
+                                         bool *aReusable,
+                                         nsIOutputStream **aResult)
+{
+  NS_ENSURE_ARG_POINTER(aFolder);
+  NS_ENSURE_ARG_POINTER(aNewMsgHdr);
+  NS_ENSURE_ARG_POINTER(aReusable);
+  NS_ENSURE_ARG_POINTER(aResult);
+
+  *aReusable = false; // message per file
+
+  nsCOMPtr<nsIMsgDatabase> db;
+  aFolder->GetMsgDatabase(getter_AddRefs(db));
+  if (!db)
+    NS_ERROR("no db");
+
+  nsresult rv;
+
+  if (!*aNewMsgHdr)
+  {
+    rv = db->CreateNewHdr(nsMsgKey_None, aNewMsgHdr);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+  }
+  (*aNewMsgHdr)->SetMessageOffset(0);
+  // path to the message download folder
+  nsCOMPtr<nsIFile> newFile;
+  rv = aFolder->GetFilePath(getter_AddRefs(newFile));
+  NS_ENSURE_SUCCESS(rv, rv);
+  newFile->Append(NS_LITERAL_STRING("tmp"));
+
+  // let's check if the folder exists
+  bool exists;
+  newFile->Exists(&exists);
+  if (!exists) {
+    MOZ_LOG(MailDirLog, mozilla::LogLevel::Info,
+           ("GetNewMsgOutputStream - tmp subfolder does not exist!!\n"));
+    rv = newFile->Create(nsIFile::DIRECTORY_TYPE, 0755);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  // generate new file name
+  nsAutoCString newName;
+  newName.AppendInt(static_cast<int64_t>(PR_Now()));
+  newFile->AppendNative(newName);
+  // CreateUnique, in case we get more than one message per millisecond :-)
+  rv = newFile->CreateUnique(nsIFile::NORMAL_FILE_TYPE, 0600);
+  NS_ENSURE_SUCCESS(rv, rv);
+  newFile->GetNativeLeafName(newName);
+  // save the file name in the message header - otherwise no way to retrieve it
+  (*aNewMsgHdr)->SetStringProperty("storeToken", newName.get());
+  return MsgNewBufferedFileOutputStream(aResult, newFile,
+                                        PR_WRONLY | PR_CREATE_FILE, 00600);
+}
+
+NS_IMETHODIMP
+nsMsgMaildirStore::DiscardNewMessage(nsIOutputStream *aOutputStream,
+                                     nsIMsgDBHdr *aNewHdr)
+{
+  NS_ENSURE_ARG_POINTER(aOutputStream);
+  NS_ENSURE_ARG_POINTER(aNewHdr);
+
+  aOutputStream->Close();
+  // file path is stored in message header property "storeToken"
+  nsAutoCString fileName;
+  aNewHdr->GetStringProperty("storeToken", getter_Copies(fileName));
+  if (fileName.IsEmpty())
+    return NS_ERROR_FAILURE;
+
+  nsCOMPtr<nsIFile> path;
+  nsCOMPtr<nsIMsgFolder> folder;
+  nsresult rv = aNewHdr->GetFolder(getter_AddRefs(folder));
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = folder->GetFilePath(getter_AddRefs(path));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // path to the message download folder
+  path->Append(NS_LITERAL_STRING("tmp"));
+  path->AppendNative(fileName);
+
+  return path->Remove(false);
+}
+
+NS_IMETHODIMP
+nsMsgMaildirStore::FinishNewMessage(nsIOutputStream *aOutputStream,
+                                    nsIMsgDBHdr *aNewHdr)
+{
+  NS_ENSURE_ARG_POINTER(aOutputStream);
+  NS_ENSURE_ARG_POINTER(aNewHdr);
+
+  aOutputStream->Close();
+
+  nsCOMPtr<nsIFile> folderPath;
+  nsCOMPtr<nsIMsgFolder> folder;
+  nsresult rv = aNewHdr->GetFolder(getter_AddRefs(folder));
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = folder->GetFilePath(getter_AddRefs(folderPath));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // file path is stored in message header property
+  nsAutoCString fileName;
+  aNewHdr->GetStringProperty("storeToken", getter_Copies(fileName));
+  if (fileName.IsEmpty())
+  {
+    NS_ERROR("FinishNewMessage - no storeToken in msg hdr!!\n");
+    return NS_ERROR_FAILURE;
+  }
+
+  // path to the new destination
+  nsCOMPtr<nsIFile> toPath;
+  folderPath->Clone(getter_AddRefs(toPath));
+  toPath->Append(NS_LITERAL_STRING("cur"));
+
+  // let's check if the folder exists
+  bool exists;
+  toPath->Exists(&exists);
+  if (!exists)
+  {
+    rv = toPath->Create(nsIFile::DIRECTORY_TYPE, 0755);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  // path to the downloaded message
+  nsCOMPtr<nsIFile> fromPath;
+  folderPath->Clone(getter_AddRefs(fromPath));
+  fromPath->Append(NS_LITERAL_STRING("tmp"));
+  fromPath->AppendNative(fileName);
+
+  // let's check if the tmp file exists
+  fromPath->Exists(&exists);
+  if (!exists)
+  {
+    // Perhaps the message has already moved. See bug 1028372 to fix this.
+    toPath->AppendNative(fileName);
+    toPath->Exists(&exists);
+    if (exists) // then there is nothing to do
+      return NS_OK;
+
+    NS_ERROR("FinishNewMessage - oops! file does not exist!");
+    return NS_ERROR_FILE_TARGET_DOES_NOT_EXIST;
+  }
+
+  nsCOMPtr<nsIFile> existingPath;
+  toPath->Clone(getter_AddRefs(existingPath));
+  existingPath->AppendNative(fileName);
+  existingPath->Exists(&exists);
+
+  if (exists) {
+    rv = existingPath->CreateUnique(nsIFile::NORMAL_FILE_TYPE, 0600);
+    NS_ENSURE_SUCCESS(rv, rv);
+    existingPath->GetNativeLeafName(fileName);
+    aNewHdr->SetStringProperty("storeToken", fileName.get());
+  }
+
+  return fromPath->MoveToNative(toPath, fileName);
+}
+
+NS_IMETHODIMP
+nsMsgMaildirStore::MoveNewlyDownloadedMessage(nsIMsgDBHdr *aHdr,
+                                              nsIMsgFolder *aDestFolder,
+                                              bool *aResult)
+{
+  NS_ENSURE_ARG_POINTER(aHdr);
+  NS_ENSURE_ARG_POINTER(aDestFolder);
+  NS_ENSURE_ARG_POINTER(aResult);
+
+  nsCOMPtr<nsIFile> folderPath;
+  nsCOMPtr<nsIMsgFolder> folder;
+  nsresult rv = aHdr->GetFolder(getter_AddRefs(folder));
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = folder->GetFilePath(getter_AddRefs(folderPath));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // file path is stored in message header property
+  nsAutoCString fileName;
+  aHdr->GetStringProperty("storeToken", getter_Copies(fileName));
+  if (fileName.IsEmpty())
+  {
+    NS_ERROR("FinishNewMessage - no storeToken in msg hdr!!\n");
+    return NS_ERROR_FAILURE;
+  }
+
+  // path to the downloaded message
+  nsCOMPtr<nsIFile> fromPath;
+  folderPath->Clone(getter_AddRefs(fromPath));
+  fromPath->Append(NS_LITERAL_STRING("cur"));
+  fromPath->AppendNative(fileName);
+
+  // let's check if the tmp file exists
+  bool exists;
+  fromPath->Exists(&exists);
+  if (!exists)
+  {
+    NS_ERROR("FinishNewMessage - oops! file does not exist!");
+    return NS_ERROR_FAILURE;
+  }
+
+  // move to the "cur" subfolder
+  nsCOMPtr<nsIFile> toPath;
+  aDestFolder->GetFilePath(getter_AddRefs(folderPath));
+  folderPath->Clone(getter_AddRefs(toPath));
+  toPath->Append(NS_LITERAL_STRING("cur"));
+
+  // let's check if the folder exists
+  toPath->Exists(&exists);
+  if (!exists)
+  {
+    rv = toPath->Create(nsIFile::DIRECTORY_TYPE, 0755);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  nsCOMPtr<nsIMsgDatabase> destMailDB;
+  rv = aDestFolder->GetMsgDatabase(getter_AddRefs(destMailDB));
+  NS_WARNING_ASSERTION(destMailDB && NS_SUCCEEDED(rv),
+                       "failed to open mail db moving message");
+
+  nsCOMPtr<nsIMsgDBHdr> newHdr;
+  if (destMailDB)
+    rv = destMailDB->CopyHdrFromExistingHdr(nsMsgKey_None, aHdr, true,
+                                            getter_AddRefs(newHdr));
+  if (NS_SUCCEEDED(rv) && !newHdr)
+    rv = NS_ERROR_UNEXPECTED;
+
+  if (NS_FAILED(rv)) {
+    aDestFolder->ThrowAlertMsg("filterFolderHdrAddFailed", nullptr);
+    return rv;
+  }
+
+  nsCOMPtr<nsIFile> existingPath;
+  toPath->Clone(getter_AddRefs(existingPath));
+  existingPath->AppendNative(fileName);
+  existingPath->Exists(&exists);
+
+  if (exists) {
+    rv = existingPath->CreateUnique(nsIFile::NORMAL_FILE_TYPE, 0600);
+    NS_ENSURE_SUCCESS(rv, rv);
+    existingPath->GetNativeLeafName(fileName);
+    newHdr->SetStringProperty("storeToken", fileName.get());
+  }
+
+  rv = fromPath->MoveToNative(toPath, fileName);
+  *aResult = NS_SUCCEEDED(rv);
+  if (NS_FAILED(rv))
+    aDestFolder->ThrowAlertMsg("filterFolderWriteFailed", nullptr);
+
+  if (NS_FAILED(rv)) {
+    if (destMailDB)
+      destMailDB->Close(true);
+
+    return NS_MSG_ERROR_WRITING_MAIL_FOLDER;
+  }
+
+  bool movedMsgIsNew = false;
+  // if we have made it this far then the message has successfully been
+  // written to the new folder now add the header to the destMailDB.
+
+  uint32_t newFlags;
+  newHdr->GetFlags(&newFlags);
+  nsMsgKey msgKey;
+  newHdr->GetMessageKey(&msgKey);
+  if (!(newFlags & nsMsgMessageFlags::Read))
+  {
+    nsCString junkScoreStr;
+    (void) newHdr->GetStringProperty("junkscore", getter_Copies(junkScoreStr));
+    if (atoi(junkScoreStr.get()) != nsIJunkMailPlugin::IS_SPAM_SCORE) {
+      newHdr->OrFlags(nsMsgMessageFlags::New, &newFlags);
+      destMailDB->AddToNewList(msgKey);
+      movedMsgIsNew = true;
+    }
+  }
+
+  nsCOMPtr<nsIMsgFolderNotificationService> notifier(
+    do_GetService(NS_MSGNOTIFICATIONSERVICE_CONTRACTID));
+  if (notifier)
+    notifier->NotifyMsgAdded(newHdr);
+
+  if (movedMsgIsNew) {
+    aDestFolder->SetHasNewMessages(true);
+
+    // Notify the message was moved.
+    if (notifier) {
+      notifier->NotifyItemEvent(folder,
+                                NS_LITERAL_CSTRING("UnincorporatedMessageMoved"),
+                                newHdr);
+    }
+  }
+
+  nsCOMPtr<nsIMsgDatabase> sourceDB;
+  rv = folder->GetMsgDatabase(getter_AddRefs(sourceDB));
+
+  if (NS_SUCCEEDED(rv) && sourceDB)
+    sourceDB->RemoveHeaderMdbRow(aHdr);
+
+  destMailDB->SetSummaryValid(true);
+  aDestFolder->UpdateSummaryTotals(true);
+  destMailDB->Commit(nsMsgDBCommitType::kLargeCommit);
+  return rv;
+}
+
+NS_IMETHODIMP
+nsMsgMaildirStore::GetMsgInputStream(nsIMsgFolder *aMsgFolder,
+                                     const nsACString &aMsgToken,
+                                     int64_t *aOffset,
+                                     nsIMsgDBHdr *aMsgHdr,
+                                     bool *aReusable,
+                                     nsIInputStream **aResult)
+{
+  NS_ENSURE_ARG_POINTER(aMsgFolder);
+  NS_ENSURE_ARG_POINTER(aOffset);
+  NS_ENSURE_ARG_POINTER(aResult);
+
+  *aReusable = false; // message per file
+  *aOffset = 0;
+
+  // construct path to file
+  nsCOMPtr<nsIFile> path;
+  nsresult rv = aMsgFolder->GetFilePath(getter_AddRefs(path));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  if (aMsgToken.IsEmpty())
+  {
+    MOZ_LOG(MailDirLog, mozilla::LogLevel::Info,
+           ("GetMsgInputStream - empty storeToken!!\n"));
+    return NS_ERROR_FAILURE;
+  }
+
+  path->Append(NS_LITERAL_STRING("cur"));
+
+  // let's check if the folder exists
+  bool exists;
+  path->Exists(&exists);
+  if (!exists) {
+    MOZ_LOG(MailDirLog, mozilla::LogLevel::Info,
+           ("GetMsgInputStream - oops! cur subfolder does not exist!\n"));
+    rv = path->Create(nsIFile::DIRECTORY_TYPE, 0755);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  path->AppendNative(aMsgToken);
+  return NS_NewLocalFileInputStream(aResult, path);
+}
+
+NS_IMETHODIMP nsMsgMaildirStore::DeleteMessages(nsIArray *aHdrArray)
+{
+  uint32_t messageCount;
+  nsresult rv = aHdrArray->GetLength(&messageCount);
+  NS_ENSURE_SUCCESS(rv, rv);
+  nsCOMPtr<nsIMsgFolder> folder;
+
+  for (uint32_t i = 0; i < messageCount; i++)
+  {
+    nsCOMPtr<nsIMsgDBHdr> msgHdr = do_QueryElementAt(aHdrArray, i, &rv);
+    if (NS_FAILED(rv))
+      continue;
+    msgHdr->GetFolder(getter_AddRefs(folder));
+    nsCOMPtr<nsIFile> path;
+    rv = folder->GetFilePath(getter_AddRefs(path));
+    NS_ENSURE_SUCCESS(rv, rv);
+    nsAutoCString fileName;
+    msgHdr->GetStringProperty("storeToken", getter_Copies(fileName));
+
+    if (fileName.IsEmpty())
+    {
+      MOZ_LOG(MailDirLog, mozilla::LogLevel::Info,
+             ("DeleteMessages - empty storeToken!!\n"));
+      // Perhaps an offline store has not downloaded this particular message.
+      continue;
+    }
+
+    path->Append(NS_LITERAL_STRING("cur"));
+    path->AppendNative(fileName);
+
+    // Let's check if the message exists.
+    bool exists;
+    path->Exists(&exists);
+    if (!exists)
+    {
+      MOZ_LOG(MailDirLog, mozilla::LogLevel::Info,
+             ("DeleteMessages - file does not exist !!\n"));
+      // Perhaps an offline store has not downloaded this particular message.
+      continue;
+    }
+    path->Remove(false);
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsMsgMaildirStore::CopyMessages(bool aIsMove, nsIArray *aHdrArray,
+                               nsIMsgFolder *aDstFolder,
+                               nsIMsgCopyServiceListener *aListener,
+                               nsIArray **aDstHdrs,
+                               nsITransaction **aUndoAction,
+                               bool *aCopyDone)
+{
+  NS_ENSURE_ARG_POINTER(aHdrArray);
+  NS_ENSURE_ARG_POINTER(aDstFolder);
+  NS_ENSURE_ARG_POINTER(aCopyDone);
+  NS_ENSURE_ARG_POINTER(aUndoAction);
+
+  *aCopyDone = false;
+
+  nsCOMPtr<nsIMsgFolder> srcFolder;
+  nsresult rv;
+  nsCOMPtr<nsIMsgDBHdr> msgHdr = do_QueryElementAt(aHdrArray, 0, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = msgHdr->GetFolder(getter_AddRefs(srcFolder));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // Both source and destination folders must use maildir type store.
+  nsCOMPtr<nsIMsgPluggableStore> srcStore;
+  nsAutoCString srcType;
+  srcFolder->GetMsgStore(getter_AddRefs(srcStore));
+  if (srcStore)
+    srcStore->GetStoreType(srcType);
+  nsCOMPtr<nsIMsgPluggableStore> dstStore;
+  nsAutoCString dstType;
+  aDstFolder->GetMsgStore(getter_AddRefs(dstStore));
+  if (dstStore)
+    dstStore->GetStoreType(dstType);
+  if (!srcType.EqualsLiteral("maildir") || !dstType.EqualsLiteral("maildir"))
+    return NS_OK;
+
+  // Both source and destination must be local folders. In theory we could
+  //   do efficient copies of the offline store of IMAP, but this is not
+  //   supported yet. For that, we need to deal with both correct handling
+  //   of deletes from the src server, and msgKey = UIDL in the dst folder.
+  nsCOMPtr<nsIMsgLocalMailFolder> destLocalFolder(do_QueryInterface(aDstFolder));
+  if (!destLocalFolder)
+    return NS_OK;
+  nsCOMPtr<nsIMsgLocalMailFolder> srcLocalFolder(do_QueryInterface(srcFolder));
+  if (!srcLocalFolder)
+    return NS_OK;
+
+  // We should be able to use a file move for an efficient copy.
+
+  nsCOMPtr<nsIFile> destFolderPath;
+  nsCOMPtr<nsIMsgDatabase> destDB;
+  aDstFolder->GetMsgDatabase(getter_AddRefs(destDB));
+  rv = aDstFolder->GetFilePath(getter_AddRefs(destFolderPath));
+  NS_ENSURE_SUCCESS(rv, rv);
+  destFolderPath->Append(NS_LITERAL_STRING("cur"));
+
+  nsCOMPtr<nsIFile> srcFolderPath;
+  rv = srcFolder->GetFilePath(getter_AddRefs(srcFolderPath));
+  NS_ENSURE_SUCCESS(rv, rv);
+  srcFolderPath->Append(NS_LITERAL_STRING("cur"));
+
+  nsCOMPtr<nsIMsgDatabase> srcDB;
+  srcFolder->GetMsgDatabase(getter_AddRefs(srcDB));
+  RefPtr<nsLocalMoveCopyMsgTxn> msgTxn = new nsLocalMoveCopyMsgTxn;
+  NS_ENSURE_TRUE(msgTxn, NS_ERROR_OUT_OF_MEMORY);
+  if (NS_SUCCEEDED(msgTxn->Init(srcFolder, aDstFolder, aIsMove)))
+  {
+    if (aIsMove)
+      msgTxn->SetTransactionType(nsIMessenger::eMoveMsg);
+    else
+      msgTxn->SetTransactionType(nsIMessenger::eCopyMsg);
+  }
+
+  if (aListener)
+    aListener->OnStartCopy();
+
+  nsCOMPtr<nsIMutableArray> dstHdrs(do_CreateInstance(NS_ARRAY_CONTRACTID, &rv));
+  NS_ENSURE_SUCCESS(rv, rv);
+  uint32_t messageCount;
+  rv = aHdrArray->GetLength(&messageCount);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  for (uint32_t i = 0; i < messageCount; i++)
+  {
+    nsCOMPtr<nsIMsgDBHdr> srcHdr = do_QueryElementAt(aHdrArray, i, &rv);
+    if (NS_FAILED(rv))
+    {
+      MOZ_LOG(MailDirLog, mozilla::LogLevel::Info,
+             ("srcHdr null\n"));
+      continue;
+    }
+    nsMsgKey srcKey;
+    srcHdr->GetMessageKey(&srcKey);
+    msgTxn->AddSrcKey(srcKey);
+    nsAutoCString fileName;
+    srcHdr->GetStringProperty("storeToken", getter_Copies(fileName));
+    if (fileName.IsEmpty())
+    {
+      MOZ_LOG(MailDirLog, mozilla::LogLevel::Info,
+             ("GetMsgInputStream - empty storeToken!!\n"));
+      return NS_ERROR_FAILURE;
+    }
+
+    nsCOMPtr<nsIFile> srcFile;
+    rv = srcFolderPath->Clone(getter_AddRefs(srcFile));
+    NS_ENSURE_SUCCESS(rv, rv);
+    srcFile->AppendNative(fileName);
+
+    nsCOMPtr<nsIFile> destFile;
+    destFolderPath->Clone(getter_AddRefs(destFile));
+    destFile->AppendNative(fileName);
+    bool exists;
+    destFile->Exists(&exists);
+    if (exists)
+    {
+      rv = destFile->CreateUnique(nsIFile::NORMAL_FILE_TYPE, 0600);
+      NS_ENSURE_SUCCESS(rv, rv);
+      destFile->GetNativeLeafName(fileName);
+    }
+    if (aIsMove)
+      rv = srcFile->MoveToNative(destFolderPath, fileName);
+    else
+      rv = srcFile->CopyToNative(destFolderPath, fileName);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    nsCOMPtr<nsIMsgDBHdr> destHdr;
+    if (destDB)
+    {
+      rv = destDB->CopyHdrFromExistingHdr(nsMsgKey_None, srcHdr, true, getter_AddRefs(destHdr));
+      NS_ENSURE_SUCCESS(rv, rv);
+      destHdr->SetStringProperty("storeToken", fileName.get());
+      dstHdrs->AppendElement(destHdr, false);
+      nsMsgKey dstKey;
+      destHdr->GetMessageKey(&dstKey);
+      msgTxn->AddDstKey(dstKey);
+      if (aListener)
+        aListener->SetMessageKey(dstKey);
+    }
+  }
+  nsCOMPtr<nsIMsgFolderNotificationService> notifier(do_GetService(NS_MSGNOTIFICATIONSERVICE_CONTRACTID));
+  if (notifier)
+    notifier->NotifyMsgsMoveCopyCompleted(aIsMove, aHdrArray, aDstFolder,
+                                          dstHdrs);
+
+  // For now, we only support local dest folders, and for those we are done and
+  // can delete the messages. Perhaps this should be moved into the folder
+  // when we try to support other folder types.
+  if (aIsMove)
+  {
+    for (uint32_t i = 0; i < messageCount; ++i)
+    {
+      nsCOMPtr<nsIMsgDBHdr> msgDBHdr(do_QueryElementAt(aHdrArray, i, &rv));
+      rv = srcDB->DeleteHeader(msgDBHdr, nullptr, false, true);
+    }
+  }
+
+  *aCopyDone = true;
+  nsCOMPtr<nsISupports> srcSupports(do_QueryInterface(srcFolder));
+  if (destLocalFolder)
+    destLocalFolder->OnCopyCompleted(srcSupports, true);
+  if (aListener)
+    aListener->OnStopCopy(NS_OK);
+  msgTxn.forget(aUndoAction);
+  dstHdrs.forget(aDstHdrs);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsMsgMaildirStore::GetSupportsCompaction(bool *aSupportsCompaction)
+{
+  NS_ENSURE_ARG_POINTER(aSupportsCompaction);
+  *aSupportsCompaction = false;
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsMsgMaildirStore::CompactFolder(nsIMsgFolder *aFolder,
+                                               nsIUrlListener *aListener,
+                                               nsIMsgWindow *aMsgWindow)
+{
+  return NS_OK;
+}
+
+class MaildirStoreParser
+{
+public:
+  MaildirStoreParser(nsIMsgFolder *aFolder, nsIMsgDatabase *aMsgDB,
+                     nsISimpleEnumerator *aDirectoryEnumerator,
+                     nsIUrlListener *aUrlListener);
+  virtual ~MaildirStoreParser();
+
+  nsresult ParseNextMessage(nsIFile *aFile);
+  static void TimerCallback(nsITimer *aTimer, void *aClosure);
+  nsresult StartTimer();
+
+  nsCOMPtr<nsISimpleEnumerator> m_directoryEnumerator;
+  nsCOMPtr<nsIMsgFolder> m_folder;
+  nsCOMPtr<nsIMsgDatabase> m_db;
+  nsCOMPtr<nsITimer> m_timer;
+  nsCOMPtr<nsIUrlListener> m_listener;
+};
+
+MaildirStoreParser::MaildirStoreParser(nsIMsgFolder *aFolder,
+                                       nsIMsgDatabase *aMsgDB,
+                                       nsISimpleEnumerator *aDirEnum,
+                                       nsIUrlListener *aUrlListener)
+{
+  m_folder = aFolder;
+  m_db = aMsgDB;
+  m_directoryEnumerator = aDirEnum;
+  m_listener = aUrlListener;
+}
+
+MaildirStoreParser::~MaildirStoreParser()
+{
+}
+
+nsresult MaildirStoreParser::ParseNextMessage(nsIFile *aFile)
+{
+  nsresult rv;
+  nsCOMPtr<nsIInputStream> inputStream;
+  nsCOMPtr<nsIMsgParseMailMsgState> msgParser =
+    do_CreateInstance(NS_PARSEMAILMSGSTATE_CONTRACTID, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+  msgParser->SetMailDB(m_db);
+  nsCOMPtr<nsIMsgDBHdr> newMsgHdr;
+  rv = m_db->CreateNewHdr(nsMsgKey_None, getter_AddRefs(newMsgHdr));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  newMsgHdr->SetMessageOffset(0);
+
+  rv = NS_NewLocalFileInputStream(getter_AddRefs(inputStream), aFile);
+  if (NS_SUCCEEDED(rv) && inputStream)
+  {
+    nsMsgLineStreamBuffer *inputStreamBuffer =
+      new nsMsgLineStreamBuffer(FILE_IO_BUFFER_SIZE, true, false);
+    int64_t fileSize;
+    aFile->GetFileSize(&fileSize);
+    msgParser->SetNewMsgHdr(newMsgHdr);
+    msgParser->SetState(nsIMsgParseMailMsgState::ParseHeadersState);
+    msgParser->SetEnvelopePos(0);
+    bool needMoreData = false;
+    char * newLine = nullptr;
+    uint32_t numBytesInLine = 0;
+    // we only have to read the headers, because we know the message size
+    // from the file size. So we can do this in one time slice.
+    do
+    {
+      newLine = inputStreamBuffer->ReadNextLine(inputStream, numBytesInLine,
+                                                needMoreData);
+      if (newLine)
+      {
+        msgParser->ParseAFolderLine(newLine, numBytesInLine);
+        NS_Free(newLine);
+      }
+    } while (newLine && numBytesInLine > 0);
+
+    msgParser->FinishHeader();
+    // A single message needs to be less than 4GB
+    newMsgHdr->SetMessageSize((uint32_t) fileSize);
+    m_db->AddNewHdrToDB(newMsgHdr, true);
+    nsAutoCString storeToken;
+    aFile->GetNativeLeafName(storeToken);
+    newMsgHdr->SetStringProperty("storeToken", storeToken.get());
+  }
+  NS_ENSURE_SUCCESS(rv, rv);
+  return rv;
+}
+
+void MaildirStoreParser::TimerCallback(nsITimer *aTimer, void *aClosure)
+{
+  MaildirStoreParser *parser = (MaildirStoreParser *) aClosure;
+  bool hasMore;
+  parser->m_directoryEnumerator->HasMoreElements(&hasMore);
+  if (!hasMore)
+  {
+    nsCOMPtr<nsIMsgPluggableStore> store;
+    parser->m_folder->GetMsgStore(getter_AddRefs(store));
+    parser->m_timer->Cancel();
+    parser->m_db->SetSummaryValid(true);
+//    store->SetSummaryFileValid(parser->m_folder, parser->m_db, true);
+    if (parser->m_listener)
+    {
+      nsresult rv;
+      nsCOMPtr<nsIMailboxUrl> mailboxurl =
+        do_CreateInstance(NS_MAILBOXURL_CONTRACTID, &rv);
+      if (NS_SUCCEEDED(rv) && mailboxurl)
+      {
+        nsCOMPtr<nsIMsgMailNewsUrl> url = do_QueryInterface(mailboxurl);
+        url->SetUpdatingFolder(true);
+        nsAutoCString uriSpec("mailbox://");
+        // ### TODO - what if SetSpec fails?
+        (void) url->SetSpec(uriSpec);
+        parser->m_listener->OnStopRunningUrl(url, NS_OK);
+      }
+    }
+    // Parsing complete and timer cancelled, so we release the parser object.
+    delete parser;
+    return;
+  }
+  nsCOMPtr<nsISupports> aSupport;
+  parser->m_directoryEnumerator->GetNext(getter_AddRefs(aSupport));
+  nsresult rv;
+  nsCOMPtr<nsIFile> currentFile(do_QueryInterface(aSupport, &rv));
+  NS_ENSURE_SUCCESS_VOID(rv);
+  parser->ParseNextMessage(currentFile);
+  // ### TODO - what if this fails?
+}
+
+nsresult MaildirStoreParser::StartTimer()
+{
+  nsresult rv;
+  m_timer = do_CreateInstance("@mozilla.org/timer;1", &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+  m_timer->InitWithFuncCallback(TimerCallback, (void *) this, 0,
+                                          nsITimer::TYPE_REPEATING_SLACK);
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsMsgMaildirStore::RebuildIndex(nsIMsgFolder *aFolder,
+                                              nsIMsgDatabase *aMsgDB,
+                                              nsIMsgWindow *aMsgWindow,
+                                              nsIUrlListener *aListener)
+{
+  NS_ENSURE_ARG_POINTER(aFolder);
+  // This code needs to iterate over the maildir files, and parse each
+  // file and add a msg hdr to the db for the file.
+  nsCOMPtr<nsIFile> path;
+  nsresult rv = aFolder->GetFilePath(getter_AddRefs(path));
+  NS_ENSURE_SUCCESS(rv, rv);
+  path->Append(NS_LITERAL_STRING("cur"));
+
+  nsCOMPtr<nsISimpleEnumerator> directoryEnumerator;
+  rv = path->GetDirectoryEntries(getter_AddRefs(directoryEnumerator));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  MaildirStoreParser *fileParser = new MaildirStoreParser(aFolder, aMsgDB,
+                                                          directoryEnumerator,
+                                                          aListener);
+  NS_ENSURE_TRUE(fileParser, NS_ERROR_OUT_OF_MEMORY);
+  fileParser->StartTimer();
+  ResetForceReparse(aMsgDB);
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsMsgMaildirStore::ChangeFlags(nsIArray *aHdrArray,
+                                             uint32_t aFlags,
+                                             bool aSet)
+{
+  NS_ENSURE_ARG_POINTER(aHdrArray);
+
+  uint32_t messageCount;
+  nsresult rv = aHdrArray->GetLength(&messageCount);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  for (uint32_t i = 0; i < messageCount; i++)
+  {
+    nsCOMPtr<nsIMsgDBHdr> msgHdr = do_QueryElementAt(aHdrArray, i, &rv);
+    // get output stream for header
+    nsCOMPtr<nsIOutputStream> outputStream;
+    rv = GetOutputStream(msgHdr, outputStream);
+    NS_ENSURE_SUCCESS(rv, rv);
+    // Seek to x-mozilla-status offset and rewrite value.
+    rv = UpdateFolderFlag(msgHdr, aSet, aFlags, outputStream);
+    if (NS_FAILED(rv))
+      NS_WARNING("updateFolderFlag failed");
+  }
+  return NS_OK;
+}
+
+// get output stream from header
+nsresult
+nsMsgMaildirStore::GetOutputStream(nsIMsgDBHdr *aHdr,
+                                   nsCOMPtr<nsIOutputStream> &aOutputStream)
+{
+  // file name is stored in message header property "storeToken"
+  nsAutoCString fileName;
+  aHdr->GetStringProperty("storeToken", getter_Copies(fileName));
+  if (fileName.IsEmpty())
+    return NS_ERROR_FAILURE;
+
+  nsCOMPtr<nsIMsgFolder> folder;
+  nsresult rv = aHdr->GetFolder(getter_AddRefs(folder));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsIFile> folderPath;
+  rv = folder->GetFilePath(getter_AddRefs(folderPath));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsIFile> maildirFile;
+  folderPath->Clone(getter_AddRefs(maildirFile));
+  maildirFile->Append(NS_LITERAL_STRING("cur"));
+  maildirFile->AppendNative(fileName);
+
+  return MsgGetFileStream(maildirFile, getter_AddRefs(aOutputStream));
+}
+
+NS_IMETHODIMP nsMsgMaildirStore::ChangeKeywords(nsIArray *aHdrArray,
+                                             const nsACString &aKeywords,
+                                             bool aAdd)
+{
+  NS_ENSURE_ARG_POINTER(aHdrArray);
+  NS_ENSURE_ARG_POINTER(aHdrArray);
+  nsCOMPtr<nsIOutputStream> outputStream;
+  nsCOMPtr<nsISeekableStream> seekableStream;
+
+  uint32_t messageCount;
+  nsresult rv = aHdrArray->GetLength(&messageCount);
+  NS_ENSURE_SUCCESS(rv, rv);
+  if (!messageCount)
+    return NS_ERROR_INVALID_ARG;
+
+  nsAutoPtr<nsLineBuffer<char> > lineBuffer(new nsLineBuffer<char>);
+  NS_ENSURE_TRUE(lineBuffer, NS_ERROR_OUT_OF_MEMORY);
+
+  nsTArray<nsCString> keywordArray;
+  ParseString(aKeywords, ' ', keywordArray);
+
+  for (uint32_t i = 0; i < messageCount; ++i) // for each message
+  {
+    nsCOMPtr<nsIMsgDBHdr> message = do_QueryElementAt(aHdrArray, i, &rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+    // get output stream for header
+    nsCOMPtr<nsIOutputStream> outputStream;
+    rv = GetOutputStream(message, outputStream);
+    NS_ENSURE_SUCCESS(rv, rv);
+    nsCOMPtr <nsIInputStream> inputStream = do_QueryInterface(outputStream, &rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+    nsCOMPtr <nsISeekableStream> seekableStream(do_QueryInterface(inputStream, &rv));
+    NS_ENSURE_SUCCESS(rv, rv);
+    uint32_t statusOffset = 0;
+    (void)message->GetStatusOffset(&statusOffset);
+    uint64_t desiredOffset = statusOffset;
+
+    ChangeKeywordsHelper(message, desiredOffset, lineBuffer, keywordArray,
+                         aAdd, outputStream, seekableStream, inputStream);
+    if (inputStream)
+      inputStream->Close();
+    // ### TODO - if growKeywords property is set on the message header,
+    // we need to rewrite the message file with extra room for the keywords,
+    // or schedule some sort of background task to do this.
+  }
+  lineBuffer = nullptr;
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsMsgMaildirStore::GetStoreType(nsACString& aType)
+{
+  aType.AssignLiteral("maildir");
+  return NS_OK;
+}
+
+/**
+ * Finds the directory associated with this folder. That is if the path is
+ * c:\Inbox, it will return c:\Inbox.sbd if it succeeds. Path is strictly
+ * an out parameter.
+ */
+nsresult nsMsgMaildirStore::GetDirectoryForFolder(nsIFile *path)
+{
+  // add directory separator to the path
+  nsAutoString leafName;
+  path->GetLeafName(leafName);
+  leafName.AppendLiteral(FOLDER_SUFFIX);
+  return path->SetLeafName(leafName);
+}
+
+nsresult nsMsgMaildirStore::CreateDirectoryForFolder(nsIFile *path,
+                                                     bool aIsServer)
+{
+  nsresult rv = NS_OK;
+  if (!aIsServer)
+  {
+    rv = GetDirectoryForFolder(path);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+  bool pathIsDirectory = false;
+  path->IsDirectory(&pathIsDirectory);
+  if (!pathIsDirectory)
+  {
+    bool pathExists;
+    path->Exists(&pathExists);
+    //If for some reason there's a file with the directory separator
+    //then we are going to fail.
+    rv = pathExists ? NS_MSG_COULD_NOT_CREATE_DIRECTORY :
+         path->Create(nsIFile::DIRECTORY_TYPE, 0700);
+  }
+  return rv;
+}
diff --git a/mailnews/local/src/nsMsgMaildirStore.h b/mailnews/local/src/nsMsgMaildirStore.h
new file mode 100644
index 000000000..f15944e5d
--- /dev/null
+++ b/mailnews/local/src/nsMsgMaildirStore.h
@@ -0,0 +1,38 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+   Class for handling Maildir stores.
+*/
+
+#ifndef nsMsgMaildirStore_h__
+#define nsMsgMaildirStore_h__
+
+#include "nsMsgLocalStoreUtils.h"
+#include "nsIFile.h"
+#include "nsMsgMessageFlags.h"
+
+class nsMsgMaildirStore final : public nsMsgLocalStoreUtils, nsIMsgPluggableStore
+{
+public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIMSGPLUGGABLESTORE
+
+  nsMsgMaildirStore();
+
+private:
+  ~nsMsgMaildirStore();
+
+protected:
+  nsresult GetDirectoryForFolder(nsIFile *path);
+  nsresult CreateDirectoryForFolder(nsIFile *path, bool aIsServer);
+
+  nsresult CreateMaildir(nsIFile *path);
+  nsresult AddSubFolders(nsIMsgFolder *parent, nsIFile *path, bool deep);
+  nsresult GetOutputStream(nsIMsgDBHdr *aHdr,
+                           nsCOMPtr<nsIOutputStream> &aOutputStream);
+
+};
+#endif
diff --git a/mailnews/local/src/nsNoIncomingServer.cpp b/mailnews/local/src/nsNoIncomingServer.cpp
new file mode 100644
index 000000000..1c18bf7fd
--- /dev/null
+++ b/mailnews/local/src/nsNoIncomingServer.cpp
@@ -0,0 +1,206 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "msgCore.h" // pre-compiled headers
+
+#include "prmem.h"
+#include "plstr.h"
+#include "prprf.h"
+#include "nsNoIncomingServer.h"
+#include "nsMsgLocalCID.h"
+#include "nsMsgFolderFlags.h"
+#include "nsIMsgLocalMailFolder.h"
+#include "nsIMsgMailSession.h"
+#include "nsMsgBaseCID.h"
+#include "nsIMsgAccountManager.h"
+#include "nsIPop3IncomingServer.h"
+#include "nsServiceManagerUtils.h"
+#include "nsMsgUtils.h"
+
+NS_IMPL_ISUPPORTS_INHERITED(nsNoIncomingServer,
+                            nsMsgIncomingServer,
+                            nsINoIncomingServer,
+                            nsILocalMailIncomingServer)
+
+nsNoIncomingServer::nsNoIncomingServer()
+{
+}
+
+nsNoIncomingServer::~nsNoIncomingServer()
+{
+}
+
+NS_IMETHODIMP
+nsNoIncomingServer::GetLocalStoreType(nsACString& type)
+{
+  type.AssignLiteral("mailbox");
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsNoIncomingServer::GetLocalDatabaseType(nsACString& type)
+{
+  type.AssignLiteral("mailbox");
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsNoIncomingServer::GetAccountManagerChrome(nsAString& aResult)
+{
+  aResult.AssignLiteral("am-serverwithnoidentities.xul");
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsNoIncomingServer::SetFlagsOnDefaultMailboxes()
+{
+  nsCOMPtr<nsIMsgFolder> rootFolder;
+  nsresult rv = GetRootFolder(getter_AddRefs(rootFolder));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsIMsgLocalMailFolder> localFolder =
+      do_QueryInterface(rootFolder, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // None server may have an inbox if it's deferred to,
+  // or if it's the smart mailboxes account.
+  localFolder->SetFlagsOnDefaultMailboxes(nsMsgFolderFlags::SpecialUse);
+
+  return NS_OK;
+}
+
+// TODO: make this work with maildir message store, bug 890742.
+NS_IMETHODIMP nsNoIncomingServer::CopyDefaultMessages(const char *folderNameOnDisk)
+{
+  NS_ENSURE_ARG(folderNameOnDisk);
+
+  nsresult rv;
+  nsCOMPtr<nsIMsgMailSession> mailSession = do_GetService(NS_MSGMAILSESSION_CONTRACTID, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // Get defaults directory for messenger files. MailSession service appends 'messenger' to the
+  // the app defaults folder and returns it. Locale will be added to the path, if there is one.
+  nsCOMPtr<nsIFile> defaultMessagesFile;
+  rv = mailSession->GetDataFilesDir("messenger", getter_AddRefs(defaultMessagesFile));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // check if bin/defaults/messenger/<folderNameOnDisk>
+  // (or bin/defaults/messenger/<locale>/<folderNameOnDisk> if we had a locale provide) exists.
+  // it doesn't have to exist.  if it doesn't, return
+  rv = defaultMessagesFile->AppendNative(nsDependentCString(folderNameOnDisk));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  bool exists;
+  rv = defaultMessagesFile->Exists(&exists);
+  NS_ENSURE_SUCCESS(rv, rv);
+  if (!exists)
+    return NS_OK;
+
+  nsCOMPtr<nsIFile> parentDir;
+  rv = GetLocalPath(getter_AddRefs(parentDir));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // check if parentDir/<folderNameOnDisk> exists
+  {
+    nsCOMPtr<nsIFile> testDir;
+    rv = parentDir->Clone(getter_AddRefs(testDir));
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    rv = testDir->AppendNative(nsDependentCString(folderNameOnDisk));
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    rv = testDir->Exists(&exists);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  // if it exists add to the end, else copy
+  if (exists)
+  {
+#ifdef DEBUG
+    printf("append default %s (unimplemented)\n", folderNameOnDisk);
+#endif
+    // todo for bug #1181 (the bug ID seems wrong...)
+    // open folderFile, seek to end
+    // read defaultMessagesFile, write to folderFile
+  }
+  else {
+#ifdef DEBUG
+    printf("copy default %s\n",folderNameOnDisk);
+#endif
+    rv = defaultMessagesFile->CopyTo(parentDir, EmptyString());
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+  return NS_OK;
+}
+
+
+NS_IMETHODIMP nsNoIncomingServer::CreateDefaultMailboxes()
+{
+  nsresult rv;
+  bool isHidden = false;
+  GetHidden(&isHidden);
+  if (isHidden)
+    return NS_OK;
+
+  // notice, no Inbox, unless we're deferred to...
+  bool isDeferredTo;
+  if (NS_SUCCEEDED(GetIsDeferredTo(&isDeferredTo)) && isDeferredTo)
+  {
+    rv = CreateLocalFolder(NS_LITERAL_STRING("Inbox"));
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  rv = CreateLocalFolder(NS_LITERAL_STRING("Trash"));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // copy the default templates into the Templates folder
+  rv = CopyDefaultMessages("Templates");
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  return CreateLocalFolder(NS_LITERAL_STRING("Unsent Messages"));
+}
+
+NS_IMETHODIMP
+nsNoIncomingServer::GetNewMail(nsIMsgWindow *aMsgWindow, nsIUrlListener *aUrlListener, nsIMsgFolder *aInbox, nsIURI **aResult)
+{
+  nsCOMArray<nsIPop3IncomingServer> deferredServers;
+  nsresult rv = GetDeferredServers(this, deferredServers);
+  NS_ENSURE_SUCCESS(rv, rv);
+  if (!deferredServers.IsEmpty())
+  {
+    rv = deferredServers[0]->DownloadMailFromServers(deferredServers.Elements(),
+       deferredServers.Length(), aMsgWindow, aInbox, aUrlListener);
+  }
+  // listener might be counting on us to send a notification.
+  else if (aUrlListener)
+    aUrlListener->OnStopRunningUrl(nullptr, NS_OK);
+  return rv;
+}
+
+
+NS_IMETHODIMP
+nsNoIncomingServer::GetCanSearchMessages(bool *canSearchMessages)
+{
+  NS_ENSURE_ARG_POINTER(canSearchMessages);
+  *canSearchMessages = true;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsNoIncomingServer::GetServerRequiresPasswordForBiff(bool *aServerRequiresPasswordForBiff)
+{
+  NS_ENSURE_ARG_POINTER(aServerRequiresPasswordForBiff);
+  *aServerRequiresPasswordForBiff = false;  // for local folders, we don't require a password
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsNoIncomingServer::GetSortOrder(int32_t* aSortOrder)
+{
+  NS_ENSURE_ARG_POINTER(aSortOrder);
+  *aSortOrder = 200000000;
+  return NS_OK;
+}
+
diff --git a/mailnews/local/src/nsNoIncomingServer.h b/mailnews/local/src/nsNoIncomingServer.h
new file mode 100644
index 000000000..809531627
--- /dev/null
+++ b/mailnews/local/src/nsNoIncomingServer.h
@@ -0,0 +1,41 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef __nsNoIncomingServer_h
+#define __nsNoIncomingServer_h
+
+#include "mozilla/Attributes.h"
+#include "msgCore.h"
+#include "nsINoIncomingServer.h"
+#include "nsILocalMailIncomingServer.h"
+#include "nsMsgIncomingServer.h"
+#include "nsMailboxServer.h"
+
+/* get some implementation from nsMsgIncomingServer */
+class nsNoIncomingServer : public nsMailboxServer,
+                           public nsINoIncomingServer,
+                           public nsILocalMailIncomingServer
+
+{
+public:
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_NSINOINCOMINGSERVER
+  NS_DECL_NSILOCALMAILINCOMINGSERVER
+
+  nsNoIncomingServer();
+
+  NS_IMETHOD GetLocalStoreType(nsACString& type) override;
+  NS_IMETHOD GetLocalDatabaseType(nsACString& type) override;
+  NS_IMETHOD GetCanSearchMessages(bool *canSearchMessages) override;
+  NS_IMETHOD GetServerRequiresPasswordForBiff(bool *aServerRequiresPasswordForBiff) override;
+  NS_IMETHOD GetAccountManagerChrome(nsAString& aResult) override;
+  NS_IMETHOD GetSortOrder(int32_t* aSortOrder) override;
+
+private:
+  virtual ~nsNoIncomingServer();
+};
+
+
+#endif
diff --git a/mailnews/local/src/nsNoneService.cpp b/mailnews/local/src/nsNoneService.cpp
new file mode 100644
index 000000000..dad56c063
--- /dev/null
+++ b/mailnews/local/src/nsNoneService.cpp
@@ -0,0 +1,168 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "msgCore.h"    // precompiled header...
+
+#include "nsNoneService.h"
+#include "nsINoIncomingServer.h"
+#include "nsINoneService.h"
+#include "nsIMsgProtocolInfo.h"
+
+#include "nsMsgLocalCID.h"
+#include "nsMsgBaseCID.h"
+#include "nsIFile.h"
+#include "nsCOMPtr.h"
+#include "nsMsgUtils.h"
+
+#include "nsIDirectoryService.h"
+#include "nsMailDirServiceDefs.h"
+
+#define PREF_MAIL_ROOT_NONE "mail.root.none"        // old - for backward compatibility only
+#define PREF_MAIL_ROOT_NONE_REL "mail.root.none-rel"
+
+nsNoneService::nsNoneService()
+{
+}
+
+nsNoneService::~nsNoneService()
+{}
+
+NS_IMPL_ISUPPORTS(nsNoneService, nsINoneService, nsIMsgProtocolInfo)
+
+NS_IMETHODIMP
+nsNoneService::SetDefaultLocalPath(nsIFile *aPath)
+{
+    NS_ENSURE_ARG(aPath);
+    return NS_SetPersistentFile(PREF_MAIL_ROOT_NONE_REL, PREF_MAIL_ROOT_NONE, aPath);
+}     
+
+NS_IMETHODIMP
+nsNoneService::GetDefaultLocalPath(nsIFile ** aResult)
+{
+    NS_ENSURE_ARG_POINTER(aResult);
+    *aResult = nullptr;
+    
+    bool havePref;
+    nsCOMPtr<nsIFile> localFile;    
+    nsresult rv = NS_GetPersistentFile(PREF_MAIL_ROOT_NONE_REL,
+                              PREF_MAIL_ROOT_NONE,
+                              NS_APP_MAIL_50_DIR,
+                              havePref,
+                              getter_AddRefs(localFile));
+    if (NS_FAILED(rv)) return rv;
+    
+    bool exists;
+    rv = localFile->Exists(&exists);
+    if (NS_SUCCEEDED(rv) && !exists)
+        rv = localFile->Create(nsIFile::DIRECTORY_TYPE, 0775);
+    if (NS_FAILED(rv)) return rv;
+    
+    if (!havePref || !exists) 
+    {
+        rv = NS_SetPersistentFile(PREF_MAIL_ROOT_NONE_REL, PREF_MAIL_ROOT_NONE, localFile);
+        NS_ASSERTION(NS_SUCCEEDED(rv), "Failed to set root dir pref.");
+    }
+        
+    NS_IF_ADDREF(*aResult = localFile);
+    return NS_OK;
+
+}
+    
+
+NS_IMETHODIMP
+nsNoneService::GetServerIID(nsIID* *aServerIID)
+{
+    *aServerIID = new nsIID(NS_GET_IID(nsINoIncomingServer));
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsNoneService::GetRequiresUsername(bool *aRequiresUsername)
+{
+  NS_ENSURE_ARG_POINTER(aRequiresUsername);
+  *aRequiresUsername = true;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsNoneService::GetPreflightPrettyNameWithEmailAddress(bool *aPreflightPrettyNameWithEmailAddress)
+{
+  NS_ENSURE_ARG_POINTER(aPreflightPrettyNameWithEmailAddress);
+  *aPreflightPrettyNameWithEmailAddress = true;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsNoneService::GetCanLoginAtStartUp(bool *aCanLoginAtStartUp)
+{
+  NS_ENSURE_ARG_POINTER(aCanLoginAtStartUp);
+  *aCanLoginAtStartUp = false;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsNoneService::GetCanDelete(bool *aCanDelete)
+{
+  NS_ENSURE_ARG_POINTER(aCanDelete);
+  *aCanDelete = false;
+  return NS_OK;
+}  
+
+NS_IMETHODIMP
+nsNoneService::GetCanDuplicate(bool *aCanDuplicate)
+{
+  NS_ENSURE_ARG_POINTER(aCanDuplicate);
+  *aCanDuplicate = false;
+  return NS_OK;
+}  
+
+NS_IMETHODIMP
+nsNoneService::GetCanGetMessages(bool *aCanGetMessages)
+{
+    NS_ENSURE_ARG_POINTER(aCanGetMessages);
+    *aCanGetMessages = false;
+    return NS_OK;
+}  
+
+NS_IMETHODIMP
+nsNoneService::GetCanGetIncomingMessages(bool *aCanGetIncomingMessages)
+{
+    NS_ENSURE_ARG_POINTER(aCanGetIncomingMessages);
+    *aCanGetIncomingMessages = false;
+    return NS_OK;
+} 
+
+NS_IMETHODIMP 
+nsNoneService::GetDefaultDoBiff(bool *aDoBiff)
+{
+    NS_ENSURE_ARG_POINTER(aDoBiff);
+    // by default, don't do biff for "none" servers
+    *aDoBiff = false;    
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsNoneService::GetDefaultServerPort(bool isSecure, int32_t *aDefaultPort)
+{
+    NS_ENSURE_ARG_POINTER(aDefaultPort);
+    *aDefaultPort = -1;
+    return NS_OK;
+}
+
+NS_IMETHODIMP 
+nsNoneService::GetShowComposeMsgLink(bool *showComposeMsgLink)
+{
+    NS_ENSURE_ARG_POINTER(showComposeMsgLink);
+    *showComposeMsgLink = false;    
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsNoneService::GetFoldersCreatedAsync(bool *aAsyncCreation)
+{
+  NS_ENSURE_ARG_POINTER(aAsyncCreation);
+  *aAsyncCreation = false;
+  return NS_OK;
+}
diff --git a/mailnews/local/src/nsNoneService.h b/mailnews/local/src/nsNoneService.h
new file mode 100644
index 000000000..fe8495528
--- /dev/null
+++ b/mailnews/local/src/nsNoneService.h
@@ -0,0 +1,28 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsNoneService_h___
+#define nsNoneService_h___
+
+#include "nscore.h"
+
+#include "nsIMsgProtocolInfo.h"
+#include "nsINoneService.h"
+
+class nsNoneService : public nsIMsgProtocolInfo, public nsINoneService
+{
+public:
+
+  nsNoneService();
+
+  NS_DECL_ISUPPORTS
+    NS_DECL_NSIMSGPROTOCOLINFO
+  NS_DECL_NSINONESERVICE
+
+private:
+  virtual ~nsNoneService();
+};
+
+#endif /* nsNoneService_h___ */
diff --git a/mailnews/local/src/nsParseMailbox.cpp b/mailnews/local/src/nsParseMailbox.cpp
new file mode 100644
index 000000000..9d68e5cd1
--- /dev/null
+++ b/mailnews/local/src/nsParseMailbox.cpp
@@ -0,0 +1,2624 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "msgCore.h"
+#include "nsIURI.h"
+#include "nsParseMailbox.h"
+#include "nsIMsgHdr.h"
+#include "nsIMsgDatabase.h"
+#include "nsMsgMessageFlags.h"
+#include "nsIDBFolderInfo.h"
+#include "nsIInputStream.h"
+#include "nsIFile.h"
+#include "nsMsgLocalFolderHdrs.h"
+#include "nsMsgBaseCID.h"
+#include "nsMsgDBCID.h"
+#include "nsIMailboxUrl.h"
+#include "nsNetUtil.h"
+#include "nsMsgFolderFlags.h"
+#include "nsIMsgFolder.h"
+#include "nsIURL.h"
+#include "nsIMsgMailNewsUrl.h"
+#include "nsIMsgFilterList.h"
+#include "nsIMsgFilter.h"
+#include "nsIIOService.h"
+#include "nsNetCID.h"
+#include "nsRDFCID.h"
+#include "nsIRDFService.h"
+#include "nsMsgI18N.h"
+#include "nsAppDirectoryServiceDefs.h"
+#include "nsIMsgLocalMailFolder.h"
+#include "nsMsgUtils.h"
+#include "prprf.h"
+#include "prmem.h"
+#include "nsISeekableStream.h"
+#include "nsIMimeHeaders.h"
+#include "nsIMsgMdnGenerator.h"
+#include "nsMsgSearchCore.h"
+#include "nsMailHeaders.h"
+#include "nsIMsgMailSession.h"
+#include "nsIMsgComposeParams.h"
+#include "nsMsgCompCID.h"
+#include "nsIInterfaceRequestor.h"
+#include "nsIInterfaceRequestorUtils.h"
+#include "nsIDocShell.h"
+#include "nsIMsgCompose.h"
+#include "nsIPrefBranch.h"
+#include "nsIPrefService.h"
+#include "nsIMsgComposeService.h"
+#include "nsIMsgCopyService.h"
+#include "nsICryptoHash.h"
+#include "nsIStringBundle.h"
+#include "nsIMsgFilterPlugin.h"
+#include "nsIMutableArray.h"
+#include "nsArrayUtils.h"
+#include "nsIMsgFilterCustomAction.h"
+#include <ctype.h>
+#include "nsIMsgPluggableStore.h"
+#include "mozilla/Services.h"
+#include "nsQueryObject.h"
+#include "nsIOutputStream.h"
+#include "mozilla/Attributes.h"
+
+static NS_DEFINE_CID(kRDFServiceCID, NS_RDFSERVICE_CID);
+
+/* the following macros actually implement addref, release and query interface for our component. */
+NS_IMPL_ISUPPORTS_INHERITED(nsMsgMailboxParser,
+                             nsParseMailMessageState,
+                             nsIStreamListener,
+                             nsIRequestObserver)
+
+// Whenever data arrives from the connection, core netlib notifices the protocol by calling
+// OnDataAvailable. We then read and process the incoming data from the input stream.
+NS_IMETHODIMP nsMsgMailboxParser::OnDataAvailable(nsIRequest *request, nsISupports *ctxt, nsIInputStream *aIStream, uint64_t sourceOffset, uint32_t aLength)
+{
+    // right now, this really just means turn around and process the url
+    nsresult rv = NS_OK;
+    nsCOMPtr<nsIURI> url = do_QueryInterface(ctxt, &rv);
+    if (NS_SUCCEEDED(rv))
+        rv = ProcessMailboxInputStream(url, aIStream, aLength);
+    return rv;
+}
+
+NS_IMETHODIMP nsMsgMailboxParser::OnStartRequest(nsIRequest *request, nsISupports *ctxt)
+{
+    m_startTime = PR_Now();
+
+
+    // extract the appropriate event sinks from the url and initialize them in our protocol data
+    // the URL should be queried for a nsIMailboxURL. If it doesn't support a mailbox URL interface then
+    // we have an error.
+    nsresult rv = NS_OK;
+
+    nsCOMPtr<nsIIOService> ioServ =
+      mozilla::services::GetIOService();
+    NS_ENSURE_TRUE(ioServ, NS_ERROR_UNEXPECTED);
+
+    nsCOMPtr<nsIMailboxUrl> runningUrl = do_QueryInterface(ctxt, &rv);
+
+    nsCOMPtr<nsIMsgMailNewsUrl> url = do_QueryInterface(ctxt);
+    nsCOMPtr<nsIMsgFolder> folder = do_QueryReferent(m_folder);
+
+    if (NS_SUCCEEDED(rv) && runningUrl && folder)
+    {
+        url->GetStatusFeedback(getter_AddRefs(m_statusFeedback));
+
+        // okay, now fill in our event sinks...Note that each getter ref counts before
+        // it returns the interface to us...we'll release when we are done
+
+        folder->GetName(m_folderName);
+
+        nsCOMPtr<nsIFile> path;
+        folder->GetFilePath(getter_AddRefs(path));
+
+        if (path)
+        {
+          int64_t fileSize;
+          path->GetFileSize(&fileSize);
+            // the size of the mailbox file is our total base line for measuring progress
+            m_graph_progress_total = fileSize;
+            UpdateStatusText("buildingSummary");
+            nsCOMPtr<nsIMsgDBService> msgDBService = do_GetService(NS_MSGDB_SERVICE_CONTRACTID, &rv);
+            if (msgDBService)
+            {
+                // Use OpenFolderDB to always open the db so that db's m_folder
+                // is set correctly.
+                rv = msgDBService->OpenFolderDB(folder, true,
+                                                getter_AddRefs(m_mailDB));
+                if (rv == NS_MSG_ERROR_FOLDER_SUMMARY_MISSING)
+                  rv = msgDBService->CreateNewDB(folder,
+                                                 getter_AddRefs(m_mailDB));
+
+                if (m_mailDB)
+                    m_mailDB->AddListener(this);
+            }
+            NS_ASSERTION(m_mailDB, "failed to open mail db parsing folder");
+
+            // try to get a backup message database
+            nsresult rvignore = folder->GetBackupMsgDatabase(
+                getter_AddRefs(m_backupMailDB));
+
+            // We'll accept failures and move on, as we're dealing with some
+            // sort of unknown problem to begin with.
+            if (NS_FAILED(rvignore))
+            {
+              if (m_backupMailDB)
+                m_backupMailDB->RemoveListener(this);
+              m_backupMailDB = nullptr;
+            }
+            else if (m_backupMailDB)
+            {
+              m_backupMailDB->AddListener(this);
+            }
+        }
+    }
+
+    // need to get the mailbox name out of the url and call SetMailboxName with it.
+    // then, we need to open the mail db for this parser.
+    return rv;
+}
+
+// stop binding is a "notification" informing us that the stream associated with aURL is going away.
+NS_IMETHODIMP nsMsgMailboxParser::OnStopRequest(nsIRequest *request, nsISupports *ctxt, nsresult aStatus)
+{
+    DoneParsingFolder(aStatus);
+    // what can we do? we can close the stream?
+    m_urlInProgress = false;  // don't close the connection...we may be re-using it.
+
+    if (m_mailDB)
+        m_mailDB->RemoveListener(this);
+    // and we want to mark ourselves for deletion or some how inform our protocol manager that we are
+    // available for another url if there is one....
+
+    ReleaseFolderLock();
+    // be sure to clear any status text and progress info..
+    m_graph_progress_received = 0;
+    UpdateProgressPercent();
+    UpdateStatusText("localStatusDocumentDone");
+
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsParseMailMessageState::OnHdrPropertyChanged(nsIMsgDBHdr *aHdrToChange,
+    bool aPreChange, uint32_t *aStatus, nsIDBChangeListener * aInstigator)
+{
+  return NS_OK;
+}
+
+
+NS_IMETHODIMP
+nsParseMailMessageState::OnHdrFlagsChanged(nsIMsgDBHdr *aHdrChanged,
+    uint32_t aOldFlags, uint32_t aNewFlags, nsIDBChangeListener *aInstigator)
+{
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsParseMailMessageState::OnHdrDeleted(nsIMsgDBHdr *aHdrChanged,
+    nsMsgKey aParentKey, int32_t aFlags, nsIDBChangeListener *aInstigator)
+{
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsParseMailMessageState::OnHdrAdded(nsIMsgDBHdr *aHdrAdded,
+    nsMsgKey aParentKey, int32_t aFlags, nsIDBChangeListener *aInstigator)
+{
+    return NS_OK;
+}
+
+/* void OnParentChanged (in nsMsgKey aKeyChanged, in nsMsgKey oldParent, in nsMsgKey newParent, in nsIDBChangeListener aInstigator); */
+NS_IMETHODIMP
+nsParseMailMessageState::OnParentChanged(nsMsgKey aKeyChanged,
+    nsMsgKey oldParent, nsMsgKey newParent, nsIDBChangeListener *aInstigator)
+{
+    return NS_OK;
+}
+
+/* void OnAnnouncerGoingAway (in nsIDBChangeAnnouncer instigator); */
+NS_IMETHODIMP
+nsParseMailMessageState::OnAnnouncerGoingAway(nsIDBChangeAnnouncer *instigator)
+{
+  if (m_backupMailDB && m_backupMailDB == instigator)
+  {
+    m_backupMailDB->RemoveListener(this);
+    m_backupMailDB = nullptr;
+  }
+  else if (m_mailDB)
+  {
+    m_mailDB->RemoveListener(this);
+    m_mailDB = nullptr;
+    m_newMsgHdr = nullptr;
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsParseMailMessageState::OnEvent(nsIMsgDatabase *aDB, const char *aEvent)
+{
+  return NS_OK;
+}
+
+/* void OnReadChanged (in nsIDBChangeListener instigator); */
+NS_IMETHODIMP
+nsParseMailMessageState::OnReadChanged(nsIDBChangeListener *instigator)
+{
+    return NS_OK;
+}
+
+/* void OnJunkScoreChanged (in nsIDBChangeListener instigator); */
+NS_IMETHODIMP
+nsParseMailMessageState::OnJunkScoreChanged(nsIDBChangeListener *instigator)
+{
+    return NS_OK;
+}
+
+nsMsgMailboxParser::nsMsgMailboxParser() : nsMsgLineBuffer(nullptr, false)
+{
+  Init();
+}
+
+nsMsgMailboxParser::nsMsgMailboxParser(nsIMsgFolder *aFolder) : nsMsgLineBuffer(nullptr, false)
+{
+  m_folder = do_GetWeakReference(aFolder);
+}
+
+nsMsgMailboxParser::~nsMsgMailboxParser()
+{
+  ReleaseFolderLock();
+}
+
+nsresult nsMsgMailboxParser::Init()
+{
+  m_obuffer = nullptr;
+  m_obuffer_size = 0;
+  m_graph_progress_total = 0;
+  m_graph_progress_received = 0;
+  return AcquireFolderLock();
+}
+
+void nsMsgMailboxParser::UpdateStatusText (const char* stringName)
+{
+  if (m_statusFeedback)
+  {
+    nsresult rv;
+    nsCOMPtr<nsIStringBundleService> bundleService =
+      mozilla::services::GetStringBundleService();
+    if (!bundleService)
+      return;
+    nsCOMPtr<nsIStringBundle> bundle;
+    rv = bundleService->CreateBundle("chrome://messenger/locale/localMsgs.properties", getter_AddRefs(bundle));
+    if (NS_FAILED(rv))
+      return;
+    nsString finalString;
+    const char16_t * stringArray[] = { m_folderName.get() };
+    rv = bundle->FormatStringFromName(NS_ConvertASCIItoUTF16(stringName).get(),
+                                      stringArray, 1, getter_Copies(finalString));
+    m_statusFeedback->ShowStatusString(finalString);
+  }
+}
+
+void nsMsgMailboxParser::UpdateProgressPercent ()
+{
+  if (m_statusFeedback && m_graph_progress_total != 0)
+  {
+    // prevent overflow by dividing both by 100
+    int64_t progressTotal = m_graph_progress_total / 100;
+    int64_t progressReceived = m_graph_progress_received / 100;
+    if (progressTotal > 0)
+      m_statusFeedback->ShowProgress((100 *(progressReceived))  / progressTotal);
+  }
+}
+
+nsresult nsMsgMailboxParser::ProcessMailboxInputStream(nsIURI* aURL, nsIInputStream *aIStream, uint32_t aLength)
+{
+  nsresult ret = NS_OK;
+
+  uint32_t bytesRead = 0;
+
+  if (NS_SUCCEEDED(m_inputStream.GrowBuffer(aLength)))
+  {
+    // OK, this sucks, but we're going to have to copy into our
+    // own byte buffer, and then pass that to the line buffering code,
+    // which means a couple buffer copies.
+    ret = aIStream->Read(m_inputStream.GetBuffer(), aLength, &bytesRead);
+    if (NS_SUCCEEDED(ret))
+      ret = BufferInput(m_inputStream.GetBuffer(), bytesRead);
+  }
+  if (m_graph_progress_total > 0)
+  {
+    if (NS_SUCCEEDED(ret))
+      m_graph_progress_received += bytesRead;
+  }
+  return (ret);
+}
+
+void nsMsgMailboxParser::DoneParsingFolder(nsresult status)
+{
+  /* End of file.  Flush out any partial line remaining in the buffer. */
+  FlushLastLine();
+  PublishMsgHeader(nullptr);
+
+  // only mark the db valid if we've succeeded.
+  if (NS_SUCCEEDED(status) && m_mailDB)  // finished parsing, so flush db folder info
+    UpdateDBFolderInfo();
+  else if (m_mailDB)
+    m_mailDB->SetSummaryValid(false);
+
+  // remove the backup database
+  if (m_backupMailDB)
+  {
+    nsCOMPtr<nsIMsgFolder> folder = do_QueryReferent(m_folder);
+    if (folder)
+      folder->RemoveBackupMsgDatabase();
+    m_backupMailDB = nullptr;
+  }
+
+  //  if (m_folder != nullptr)
+  //    m_folder->SummaryChanged();
+  FreeBuffers();
+}
+
+void nsMsgMailboxParser::FreeBuffers()
+{
+  /* We're done reading the folder - we don't need these things
+   any more. */
+  PR_FREEIF (m_obuffer);
+  m_obuffer_size = 0;
+}
+
+void nsMsgMailboxParser::UpdateDBFolderInfo()
+{
+  UpdateDBFolderInfo(m_mailDB);
+}
+
+// update folder info in db so we know not to reparse.
+void nsMsgMailboxParser::UpdateDBFolderInfo(nsIMsgDatabase *mailDB)
+{
+  mailDB->SetSummaryValid(true);
+}
+
+// Tell the world about the message header (add to db, and view, if any)
+int32_t nsMsgMailboxParser::PublishMsgHeader(nsIMsgWindow *msgWindow)
+{
+  FinishHeader();
+  if (m_newMsgHdr)
+  {
+    char storeToken[100];
+    PR_snprintf(storeToken, sizeof(storeToken), "%lld", m_envelope_pos);
+    m_newMsgHdr->SetStringProperty("storeToken", storeToken);
+
+    uint32_t flags;
+    (void)m_newMsgHdr->GetFlags(&flags);
+    if (flags & nsMsgMessageFlags::Expunged)
+    {
+      nsCOMPtr<nsIDBFolderInfo> folderInfo;
+      m_mailDB->GetDBFolderInfo(getter_AddRefs(folderInfo));
+      uint32_t size;
+      (void)m_newMsgHdr->GetMessageSize(&size);
+      folderInfo->ChangeExpungedBytes(size);
+      m_newMsgHdr = nullptr;
+    }
+    else if (m_mailDB)
+    {
+      // add hdr but don't notify - shouldn't be requiring notifications
+      // during summary file rebuilding
+      m_mailDB->AddNewHdrToDB(m_newMsgHdr, false);
+      m_newMsgHdr = nullptr;
+    }
+    else
+      NS_ASSERTION(false, "no database while parsing local folder");  // should have a DB, no?
+  }
+  else if (m_mailDB)
+  {
+    nsCOMPtr<nsIDBFolderInfo> folderInfo;
+    m_mailDB->GetDBFolderInfo(getter_AddRefs(folderInfo));
+    if (folderInfo)
+      folderInfo->ChangeExpungedBytes(m_position - m_envelope_pos);
+  }
+  return 0;
+}
+
+void nsMsgMailboxParser::AbortNewHeader()
+{
+  if (m_newMsgHdr && m_mailDB)
+    m_newMsgHdr = nullptr;
+}
+
+void nsMsgMailboxParser::OnNewMessage(nsIMsgWindow *msgWindow)
+{
+  PublishMsgHeader(msgWindow);
+  Clear();
+}
+
+nsresult nsMsgMailboxParser::HandleLine(const char *line, uint32_t lineLength)
+{
+  /* If this is the very first line of a non-empty folder, make sure it's an envelope */
+  if (m_graph_progress_received == 0)
+  {
+    /* This is the first block from the file.  Check to see if this
+       looks like a mail file. */
+    const char *s = line;
+    const char *end = s + lineLength;
+    while (s < end && IS_SPACE(*s))
+      s++;
+    if ((end - s) < 20 || !IsEnvelopeLine(s, end - s))
+    {
+//      char buf[500];
+//      PR_snprintf (buf, sizeof(buf),
+//             XP_GetString(MK_MSG_NON_MAIL_FILE_READ_QUESTION),
+//             folder_name);
+//      else if (!FE_Confirm (m_context, buf))
+//        return NS_MSG_NOT_A_MAIL_FOLDER; /* #### NOT_A_MAIL_FILE */
+    }
+  }
+//  m_graph_progress_received += lineLength;
+
+  // mailbox parser needs to do special stuff when it finds an envelope
+  // after parsing a message body. So do that.
+  if (line[0] == 'F' && IsEnvelopeLine(line, lineLength))
+  {
+    // **** This used to be
+    // PR_ASSERT (m_parseMsgState->m_state == nsMailboxParseBodyState);
+    // **** I am not sure this is a right thing to do. This happens when
+    // going online, downloading a message while playing back append
+    // draft/template offline operation. We are mixing
+        // nsMailboxParseBodyState &&
+    // nsMailboxParseHeadersState. David I need your help here too. **** jt
+
+    NS_ASSERTION (m_state == nsIMsgParseMailMsgState::ParseBodyState ||
+           m_state == nsIMsgParseMailMsgState::ParseHeadersState, "invalid parse state"); /* else folder corrupted */
+    OnNewMessage(nullptr);
+    nsresult rv = StartNewEnvelope(line, lineLength);
+    NS_ASSERTION(NS_SUCCEEDED(rv), " error starting envelope parsing mailbox");
+    // at the start of each new message, update the progress bar
+    UpdateProgressPercent();
+    return rv;
+  }
+
+  // otherwise, the message parser can handle it completely.
+  if (m_mailDB != nullptr)  // if no DB, do we need to parse at all?
+    return ParseFolderLine(line, lineLength);
+
+  return NS_ERROR_NULL_POINTER; // need to error out if we don't have a db.
+}
+
+void
+nsMsgMailboxParser::ReleaseFolderLock()
+{
+  nsresult result;
+  nsCOMPtr<nsIMsgFolder> folder = do_QueryReferent(m_folder);
+  if (!folder)
+    return;
+  bool haveSemaphore;
+  nsCOMPtr <nsISupports> supports = do_QueryInterface(static_cast<nsIMsgParseMailMsgState*>(this));
+  result = folder->TestSemaphore(supports, &haveSemaphore);
+  if (NS_SUCCEEDED(result) && haveSemaphore)
+    (void) folder->ReleaseSemaphore(supports);
+}
+
+nsresult
+nsMsgMailboxParser::AcquireFolderLock()
+{
+  nsCOMPtr<nsIMsgFolder> folder = do_QueryReferent(m_folder);
+  if (!folder)
+    return NS_ERROR_NULL_POINTER;
+  nsCOMPtr<nsISupports> supports = do_QueryObject(this);
+  return folder->AcquireSemaphore(supports);
+}
+
+NS_IMPL_ISUPPORTS(nsParseMailMessageState, nsIMsgParseMailMsgState, nsIDBChangeListener)
+
+nsParseMailMessageState::nsParseMailMessageState()
+{
+  m_position = 0;
+  m_new_key = nsMsgKey_None;
+  m_IgnoreXMozillaStatus = false;
+  m_state = nsIMsgParseMailMsgState::ParseBodyState;
+
+  // setup handling of custom db headers, headers that are added to .msf files
+  // as properties of the nsMsgHdr objects, controlled by the
+  // pref mailnews.customDBHeaders, a space-delimited list of headers.
+  // E.g., if mailnews.customDBHeaders is "X-Spam-Score", and we're parsing
+  // a mail message with the X-Spam-Score header, we'll set the
+  // "x-spam-score" property of nsMsgHdr to the value of the header.
+  m_customDBHeaderValues = nullptr;
+  nsCString customDBHeaders; // not shown in search UI
+  nsCOMPtr<nsIPrefBranch> pPrefBranch(do_GetService(NS_PREFSERVICE_CONTRACTID));
+  if (pPrefBranch)
+  {
+     pPrefBranch->GetCharPref("mailnews.customDBHeaders",  getter_Copies(customDBHeaders));
+     ToLowerCase(customDBHeaders);
+     if (customDBHeaders.Find("content-base") == -1)
+      customDBHeaders.Insert(NS_LITERAL_CSTRING("content-base "), 0);
+     ParseString(customDBHeaders, ' ', m_customDBHeaders);
+
+     // now add customHeaders
+     nsCString customHeadersString; // shown in search UI
+     nsTArray<nsCString> customHeadersArray;
+     pPrefBranch->GetCharPref("mailnews.customHeaders", getter_Copies(customHeadersString));
+     ToLowerCase(customHeadersString);
+     customHeadersString.StripWhitespace();
+     ParseString(customHeadersString, ':', customHeadersArray);
+     for (uint32_t i = 0; i < customHeadersArray.Length(); i++)
+     {
+       if (!m_customDBHeaders.Contains(customHeadersArray[i]))
+         m_customDBHeaders.AppendElement(customHeadersArray[i]);
+     }
+
+     if (m_customDBHeaders.Length())
+     {
+       m_customDBHeaderValues = new struct message_header [m_customDBHeaders.Length()];
+       if (!m_customDBHeaderValues)
+         m_customDBHeaders.Clear();
+     }
+  }
+  Clear();
+}
+
+nsParseMailMessageState::~nsParseMailMessageState()
+{
+  ClearAggregateHeader (m_toList);
+  ClearAggregateHeader (m_ccList);
+  delete [] m_customDBHeaderValues;
+}
+
+void nsParseMailMessageState::Init(uint64_t fileposition)
+{
+  m_state = nsIMsgParseMailMsgState::ParseBodyState;
+  m_position = fileposition;
+  m_newMsgHdr = nullptr;
+}
+
+NS_IMETHODIMP nsParseMailMessageState::Clear()
+{
+  m_message_id.length = 0;
+  m_references.length = 0;
+  m_date.length = 0;
+  m_delivery_date.length = 0;
+  m_from.length = 0;
+  m_sender.length = 0;
+  m_newsgroups.length = 0;
+  m_subject.length = 0;
+  m_status.length = 0;
+  m_mozstatus.length = 0;
+  m_mozstatus2.length = 0;
+  m_envelope_from.length = 0;
+  m_envelope_date.length = 0;
+  m_priority.length = 0;
+  m_keywords.length = 0;
+  m_mdn_dnt.length = 0;
+  m_return_path.length = 0;
+  m_account_key.length = 0;
+  m_in_reply_to.length = 0;
+  m_replyTo.length = 0;
+  m_content_type.length = 0;
+  m_mdn_original_recipient.length = 0;
+  m_bccList.length = 0;
+  m_body_lines = 0;
+  m_newMsgHdr = nullptr;
+  m_envelope_pos = 0;
+  m_new_key = nsMsgKey_None;
+  ClearAggregateHeader (m_toList);
+  ClearAggregateHeader (m_ccList);
+  m_headers.ResetWritePos();
+  m_envelope.ResetWritePos();
+  m_receivedTime = 0;
+  m_receivedValue.Truncate();
+  for (uint32_t i = 0; i < m_customDBHeaders.Length(); i++)
+    m_customDBHeaderValues[i].length = 0;
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsParseMailMessageState::SetState(nsMailboxParseState aState)
+{
+  m_state = aState;
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsParseMailMessageState::GetState(nsMailboxParseState *aState)
+{
+  if (!aState)
+    return NS_ERROR_NULL_POINTER;
+
+  *aState = m_state;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsParseMailMessageState::GetEnvelopePos(uint64_t *aEnvelopePos)
+{
+  NS_ENSURE_ARG_POINTER(aEnvelopePos);
+
+  *aEnvelopePos = m_envelope_pos;
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsParseMailMessageState::SetEnvelopePos(uint64_t aEnvelopePos)
+{
+  m_envelope_pos = aEnvelopePos;
+  m_position = m_envelope_pos;
+  m_headerstartpos = m_position;
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsParseMailMessageState::GetNewMsgHdr(nsIMsgDBHdr ** aMsgHeader)
+{
+  NS_ENSURE_ARG_POINTER(aMsgHeader);
+  NS_IF_ADDREF(*aMsgHeader = m_newMsgHdr);
+  return m_newMsgHdr ? NS_OK : NS_ERROR_NULL_POINTER;
+}
+
+NS_IMETHODIMP nsParseMailMessageState::SetNewMsgHdr(nsIMsgDBHdr *aMsgHeader)
+{
+  m_newMsgHdr = aMsgHeader;
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsParseMailMessageState::ParseAFolderLine(const char *line, uint32_t lineLength)
+{
+  ParseFolderLine(line, lineLength);
+  return NS_OK;
+}
+
+nsresult nsParseMailMessageState::ParseFolderLine(const char *line, uint32_t lineLength)
+{
+  nsresult rv;
+
+  if (m_state == nsIMsgParseMailMsgState::ParseHeadersState)
+  {
+    if (EMPTY_MESSAGE_LINE(line))
+    {
+      /* End of headers.  Now parse them. */
+      rv = ParseHeaders();
+      NS_ASSERTION(NS_SUCCEEDED(rv), "error parsing headers parsing mailbox");
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      rv = FinalizeHeaders();
+      NS_ASSERTION(NS_SUCCEEDED(rv), "error finalizing headers parsing mailbox");
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      m_state = nsIMsgParseMailMsgState::ParseBodyState;
+    }
+    else
+    {
+      /* Otherwise, this line belongs to a header.  So append it to the
+         header data, and stay in MBOX `MIME_PARSE_HEADERS' state.
+      */
+      m_headers.AppendBuffer(line, lineLength);
+    }
+  }
+  else if ( m_state == nsIMsgParseMailMsgState::ParseBodyState)
+  {
+    m_body_lines++;
+  }
+
+  m_position += lineLength;
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsParseMailMessageState::SetMailDB(nsIMsgDatabase *mailDB)
+{
+  m_mailDB = mailDB;
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsParseMailMessageState::SetBackupMailDB(nsIMsgDatabase *aBackupMailDB)
+{
+  m_backupMailDB = aBackupMailDB;
+  if (m_backupMailDB)
+    m_backupMailDB->AddListener(this);
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsParseMailMessageState::SetNewKey(nsMsgKey aKey)
+{
+  m_new_key = aKey;
+  return NS_OK;
+}
+
+/* #define STRICT_ENVELOPE */
+
+bool
+nsParseMailMessageState::IsEnvelopeLine(const char *buf, int32_t buf_size)
+{
+#ifdef STRICT_ENVELOPE
+  /* The required format is
+     From jwz  Fri Jul  1 09:13:09 1994
+   But we should also allow at least:
+     From jwz  Fri, Jul 01 09:13:09 1994
+     From jwz  Fri Jul  1 09:13:09 1994 PST
+     From jwz  Fri Jul  1 09:13:09 1994 (+0700)
+
+   We can't easily call XP_ParseTimeString() because the string is not
+   null terminated (ok, we could copy it after a quick check...) but
+   XP_ParseTimeString() may be too lenient for our purposes.
+
+   DANGER!!  The released version of 2.0b1 was (on some systems,
+   some Unix, some NT, possibly others) writing out envelope lines
+   like "From - 10/13/95 11:22:33" which STRICT_ENVELOPE will reject!
+   */
+  const char *date, *end;
+
+  if (buf_size < 29) return false;
+  if (*buf != 'F') return false;
+  if (strncmp(buf, "From ", 5)) return false;
+
+  end = buf + buf_size;
+  date = buf + 5;
+
+  /* Skip horizontal whitespace between "From " and user name. */
+  while ((*date == ' ' || *date == '\t') && date < end)
+  date++;
+
+  /* If at the end, it doesn't match. */
+  if (IS_SPACE(*date) || date == end)
+  return false;
+
+  /* Skip over user name. */
+  while (!IS_SPACE(*date) && date < end)
+  date++;
+
+  /* Skip horizontal whitespace between user name and date. */
+  while ((*date == ' ' || *date == '\t') && date < end)
+  date++;
+
+  /* Don't want this to be localized. */
+# define TMP_ISALPHA(x) (((x) >= 'A' && (x) <= 'Z') || \
+             ((x) >= 'a' && (x) <= 'z'))
+
+  /* take off day-of-the-week. */
+  if (date >= end - 3)
+  return false;
+  if (!TMP_ISALPHA(date[0]) || !TMP_ISALPHA(date[1]) || !TMP_ISALPHA(date[2]))
+  return false;
+  date += 3;
+  /* Skip horizontal whitespace (and commas) between dotw and month. */
+  if (*date != ' ' && *date != '\t' && *date != ',')
+  return false;
+  while ((*date == ' ' || *date == '\t' || *date == ',') && date < end)
+  date++;
+
+  /* take off month. */
+  if (date >= end - 3)
+  return false;
+  if (!TMP_ISALPHA(date[0]) || !TMP_ISALPHA(date[1]) || !TMP_ISALPHA(date[2]))
+  return false;
+  date += 3;
+  /* Skip horizontal whitespace between month and dotm. */
+  if (date == end || (*date != ' ' && *date != '\t'))
+  return false;
+  while ((*date == ' ' || *date == '\t') && date < end)
+  date++;
+
+  /* Skip over digits and whitespace. */
+  while (((*date >= '0' && *date <= '9') || *date == ' ' || *date == '\t') &&
+     date < end)
+  date++;
+  /* Next character should be a colon. */
+  if (date >= end || *date != ':')
+  return false;
+
+  /* Ok, that ought to be enough... */
+
+# undef TMP_ISALPHA
+
+#else  /* !STRICT_ENVELOPE */
+
+  if (buf_size < 5) return false;
+  if (*buf != 'F') return false;
+  if (strncmp(buf, "From ", 5)) return false;
+
+#endif /* !STRICT_ENVELOPE */
+
+  return true;
+}
+
+// We've found the start of the next message, so finish this one off.
+NS_IMETHODIMP nsParseMailMessageState::FinishHeader()
+{
+  if (m_newMsgHdr)
+  {
+    m_newMsgHdr->SetMessageOffset(m_envelope_pos);
+    m_newMsgHdr->SetMessageSize(m_position - m_envelope_pos);
+    m_newMsgHdr->SetLineCount(m_body_lines);
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsParseMailMessageState::GetAllHeaders(char ** pHeaders, int32_t *pHeadersSize)
+{
+  if (!pHeaders || !pHeadersSize)
+    return NS_ERROR_NULL_POINTER;
+  *pHeaders = m_headers.GetBuffer();
+  *pHeadersSize = m_headers.GetBufferPos();
+  return NS_OK;
+}
+
+// generate headers as a string, with CRLF between the headers
+NS_IMETHODIMP nsParseMailMessageState::GetHeaders(char ** pHeaders)
+{
+  NS_ENSURE_ARG_POINTER(pHeaders);
+  nsCString crlfHeaders;
+  char *curHeader = m_headers.GetBuffer();
+  for (uint32_t headerPos = 0; headerPos < m_headers.GetBufferPos();)
+  {
+    crlfHeaders.Append(curHeader);
+    crlfHeaders.Append(CRLF);
+    int32_t headerLen = strlen(curHeader);
+    curHeader += headerLen + 1;
+    headerPos += headerLen + 1;
+  }
+  *pHeaders = ToNewCString(crlfHeaders);
+  return NS_OK;
+}
+
+struct message_header *nsParseMailMessageState::GetNextHeaderInAggregate (nsTArray<struct message_header*> &list)
+{
+  // When parsing a message with multiple To or CC header lines, we're storing each line in a
+  // list, where the list represents the "aggregate" total of all the header. Here we get a new
+  // line for the list
+
+  struct message_header *header = (struct message_header*) PR_Calloc (1, sizeof(struct message_header));
+  list.AppendElement (header);
+  return header;
+}
+
+void nsParseMailMessageState::GetAggregateHeader (nsTArray<struct message_header*> &list, struct message_header *outHeader)
+{
+  // When parsing a message with multiple To or CC header lines, we're storing each line in a
+  // list, where the list represents the "aggregate" total of all the header. Here we combine
+  // all the lines together, as though they were really all found on the same line
+
+  struct message_header *header = nullptr;
+  int length = 0;
+  size_t i;
+
+  // Count up the bytes required to allocate the aggregated header
+  for (i = 0; i < list.Length(); i++)
+  {
+    header = list.ElementAt(i);
+    length += (header->length + 1); //+ for ","
+  }
+
+  if (length > 0)
+  {
+    char *value = (char*) PR_CALLOC (length + 1); //+1 for null term
+    if (value)
+    {
+      // Catenate all the To lines together, separated by commas
+      value[0] = '\0';
+      size_t size = list.Length();
+      for (i = 0; i < size; i++)
+      {
+        header = list.ElementAt(i);
+        PL_strncat (value, header->value, header->length);
+        if (i + 1 < size)
+          PL_strcat (value, ",");
+      }
+      outHeader->length = length;
+      outHeader->value = value;
+    }
+  }
+  else
+  {
+    outHeader->length = 0;
+    outHeader->value = nullptr;
+  }
+}
+
+void nsParseMailMessageState::ClearAggregateHeader (nsTArray<struct message_header*> &list)
+{
+  // Reset the aggregate headers. Free only the message_header struct since
+  // we don't own the value pointer
+
+  for (size_t i = 0; i < list.Length(); i++)
+    PR_Free (list.ElementAt(i));
+  list.Clear();
+}
+
+// We've found a new envelope to parse.
+nsresult nsParseMailMessageState::StartNewEnvelope(const char *line, uint32_t lineLength)
+{
+  m_envelope_pos = m_position;
+  m_state = nsIMsgParseMailMsgState::ParseHeadersState;
+  m_position += lineLength;
+  m_headerstartpos = m_position;
+  return ParseEnvelope (line, lineLength);
+}
+
+/* largely lifted from mimehtml.c, which does similar parsing, sigh...
+*/
+nsresult nsParseMailMessageState::ParseHeaders ()
+{
+  char *buf = m_headers.GetBuffer();
+  uint32_t buf_length = m_headers.GetBufferPos();
+  if (buf_length == 0)
+  {
+    // No header of an expected type is present. Consider this a successful
+    // parse so email still shows on summary and can be accessed and deleted.
+    return NS_OK;
+  }
+  char *buf_end = buf + buf_length;
+  if (!(buf_length > 1 && (buf[buf_length - 1] == '\r' ||
+        buf[buf_length - 1] == '\n')))
+  {
+    NS_WARNING("Header text should always end in a newline");
+    return NS_ERROR_UNEXPECTED;
+  }
+  while (buf < buf_end)
+  {
+    char *colon = PL_strnchr(buf, ':', buf_end - buf);
+    char *end;
+    char *value = 0;
+    struct message_header *header = 0;
+    struct message_header receivedBy;
+
+    if (!colon)
+      break;
+
+    end = colon;
+
+    switch (buf [0])
+    {
+    case 'B': case 'b':
+      if (!PL_strncasecmp ("BCC", buf, end - buf))
+        header = &m_bccList;
+      break;
+    case 'C': case 'c':
+      if (!PL_strncasecmp ("CC", buf, end - buf))
+        header = GetNextHeaderInAggregate(m_ccList);
+      else if (!PL_strncasecmp ("Content-Type", buf, end - buf))
+        header = &m_content_type;
+      break;
+    case 'D': case 'd':
+      if (!PL_strncasecmp ("Date", buf, end - buf))
+        header = &m_date;
+      else if (!PL_strncasecmp("Disposition-Notification-To", buf, end - buf))
+        header = &m_mdn_dnt;
+      else if (!PL_strncasecmp("Delivery-date", buf, end - buf))
+        header = &m_delivery_date;
+      break;
+    case 'F': case 'f':
+      if (!PL_strncasecmp ("From", buf, end - buf))
+        header = &m_from;
+      break;
+    case 'I' : case 'i':
+      if (!PL_strncasecmp ("In-Reply-To", buf, end - buf))
+        header = &m_in_reply_to;
+      break;
+    case 'M': case 'm':
+      if (!PL_strncasecmp ("Message-ID", buf, end - buf))
+        header = &m_message_id;
+      break;
+    case 'N': case 'n':
+      if (!PL_strncasecmp ("Newsgroups", buf, end - buf))
+        header = &m_newsgroups;
+      break;
+    case 'O': case 'o':
+      if (!PL_strncasecmp ("Original-Recipient", buf, end - buf))
+        header = &m_mdn_original_recipient;
+      break;
+    case 'R': case 'r':
+      if (!PL_strncasecmp ("References", buf, end - buf))
+        header = &m_references;
+      else if (!PL_strncasecmp ("Return-Path", buf, end - buf))
+        header = &m_return_path;
+      // treat conventional Return-Receipt-To as MDN
+      // Disposition-Notification-To
+      else if (!PL_strncasecmp ("Return-Receipt-To", buf, end - buf))
+        header = &m_mdn_dnt;
+      else if (!PL_strncasecmp("Reply-To", buf, end - buf))
+        header = &m_replyTo;
+      else if (!PL_strncasecmp("Received", buf, end - buf))
+      {
+        header = &receivedBy;
+        header->length = 0;
+      }
+      break;
+    case 'S': case 's':
+      if (!PL_strncasecmp ("Subject", buf, end - buf) && !m_subject.length)
+        header = &m_subject;
+      else if (!PL_strncasecmp ("Sender", buf, end - buf))
+        header = &m_sender;
+      else if (!PL_strncasecmp ("Status", buf, end - buf))
+        header = &m_status;
+      break;
+    case 'T': case 't':
+      if (!PL_strncasecmp ("To", buf, end - buf))
+        header = GetNextHeaderInAggregate(m_toList);
+      break;
+    case 'X':
+      if (X_MOZILLA_STATUS2_LEN == end - buf &&
+        !PL_strncasecmp(X_MOZILLA_STATUS2, buf, end - buf) &&
+        !m_IgnoreXMozillaStatus && !m_mozstatus2.length)
+        header = &m_mozstatus2;
+      else if ( X_MOZILLA_STATUS_LEN == end - buf &&
+        !PL_strncasecmp(X_MOZILLA_STATUS, buf, end - buf) && !m_IgnoreXMozillaStatus
+        && !m_mozstatus.length)
+        header = &m_mozstatus;
+      else if (!PL_strncasecmp(HEADER_X_MOZILLA_ACCOUNT_KEY, buf, end - buf)
+        && !m_account_key.length)
+        header = &m_account_key;
+      // we could very well care what the priority header was when we
+      // remember its value. If so, need to remember it here. Also,
+      // different priority headers can appear in the same message,
+      // but we only rememeber the last one that we see.
+      else if (!PL_strncasecmp("X-Priority", buf, end - buf)
+        || !PL_strncasecmp("Priority", buf, end - buf))
+        header = &m_priority;
+      else if (!PL_strncasecmp(HEADER_X_MOZILLA_KEYWORDS, buf, end - buf)
+        && !m_keywords.length)
+        header = &m_keywords;
+      break;
+    }
+    if (!header && m_customDBHeaders.Length())
+    {
+#ifdef MOZILLA_INTERNAL_API
+      nsDependentCSubstring headerStr(buf, end);
+#else
+      nsDependentCSubstring headerStr(buf, end - buf);
+#endif
+
+      ToLowerCase(headerStr);
+      size_t customHeaderIndex = m_customDBHeaders.IndexOf(headerStr);
+      if (customHeaderIndex != m_customDBHeaders.NoIndex)
+        header = & m_customDBHeaderValues[customHeaderIndex];
+    }
+
+    buf = colon + 1;
+    uint32_t writeOffset = 0; // number of characters replaced with a folded space
+
+SEARCH_NEWLINE:
+    // move past any non terminating characters, rewriting them if folding white space
+    // exists
+    while (buf < buf_end && *buf != '\r' && *buf != '\n')
+    {
+      if (writeOffset)
+        *(buf - writeOffset) = *buf;
+      buf++;
+    }
+
+    /* If "\r\n " or "\r\n\t" is next, that doesn't terminate the header. */
+    if ((buf + 2 < buf_end && (buf[0] == '\r' && buf[1] == '\n') &&
+                              (buf[2] == ' ' || buf[2] == '\t')) ||
+    /* If "\r " or "\r\t" or "\n " or "\n\t" is next, that doesn't terminate
+       the header either. */
+        (buf + 1 < buf_end && (buf[0] == '\r' || buf[0] == '\n') &&
+                              (buf[1] == ' ' || buf[1] == '\t')))
+    {
+      // locate the proper location for a folded space by eliminating any
+      // leading spaces before the end-of-line character
+      char* foldedSpace = buf;
+      while (*(foldedSpace - 1) == ' ' || *(foldedSpace - 1) == '\t')
+        foldedSpace--;
+
+      // put a single folded space character
+      *(foldedSpace - writeOffset) = ' ';
+      writeOffset += (buf - foldedSpace);
+      buf++;
+
+      // eliminate any additional white space
+      while (buf < buf_end &&
+              (*buf == '\n' || *buf == '\r' || *buf == ' ' || *buf == '\t'))
+      {
+        buf++;
+        writeOffset++;
+      }
+
+      // If we get here, the message headers ended in an empty line, like:
+      // To: blah blah blah<CR><LF>  <CR><LF>[end of buffer]. The code below
+      // requires buf to land on a newline to properly null-terminate the
+      // string, so back up a tad so that it is pointing to one.
+      if (buf == buf_end)
+      {
+        --buf;
+        MOZ_ASSERT(*buf == '\n' || *buf == '\r',
+          "Header text should always end in a newline.");
+      }
+      goto SEARCH_NEWLINE;
+    }
+
+    if (header)
+    {
+      value = colon + 1;
+      // eliminate trailing blanks after the colon
+      while (value < (buf - writeOffset) && (*value == ' ' || *value == '\t'))
+        value++;
+
+      header->value = value;
+      header->length = buf - header->value - writeOffset;
+      if (header->length < 0)
+        header->length = 0;
+    }
+    if (*buf == '\r' || *buf == '\n')
+    {
+      char *last = buf - writeOffset;
+      char *saveBuf = buf;
+      if (*buf == '\r' && buf + 1 < buf_end && buf[1] == '\n')
+        buf++;
+      buf++;
+      // null terminate the left-over slop so we don't confuse msg filters.
+      *saveBuf = 0;
+      *last = 0;  /* short-circuit const, and null-terminate header. */
+    }
+
+    if (header)
+    {
+      /* More const short-circuitry... */
+      /* strip trailing whitespace */
+      while (header->length > 0 &&
+        IS_SPACE (header->value [header->length - 1]))
+        ((char *) header->value) [--header->length] = 0;
+      if (header == &receivedBy)
+      {
+        if (m_receivedTime == 0)
+        {
+          // parse Received: header for date.
+          // We trust the first header as that is closest to recipient,
+          // and less likely to be spoofed.
+          nsAutoCString receivedHdr(header->value, header->length);
+          int32_t lastSemicolon = receivedHdr.RFindChar(';');
+          if (lastSemicolon != -1)
+          {
+            nsAutoCString receivedDate;
+            receivedDate = Substring(receivedHdr, lastSemicolon + 1);
+            receivedDate.Trim(" \t\b\r\n");
+            PRTime resultTime;
+            if (PR_ParseTimeString (receivedDate.get(), false, &resultTime) == PR_SUCCESS)
+              m_receivedTime = resultTime;
+            else
+              NS_WARNING("PR_ParseTimeString failed in ParseHeaders().");
+          }
+        }
+        // Someone might want the received header saved.
+        if (m_customDBHeaders.Length())
+        {
+          if (m_customDBHeaders.Contains(NS_LITERAL_CSTRING("received")))
+          {
+            if (!m_receivedValue.IsEmpty())
+              m_receivedValue.Append(' ');
+            m_receivedValue.Append(header->value, header->length);
+          }
+        }
+      }
+
+      MOZ_ASSERT(header->value[header->length] == 0,
+        "Non-null-terminated strings cause very, very bad problems");
+    }
+  }
+  return NS_OK;
+}
+
+nsresult nsParseMailMessageState::ParseEnvelope (const char *line, uint32_t line_size)
+{
+  const char *end;
+  char *s;
+
+  m_envelope.AppendBuffer(line, line_size);
+  end = m_envelope.GetBuffer() + line_size;
+  s = m_envelope.GetBuffer() + 5;
+
+  while (s < end && IS_SPACE (*s))
+    s++;
+  m_envelope_from.value = s;
+  while (s < end && !IS_SPACE (*s))
+    s++;
+  m_envelope_from.length = s - m_envelope_from.value;
+
+  while (s < end && IS_SPACE (*s))
+    s++;
+  m_envelope_date.value = s;
+  m_envelope_date.length = (uint16_t) (line_size - (s - m_envelope.GetBuffer()));
+
+  while (m_envelope_date.length > 0 &&
+         IS_SPACE (m_envelope_date.value [m_envelope_date.length - 1]))
+    m_envelope_date.length--;
+
+  /* #### short-circuit const */
+  ((char *) m_envelope_from.value) [m_envelope_from.length] = 0;
+  ((char *) m_envelope_date.value) [m_envelope_date.length] = 0;
+
+  return NS_OK;
+}
+
+nsresult nsParseMailMessageState::InternSubject (struct message_header *header)
+{
+  if (!header || header->length == 0)
+  {
+    m_newMsgHdr->SetSubject("");
+    return NS_OK;
+  }
+
+  const char *key = header->value;
+
+  uint32_t flags;
+  (void)m_newMsgHdr->GetFlags(&flags);
+  /* strip "Re: " */
+  /**
+        We trust the X-Mozilla-Status line to be the smartest in almost
+        all things.  One exception, however, is the HAS_RE flag.  Since
+         we just parsed the subject header anyway, we expect that parsing
+         to be smartest.  (After all, what if someone just went in and
+        edited the subject line by hand?)
+     */
+  nsCString modifiedSubject;
+  if (NS_MsgStripRE(nsDependentCString(key), modifiedSubject))
+    flags |= nsMsgMessageFlags::HasRe;
+  else
+    flags &= ~nsMsgMessageFlags::HasRe;
+  m_newMsgHdr->SetFlags(flags); // this *does not* update the mozilla-status header in the local folder
+
+  // Condense the subject text into as few MIME-2 encoded words as possible.
+  m_newMsgHdr->SetSubject(modifiedSubject.IsEmpty() ? key : modifiedSubject.get());
+
+  return NS_OK;
+}
+
+// we've reached the end of the envelope, and need to turn all our accumulated message_headers
+// into a single nsIMsgDBHdr to store in a database.
+nsresult nsParseMailMessageState::FinalizeHeaders()
+{
+  nsresult rv;
+  struct message_header *sender;
+  struct message_header *recipient;
+  struct message_header *subject;
+  struct message_header *id;
+  struct message_header *inReplyTo;
+  struct message_header *replyTo;
+  struct message_header *references;
+  struct message_header *date;
+  struct message_header *deliveryDate;
+  struct message_header *statush;
+  struct message_header *mozstatus;
+  struct message_header *mozstatus2;
+  struct message_header *priority;
+  struct message_header *keywords;
+  struct message_header *account_key;
+  struct message_header *ccList;
+  struct message_header *bccList;
+  struct message_header *mdn_dnt;
+  struct message_header md5_header;
+  struct message_header *content_type;
+  char md5_data [50];
+
+  uint32_t flags = 0;
+  uint32_t delta = 0;
+  nsMsgPriorityValue priorityFlags = nsMsgPriority::notSet;
+  uint32_t labelFlags = 0;
+
+  if (!m_mailDB)    // if we don't have a valid db, skip the header.
+    return NS_OK;
+
+  struct message_header to;
+  GetAggregateHeader (m_toList, &to);
+  struct message_header cc;
+  GetAggregateHeader (m_ccList, &cc);
+  // we don't aggregate bcc, as we only generate it locally,
+  // and we don't use multiple lines
+
+  sender     = (m_from.length          ? &m_from :
+  m_sender.length        ? &m_sender :
+  m_envelope_from.length ? &m_envelope_from :
+  0);
+  recipient  = (to.length         ? &to :
+  cc.length         ? &cc :
+  m_newsgroups.length ? &m_newsgroups :
+  0);
+  ccList     = (cc.length ? &cc : 0);
+  bccList    = (m_bccList.length    ? &m_bccList    : 0);
+  subject    = (m_subject.length    ? &m_subject    : 0);
+  id         = (m_message_id.length ? &m_message_id : 0);
+  references = (m_references.length ? &m_references : 0);
+  statush    = (m_status.length     ? &m_status     : 0);
+  mozstatus  = (m_mozstatus.length  ? &m_mozstatus  : 0);
+  mozstatus2 = (m_mozstatus2.length  ? &m_mozstatus2  : 0);
+  date       = (m_date.length       ? &m_date :
+  m_envelope_date.length ? &m_envelope_date :
+  0);
+  deliveryDate = (m_delivery_date.length ? &m_delivery_date : 0);
+  priority   = (m_priority.length   ? &m_priority   : 0);
+  keywords   =  (m_keywords.length   ? &m_keywords  : 0);
+  mdn_dnt     = (m_mdn_dnt.length    ? &m_mdn_dnt    : 0);
+  inReplyTo = (m_in_reply_to.length ? &m_in_reply_to : 0);
+  replyTo = (m_replyTo.length ? &m_replyTo : 0);
+  content_type = (m_content_type.length ? &m_content_type : 0);
+  account_key = (m_account_key.length ? &m_account_key :0);
+
+  if (mozstatus)
+  {
+    if (mozstatus->length == 4)
+    {
+      NS_ASSERTION(MsgIsHex(mozstatus->value, 4), "Expected 4 hex digits for flags.");
+      flags = MsgUnhex(mozstatus->value, 4);
+      // strip off and remember priority bits.
+      flags &= ~nsMsgMessageFlags::RuntimeOnly;
+      priorityFlags = (nsMsgPriorityValue) ((flags & nsMsgMessageFlags::Priorities) >> 13);
+      flags &= ~nsMsgMessageFlags::Priorities;
+    }
+    delta = (m_headerstartpos +
+      (mozstatus->value - m_headers.GetBuffer()) -
+      (2 + X_MOZILLA_STATUS_LEN)    /* 2 extra bytes for ": ". */
+      ) - m_envelope_pos;
+  }
+
+  if (mozstatus2)
+  {
+    uint32_t flags2 = 0;
+    sscanf(mozstatus2->value, " %x ", &flags2);
+    flags |= flags2;
+  }
+
+  if (!(flags & nsMsgMessageFlags::Expunged))  // message was deleted, don't bother creating a hdr.
+  {
+    // We'll need the message id first to recover data from the backup database
+    nsAutoCString rawMsgId;
+    /* Take off <> around message ID. */
+    if (id)
+    {
+      if (id->length > 0 && id->value[0] == '<')
+        id->length--, id->value++;
+
+      NS_WARNING_ASSERTION(id->length > 0, "id->length failure in FinalizeHeaders().");
+
+      if (id->length > 0 && id->value[id->length - 1] == '>')
+        /* generate a new null-terminated string without the final > */
+        rawMsgId.Assign(id->value, id->length - 1);
+      else
+        rawMsgId.Assign(id->value);
+    }
+
+    /*
+     * Try to copy the data from the backup database, referencing the MessageID
+     * If that fails, just create a new header
+     */
+    nsCOMPtr<nsIMsgDBHdr> oldHeader;
+    nsresult ret = NS_OK;
+
+    if (m_backupMailDB && !rawMsgId.IsEmpty())
+      ret = m_backupMailDB->GetMsgHdrForMessageID(
+              rawMsgId.get(), getter_AddRefs(oldHeader));
+
+    // m_new_key is set in nsImapMailFolder::ParseAdoptedHeaderLine to be
+    // the UID of the message, so that the key can get created as UID. That of
+    // course is extremely confusing, and we really need to clean that up. We
+    // really should not conflate the meaning of envelope position, key, and
+    // UID.
+    if (NS_SUCCEEDED(ret) && oldHeader)
+        ret = m_mailDB->CopyHdrFromExistingHdr(m_new_key,
+                oldHeader, false, getter_AddRefs(m_newMsgHdr));
+    else if (!m_newMsgHdr)
+    {
+      // Should assert that this is not a local message
+      ret = m_mailDB->CreateNewHdr(m_new_key, getter_AddRefs(m_newMsgHdr));
+    }
+
+    if (NS_SUCCEEDED(ret) && m_newMsgHdr)
+    {
+      uint32_t origFlags;
+      (void)m_newMsgHdr->GetFlags(&origFlags);
+      if (origFlags & nsMsgMessageFlags::HasRe)
+        flags |= nsMsgMessageFlags::HasRe;
+      else
+        flags &= ~nsMsgMessageFlags::HasRe;
+
+      flags &= ~nsMsgMessageFlags::Offline; // don't keep nsMsgMessageFlags::Offline for local msgs
+      if (mdn_dnt && !(origFlags & nsMsgMessageFlags::Read) &&
+          !(origFlags & nsMsgMessageFlags::MDNReportSent) &&
+          !(flags & nsMsgMessageFlags::MDNReportSent))
+        flags |= nsMsgMessageFlags::MDNReportNeeded;
+
+      m_newMsgHdr->SetFlags(flags);
+      if (priorityFlags != nsMsgPriority::notSet)
+        m_newMsgHdr->SetPriority(priorityFlags);
+
+      // if we have a reply to header, and it's different from the from: header,
+      // set the "replyTo" attribute on the msg hdr.
+      if (replyTo && (!sender || replyTo->length != sender->length || strncmp(replyTo->value, sender->value, sender->length)))
+        m_newMsgHdr->SetStringProperty("replyTo", replyTo->value);
+      // convert the flag values (0xE000000) to label values (0-5)
+      if (mozstatus2) // only do this if we have a mozstatus2 header
+      {
+        labelFlags = ((flags & nsMsgMessageFlags::Labels) >> 25);
+        m_newMsgHdr->SetLabel(labelFlags);
+      }
+      if (delta < 0xffff)
+      {    /* Only use if fits in 16 bits. */
+        m_newMsgHdr->SetStatusOffset((uint16_t) delta);
+        if (!m_IgnoreXMozillaStatus) {  // imap doesn't care about X-MozillaStatus
+          uint32_t offset;
+          (void)m_newMsgHdr->GetStatusOffset(&offset);
+          NS_ASSERTION(offset < 10000, "invalid status offset"); /* ### Debugging hack */
+        }
+      }
+      if (sender)
+        m_newMsgHdr->SetAuthor(sender->value);
+      if (recipient == &m_newsgroups)
+      {
+      /* In the case where the recipient is a newsgroup, truncate the string
+      at the first comma.  This is used only for presenting the thread list,
+      and newsgroup lines tend to be long and non-shared, and tend to bloat
+      the string table.  So, by only showing the first newsgroup, we can
+      reduce memory and file usage at the expense of only showing the one
+      group in the summary list, and only being able to sort on the first
+        group rather than the whole list.  It's worth it. */
+        char * ch;
+        ch = PL_strchr(recipient->value, ',');
+        if (ch)
+        {
+          /* generate a new string that terminates before the , */
+          nsAutoCString firstGroup;
+          firstGroup.Assign(recipient->value, ch - recipient->value);
+          m_newMsgHdr->SetRecipients(firstGroup.get());
+        }
+        m_newMsgHdr->SetRecipients(recipient->value);
+      }
+      else if (recipient)
+      {
+        m_newMsgHdr->SetRecipients(recipient->value);
+      }
+      if (ccList)
+      {
+        m_newMsgHdr->SetCcList(ccList->value);
+      }
+
+      if (bccList)
+      {
+        m_newMsgHdr->SetBccList(bccList->value);
+      }
+
+      rv = InternSubject (subject);
+      if (NS_SUCCEEDED(rv))
+      {
+        if (!id)
+        {
+          // what to do about this? we used to do a hash of all the headers...
+          nsAutoCString hash;
+          const char *md5_b64 = "dummy.message.id";
+          nsresult rv;
+          nsCOMPtr<nsICryptoHash> hasher = do_CreateInstance("@mozilla.org/security/hash;1", &rv);
+          if (NS_SUCCEEDED(rv))
+          {
+            if (NS_SUCCEEDED(hasher->Init(nsICryptoHash::MD5)) &&
+                NS_SUCCEEDED(hasher->Update((const uint8_t*) m_headers.GetBuffer(), m_headers.GetSize())) &&
+                NS_SUCCEEDED(hasher->Finish(true, hash)))
+              md5_b64 = hash.get();
+          }
+          PR_snprintf (md5_data, sizeof(md5_data), "<md5:%s>", md5_b64);
+          md5_header.value = md5_data;
+          md5_header.length = strlen(md5_data);
+          id = &md5_header;
+        }
+
+        if (!rawMsgId.IsEmpty())
+          m_newMsgHdr->SetMessageId(rawMsgId.get());
+        else
+          m_newMsgHdr->SetMessageId(id->value);
+        m_mailDB->UpdatePendingAttributes(m_newMsgHdr);
+
+        if (!mozstatus && statush)
+        {
+          /* Parse a little bit of the Berkeley Mail status header. */
+          for (const char *s = statush->value; *s; s++) {
+            uint32_t msgFlags = 0;
+            (void)m_newMsgHdr->GetFlags(&msgFlags);
+            switch (*s)
+            {
+            case 'R': case 'r':
+              m_newMsgHdr->SetFlags(msgFlags | nsMsgMessageFlags::Read);
+              break;
+            case 'D': case 'd':
+              /* msg->flags |= nsMsgMessageFlags::Expunged;  ### Is this reasonable? */
+              break;
+            case 'N': case 'n':
+            case 'U': case 'u':
+              m_newMsgHdr->SetFlags(msgFlags & ~nsMsgMessageFlags::Read);
+              break;
+            default:            // Should check for corrupt file.
+              NS_ERROR("Corrupt file. Should not happen.");
+              break;
+            }
+          }
+        }
+
+        if (account_key != nullptr)
+          m_newMsgHdr->SetAccountKey(account_key->value);
+        // use in-reply-to header as references, if there's no references header
+        if (references != nullptr)
+          m_newMsgHdr->SetReferences(references->value);
+        else if (inReplyTo != nullptr)
+          m_newMsgHdr->SetReferences(inReplyTo->value);
+
+        // 'Received' should be as reliable an indicator of the receipt
+        // date+time as possible, whilst always giving something *from
+        // the message*.  It won't use PR_Now() under any circumstance.
+        // Therefore, the fall-thru order for 'Received' is:
+        // Received: -> Delivery-date: -> date
+        // 'Date' uses:
+        // date -> PR_Now()
+        //
+        // date is:
+        // Date: -> m_envelope_date
+
+        uint32_t rcvTimeSecs = 0;
+        if (date)
+        {  // Date:
+          PRTime resultTime;
+          PRStatus timeStatus = PR_ParseTimeString (date->value, false, &resultTime);
+          if (PR_SUCCESS == timeStatus)
+          {
+            m_newMsgHdr->SetDate(resultTime);
+            PRTime2Seconds(resultTime, &rcvTimeSecs);
+          }
+          else
+            NS_WARNING("PR_ParseTimeString of date failed in FinalizeHeader().");
+        }
+        else
+        {  // PR_Now()
+          // If there was some problem parsing the Date header *AND* we
+          // couldn't get a valid envelope date, use now as the time.
+          // PR_ParseTimeString won't touch resultTime unless it succeeds.
+          // This doesn't affect local (POP3) messages, because we use the envelope
+          // date if there's no Date: header, but it will affect IMAP msgs
+          // w/o a Date: hdr or Received: headers.
+          PRTime resultTime = PR_Now();
+          m_newMsgHdr->SetDate(resultTime);
+        }
+        if (m_receivedTime != 0)
+        {  // Upgrade 'Received' to Received: ?
+          PRTime2Seconds(m_receivedTime, &rcvTimeSecs);
+        }
+        else if (deliveryDate)
+        {  // Upgrade 'Received' to Delivery-date: ?
+          PRTime resultTime;
+          PRStatus timeStatus = PR_ParseTimeString (deliveryDate->value, false, &resultTime);
+          if (PR_SUCCESS == timeStatus)
+            PRTime2Seconds(resultTime, &rcvTimeSecs);
+          else // TODO/FIXME: We need to figure out what to do in this case!
+            NS_WARNING("PR_ParseTimeString of delivery date failed in FinalizeHeader().");
+        }
+        m_newMsgHdr->SetUint32Property("dateReceived", rcvTimeSecs);
+
+        if (priority)
+          m_newMsgHdr->SetPriorityString(priority->value);
+        else if (priorityFlags == nsMsgPriority::notSet)
+          m_newMsgHdr->SetPriority(nsMsgPriority::none);
+        if (keywords)
+        {
+          // When there are many keywords, some may not have been written
+          // to the message file, so add extra keywords from the backup
+          nsAutoCString oldKeywords;
+          m_newMsgHdr->GetStringProperty("keywords", getter_Copies(oldKeywords));
+          nsTArray<nsCString> newKeywordArray, oldKeywordArray;
+          ParseString(Substring(keywords->value, keywords->value + keywords->length), ' ', newKeywordArray);
+          ParseString(oldKeywords, ' ', oldKeywordArray);
+          for (uint32_t i = 0; i < oldKeywordArray.Length(); i++)
+            if (!newKeywordArray.Contains(oldKeywordArray[i]))
+              newKeywordArray.AppendElement(oldKeywordArray[i]);
+          nsAutoCString newKeywords;
+          for (uint32_t i = 0; i < newKeywordArray.Length(); i++)
+          {
+            if (i)
+              newKeywords.Append(" ");
+            newKeywords.Append(newKeywordArray[i]);
+          }
+          m_newMsgHdr->SetStringProperty("keywords", newKeywords.get());
+        }
+        for (uint32_t i = 0; i < m_customDBHeaders.Length(); i++)
+        {
+          if (m_customDBHeaderValues[i].length)
+            m_newMsgHdr->SetStringProperty(m_customDBHeaders[i].get(), m_customDBHeaderValues[i].value);
+          // The received header is accumulated separately
+          if (m_customDBHeaders[i].EqualsLiteral("received") && !m_receivedValue.IsEmpty())
+            m_newMsgHdr->SetStringProperty("received", m_receivedValue.get());
+        }
+        if (content_type)
+        {
+          char *substring = PL_strstr(content_type->value, "charset");
+          if (substring)
+          {
+            char *charset = PL_strchr (substring, '=');
+            if (charset)
+            {
+              charset++;
+              /* strip leading whitespace and double-quote */
+              while (*charset && (IS_SPACE (*charset) || '\"' == *charset))
+                charset++;
+              /* strip trailing whitespace and double-quote */
+              char *end = charset;
+              while (*end && !IS_SPACE (*end) && '\"' != *end && ';' != *end)
+                end++;
+              if (*charset)
+              {
+                if (*end != '\0') {
+                  // if we're not at the very end of the line, we need
+                  // to generate a new string without the trailing crud
+                  nsAutoCString rawCharSet;
+                  rawCharSet.Assign(charset, end - charset);
+                  m_newMsgHdr->SetCharset(rawCharSet.get());
+                } else {
+                  m_newMsgHdr->SetCharset(charset);
+                }
+              }
+            }
+          }
+          substring = PL_strcasestr(content_type->value, "multipart/mixed");
+          if (substring)
+          {
+            uint32_t newFlags;
+            m_newMsgHdr->OrFlags(nsMsgMessageFlags::Attachment, &newFlags);
+          }
+        }
+      }
+    }
+    else
+    {
+      NS_ASSERTION(false, "error creating message header");
+      rv = NS_ERROR_OUT_OF_MEMORY;
+    }
+  }
+  else
+    rv = NS_OK;
+
+  //### why is this stuff const?
+  char *tmp = (char*) to.value;
+  PR_Free(tmp);
+  tmp = (char*) cc.value;
+  PR_Free(tmp);
+
+  return rv;
+}
+
+nsParseNewMailState::nsParseNewMailState()
+    : m_disableFilters(false)
+{
+  m_ibuffer = nullptr;
+  m_ibuffer_size = 0;
+  m_ibuffer_fp = 0;
+  m_numNotNewMessages = 0;
+ }
+
+NS_IMPL_ISUPPORTS_INHERITED(nsParseNewMailState, nsMsgMailboxParser, nsIMsgFilterHitNotify)
+
+nsresult
+nsParseNewMailState::Init(nsIMsgFolder *serverFolder, nsIMsgFolder *downloadFolder,
+                          nsIMsgWindow *aMsgWindow, nsIMsgDBHdr *aHdr,
+                          nsIOutputStream *aOutputStream)
+{
+  nsresult rv;
+  Clear();
+  m_rootFolder = serverFolder;
+  m_msgWindow = aMsgWindow;
+  m_downloadFolder = downloadFolder;
+
+  m_newMsgHdr = aHdr;
+  m_outputStream = aOutputStream;
+  // the new mail parser isn't going to get the stream input, it seems, so we can't use
+  // the OnStartRequest mechanism the mailbox parser uses. So, let's open the db right now.
+  nsCOMPtr<nsIMsgDBService> msgDBService = do_GetService(NS_MSGDB_SERVICE_CONTRACTID, &rv);
+  if (msgDBService && !m_mailDB)
+    rv = msgDBService->OpenFolderDB(downloadFolder, false,
+                                    getter_AddRefs(m_mailDB));
+  NS_ENSURE_SUCCESS(rv, rv);
+  nsCOMPtr <nsIMsgFolder> rootMsgFolder = do_QueryInterface(serverFolder, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsIMsgIncomingServer> server;
+  rv = rootMsgFolder->GetServer(getter_AddRefs(server));
+  if (NS_SUCCEEDED(rv))
+  {
+    rv = server->GetFilterList(aMsgWindow, getter_AddRefs(m_filterList));
+
+    if (m_filterList)
+      rv = server->ConfigureTemporaryFilters(m_filterList);
+    // check if this server defers to another server, in which case
+    // we'll use that server's filters as well.
+    nsCOMPtr <nsIMsgFolder> deferredToRootFolder;
+    server->GetRootMsgFolder(getter_AddRefs(deferredToRootFolder));
+    if (rootMsgFolder != deferredToRootFolder)
+    {
+      nsCOMPtr <nsIMsgIncomingServer> deferredToServer;
+      deferredToRootFolder->GetServer(getter_AddRefs(deferredToServer));
+      if (deferredToServer)
+        deferredToServer->GetFilterList(aMsgWindow, getter_AddRefs(m_deferredToServerFilterList));
+    }
+  }
+  m_disableFilters = false;
+  return NS_OK;
+}
+
+nsParseNewMailState::~nsParseNewMailState()
+{
+  if (m_mailDB)
+    m_mailDB->Close(true);
+  if (m_backupMailDB)
+    m_backupMailDB->ForceClosed();
+#ifdef DOING_JSFILTERS
+  JSFilter_cleanup();
+#endif
+}
+
+// not an IMETHOD so we don't need to do error checking or return an error.
+// We only have one caller.
+void nsParseNewMailState::GetMsgWindow(nsIMsgWindow **aMsgWindow)
+{
+  NS_IF_ADDREF(*aMsgWindow = m_msgWindow);
+}
+
+
+// This gets called for every message because libnet calls IncorporateBegin,
+// IncorporateWrite (once or more), and IncorporateComplete for every message.
+void nsParseNewMailState::DoneParsingFolder(nsresult status)
+{
+  /* End of file.  Flush out any partial line remaining in the buffer. */
+  if (m_ibuffer_fp > 0)
+  {
+    ParseFolderLine(m_ibuffer, m_ibuffer_fp);
+    m_ibuffer_fp = 0;
+  }
+  PublishMsgHeader(nullptr);
+  if (m_mailDB)  // finished parsing, so flush db folder info
+    UpdateDBFolderInfo();
+
+    /* We're done reading the folder - we don't need these things
+   any more. */
+  PR_FREEIF (m_ibuffer);
+  m_ibuffer_size = 0;
+  PR_FREEIF (m_obuffer);
+  m_obuffer_size = 0;
+}
+
+void nsParseNewMailState::OnNewMessage(nsIMsgWindow *msgWindow)
+{
+}
+
+int32_t nsParseNewMailState::PublishMsgHeader(nsIMsgWindow *msgWindow)
+{
+  bool moved = false;
+  FinishHeader();
+
+  if (m_newMsgHdr)
+  {
+    uint32_t newFlags, oldFlags;
+    m_newMsgHdr->GetFlags(&oldFlags);
+    if (!(oldFlags & nsMsgMessageFlags::Read)) // don't mark read messages as new.
+      m_newMsgHdr->OrFlags(nsMsgMessageFlags::New, &newFlags);
+
+    if (!m_disableFilters)
+    {
+      uint64_t msgOffset;
+      (void) m_newMsgHdr->GetMessageOffset(&msgOffset);
+      m_curHdrOffset = msgOffset;
+
+      nsCOMPtr<nsIMsgIncomingServer> server;
+      nsresult rv = m_rootFolder->GetServer(getter_AddRefs(server));
+      NS_ENSURE_SUCCESS(rv, 0);
+      int32_t duplicateAction;
+      server->GetIncomingDuplicateAction(&duplicateAction);
+      if (duplicateAction != nsIMsgIncomingServer::keepDups)
+      {
+        bool isDup;
+        server->IsNewHdrDuplicate(m_newMsgHdr, &isDup);
+        if (isDup)
+        {
+          // we want to do something similar to applying filter hits.
+          // if a dup is marked read, it shouldn't trigger biff.
+          // Same for deleting it or moving it to trash.
+          switch (duplicateAction)
+          {
+            case nsIMsgIncomingServer::deleteDups:
+              {
+              nsCOMPtr<nsIMsgPluggableStore> msgStore;
+              nsresult rv =
+                m_downloadFolder->GetMsgStore(getter_AddRefs(msgStore));
+              if (NS_SUCCEEDED(rv))
+              {
+                rv = msgStore->DiscardNewMessage(m_outputStream, m_newMsgHdr);
+                if (NS_FAILED(rv))
+                  m_rootFolder->ThrowAlertMsg("dupDeleteFolderTruncateFailed", msgWindow);
+              }
+                m_mailDB->RemoveHeaderMdbRow(m_newMsgHdr);
+              }
+              break;
+
+            case nsIMsgIncomingServer::moveDupsToTrash:
+              {
+                nsCOMPtr <nsIMsgFolder> trash;
+                GetTrashFolder(getter_AddRefs(trash));
+                if (trash) {
+                  uint32_t newFlags;
+                  bool msgMoved;
+                  m_newMsgHdr->AndFlags(~nsMsgMessageFlags::New, &newFlags);
+                  nsCOMPtr<nsIMsgPluggableStore> msgStore;
+                  rv = m_downloadFolder->GetMsgStore(getter_AddRefs(msgStore));
+                  if (NS_SUCCEEDED(rv))
+                    rv = msgStore->MoveNewlyDownloadedMessage(m_newMsgHdr, trash, &msgMoved);
+                  if (NS_SUCCEEDED(rv) && !msgMoved) {
+                    rv = MoveIncorporatedMessage(m_newMsgHdr, m_mailDB, trash,
+                                            nullptr, msgWindow);
+                    if (NS_SUCCEEDED(rv))
+                      rv = m_mailDB->RemoveHeaderMdbRow(m_newMsgHdr);
+                  }
+                  if (NS_FAILED(rv))
+                    NS_WARNING("moveDupsToTrash failed for some reason.");
+                }
+              }
+              break;
+            case nsIMsgIncomingServer::markDupsRead:
+              MarkFilteredMessageRead(m_newMsgHdr);
+              break;
+          }
+          int32_t numNewMessages;
+          m_downloadFolder->GetNumNewMessages(false, &numNewMessages);
+          m_downloadFolder->SetNumNewMessages(numNewMessages - 1);
+
+          m_newMsgHdr = nullptr;
+          return 0;
+        }
+      }
+
+      ApplyFilters(&moved, msgWindow, msgOffset);
+    }
+    if (!moved)
+    {
+      if (m_mailDB)
+      {
+        m_mailDB->AddNewHdrToDB(m_newMsgHdr, true);
+        nsCOMPtr<nsIMsgFolderNotificationService> notifier(do_GetService(NS_MSGNOTIFICATIONSERVICE_CONTRACTID));
+        if (notifier)
+          notifier->NotifyMsgAdded(m_newMsgHdr);
+        // mark the header as not yet reported classified
+        nsMsgKey msgKey;
+        m_newMsgHdr->GetMessageKey(&msgKey);
+        m_downloadFolder->OrProcessingFlags(
+           msgKey, nsMsgProcessingFlags::NotReportedClassified);
+      }
+    } // if it was moved by imap filter, m_parseMsgState->m_newMsgHdr == nullptr
+    m_newMsgHdr = nullptr;
+  }
+  return 0;
+}
+
+// We've found the start of the next message, so finish this one off.
+NS_IMETHODIMP nsParseNewMailState::FinishHeader()
+{
+  if (m_newMsgHdr)
+  {
+    m_newMsgHdr->SetMessageSize(m_position - m_envelope_pos);
+    m_newMsgHdr->SetLineCount(m_body_lines);
+  }
+  return NS_OK;
+}
+
+nsresult nsParseNewMailState::GetTrashFolder(nsIMsgFolder **pTrashFolder)
+{
+  nsresult rv=NS_ERROR_UNEXPECTED;
+  if (!pTrashFolder)
+    return NS_ERROR_NULL_POINTER;
+
+  if (m_downloadFolder)
+  {
+    nsCOMPtr <nsIMsgIncomingServer> incomingServer;
+    m_downloadFolder->GetServer(getter_AddRefs(incomingServer));
+    nsCOMPtr <nsIMsgFolder> rootMsgFolder;
+    incomingServer->GetRootMsgFolder(getter_AddRefs(rootMsgFolder));
+    if (rootMsgFolder)
+    {
+      rv = rootMsgFolder->GetFolderWithFlags(nsMsgFolderFlags::Trash, pTrashFolder);
+      if (!*pTrashFolder)
+        rv = NS_ERROR_FAILURE;
+    }
+  }
+  return rv;
+}
+
+void nsParseNewMailState::ApplyFilters(bool *pMoved, nsIMsgWindow *msgWindow, uint64_t msgOffset)
+{
+  m_msgMovedByFilter = m_msgCopiedByFilter = false;
+  m_curHdrOffset = msgOffset;
+
+  if (!m_disableFilters)
+  {
+    nsCOMPtr<nsIMsgDBHdr> msgHdr = m_newMsgHdr;
+    nsCOMPtr<nsIMsgFolder> downloadFolder = m_downloadFolder;
+    nsCOMPtr <nsIMsgFolder> rootMsgFolder = do_QueryInterface(m_rootFolder);
+    if (rootMsgFolder)
+    {
+      if (!downloadFolder)
+        rootMsgFolder->GetFolderWithFlags(nsMsgFolderFlags::Inbox,
+                                          getter_AddRefs(downloadFolder));
+      if (downloadFolder)
+        downloadFolder->GetURI(m_inboxUri);
+      char * headers = m_headers.GetBuffer();
+      uint32_t headersSize = m_headers.GetBufferPos();
+      if (m_filterList)
+        (void) m_filterList->
+          ApplyFiltersToHdr(nsMsgFilterType::InboxRule, msgHdr, downloadFolder,
+                            m_mailDB, headers, headersSize, this, msgWindow);
+      if (!m_msgMovedByFilter && m_deferredToServerFilterList)
+      {
+        (void) m_deferredToServerFilterList->
+          ApplyFiltersToHdr(nsMsgFilterType::InboxRule, msgHdr, downloadFolder,
+                            m_mailDB, headers, headersSize, this, msgWindow);
+      }
+    }
+  }
+  if (pMoved)
+    *pMoved = m_msgMovedByFilter;
+}
+
+NS_IMETHODIMP nsParseNewMailState::ApplyFilterHit(nsIMsgFilter *filter, nsIMsgWindow *msgWindow, bool *applyMore)
+{
+  NS_ENSURE_ARG_POINTER(filter);
+  NS_ENSURE_ARG_POINTER(applyMore);
+
+  uint32_t newFlags;
+  nsresult rv = NS_OK;
+
+  *applyMore = true;
+
+  nsCOMPtr<nsIMsgDBHdr> msgHdr = m_newMsgHdr;
+
+  nsCOMPtr<nsIArray> filterActionList;
+
+  rv = filter->GetSortedActionList(getter_AddRefs(filterActionList));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  uint32_t numActions;
+  rv = filterActionList->GetLength(&numActions);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  bool loggingEnabled = false;
+  if (m_filterList && numActions)
+    m_filterList->GetLoggingEnabled(&loggingEnabled);
+
+  bool msgIsNew = true;
+  for (uint32_t actionIndex = 0; actionIndex < numActions && *applyMore; actionIndex++)
+  {
+    nsCOMPtr<nsIMsgRuleAction> filterAction;
+    rv = filterActionList->QueryElementAt(actionIndex, NS_GET_IID(nsIMsgRuleAction),
+                                                       getter_AddRefs(filterAction));
+    if (NS_FAILED(rv) || !filterAction)
+      continue;
+
+    nsMsgRuleActionType actionType;
+    if (NS_SUCCEEDED(filterAction->GetType(&actionType)))
+    {
+      if (loggingEnabled)
+        (void)filter->LogRuleHit(filterAction, msgHdr);
+
+      nsCString actionTargetFolderUri;
+      if (actionType == nsMsgFilterAction::MoveToFolder ||
+          actionType == nsMsgFilterAction::CopyToFolder)
+      {
+
+        rv = filterAction->GetTargetFolderUri(actionTargetFolderUri);
+        if (NS_FAILED(rv) || actionTargetFolderUri.IsEmpty())
+        {
+          NS_ASSERTION(false, "actionTargetFolderUri is empty");
+          continue;
+        }
+      }
+      switch (actionType)
+      {
+      case nsMsgFilterAction::Delete:
+        {
+          nsCOMPtr <nsIMsgFolder> trash;
+          // set value to trash folder
+          rv = GetTrashFolder(getter_AddRefs(trash));
+          if (NS_SUCCEEDED(rv) && trash)
+            rv = trash->GetURI(actionTargetFolderUri);
+
+          msgHdr->OrFlags(nsMsgMessageFlags::Read, &newFlags); // mark read in trash.
+          msgIsNew = false;
+        }
+
+        // FALLTHROUGH
+        MOZ_FALLTHROUGH;
+      case nsMsgFilterAction::MoveToFolder:
+        // if moving to a different file, do it.
+        if (actionTargetFolderUri.get() && !m_inboxUri.Equals(actionTargetFolderUri,
+                                                              nsCaseInsensitiveCStringComparator()))
+        {
+          nsresult err;
+          nsCOMPtr<nsIRDFService> rdf(do_GetService(kRDFServiceCID, &err));
+          NS_ENSURE_SUCCESS(err, err);
+          nsCOMPtr<nsIRDFResource> res;
+          err = rdf->GetResource(actionTargetFolderUri, getter_AddRefs(res));
+          if (NS_FAILED(err))
+            return err;
+
+          nsCOMPtr<nsIMsgFolder> destIFolder(do_QueryInterface(res, &err));
+          if (NS_FAILED(err))
+            return err;
+          bool msgMoved = false;
+          // If we're moving to an imap folder, or this message has already
+          // has a pending copy action, use the imap coalescer so that
+          // we won't truncate the inbox before the copy fires.
+          if (m_msgCopiedByFilter ||
+              StringBeginsWith(actionTargetFolderUri, NS_LITERAL_CSTRING("imap:")))
+          {
+            if (!m_moveCoalescer)
+              m_moveCoalescer = new nsImapMoveCoalescer(m_downloadFolder, m_msgWindow);
+            NS_ENSURE_TRUE(m_moveCoalescer, NS_ERROR_OUT_OF_MEMORY);
+            nsMsgKey msgKey;
+            (void) msgHdr->GetMessageKey(&msgKey);
+            m_moveCoalescer->AddMove(destIFolder, msgKey);
+            err = NS_OK;
+            msgIsNew = false;
+          }
+          else
+          {
+            nsCOMPtr<nsIMsgPluggableStore> msgStore;
+            err = m_downloadFolder->GetMsgStore(getter_AddRefs(msgStore));
+            if (NS_SUCCEEDED(err))
+              err = msgStore->MoveNewlyDownloadedMessage(msgHdr, destIFolder, &msgMoved);
+            if (NS_SUCCEEDED(err) && !msgMoved)
+              err = MoveIncorporatedMessage(msgHdr, m_mailDB, destIFolder,
+                                            filter, msgWindow);
+            m_msgMovedByFilter = NS_SUCCEEDED(err);
+            if (!m_msgMovedByFilter /* == NS_FAILED(err) */)
+            {
+              // XXX: Invoke MSG_LOG_TO_CONSOLE once bug 1135265 lands.
+              if (loggingEnabled)
+                (void) filter->LogRuleHitFail(filterAction, msgHdr, err, "Move failed");
+            }
+          }
+        }
+        *applyMore = false;
+        break;
+
+        case nsMsgFilterAction::CopyToFolder:
+        {
+          nsCString uri;
+          rv = m_rootFolder->GetURI(uri);
+
+          if (!actionTargetFolderUri.IsEmpty() && !actionTargetFolderUri.Equals(uri))
+          {
+            nsCOMPtr<nsIMutableArray> messageArray(do_CreateInstance(NS_ARRAY_CONTRACTID));
+            messageArray->AppendElement(msgHdr, false);
+
+            nsCOMPtr<nsIMsgFolder> dstFolder;
+            nsCOMPtr<nsIMsgCopyService> copyService;
+            rv = GetExistingFolder(actionTargetFolderUri,
+                                   getter_AddRefs(dstFolder));
+            if (NS_SUCCEEDED(rv)) {
+              copyService = do_GetService(NS_MSGCOPYSERVICE_CONTRACTID, &rv);
+            }
+            else {
+              // Let's show a more specific warning.
+              NS_WARNING("Target Folder does not exist.");
+              return rv;
+            }
+            if (NS_SUCCEEDED(rv))
+              rv = copyService->CopyMessages(m_downloadFolder, messageArray, dstFolder,
+                                             false, nullptr, msgWindow, false);
+
+            if (NS_FAILED(rv)) {
+              // XXX: Invoke MSG_LOG_TO_CONSOLE once bug 1135265 lands.
+              if (loggingEnabled)
+                (void) filter->LogRuleHitFail(filterAction, msgHdr, rv, "Copy failed");
+            }
+            else
+              m_msgCopiedByFilter = true;
+          }
+        }
+        break;
+      case nsMsgFilterAction::MarkRead:
+        msgIsNew = false;
+        MarkFilteredMessageRead(msgHdr);
+        break;
+      case nsMsgFilterAction::MarkUnread:
+        msgIsNew = true;
+        MarkFilteredMessageUnread(msgHdr);
+        break;
+      case nsMsgFilterAction::KillThread:
+        msgHdr->SetUint32Property("ProtoThreadFlags", nsMsgMessageFlags::Ignored);
+        break;
+      case nsMsgFilterAction::KillSubthread:
+        msgHdr->OrFlags(nsMsgMessageFlags::Ignored, &newFlags);
+        break;
+      case nsMsgFilterAction::WatchThread:
+        msgHdr->OrFlags(nsMsgMessageFlags::Watched, &newFlags);
+        break;
+      case nsMsgFilterAction::MarkFlagged:
+        {
+          nsCOMPtr<nsIMutableArray> messageArray(do_CreateInstance(NS_ARRAY_CONTRACTID));
+          messageArray->AppendElement(msgHdr, false);
+          m_downloadFolder->MarkMessagesFlagged(messageArray, true);
+        }
+        break;
+      case nsMsgFilterAction::ChangePriority:
+        nsMsgPriorityValue filterPriority;
+        filterAction->GetPriority(&filterPriority);
+        msgHdr->SetPriority(filterPriority);
+        break;
+      case nsMsgFilterAction::AddTag:
+      {
+        nsCString keyword;
+        filterAction->GetStrValue(keyword);
+        nsCOMPtr<nsIMutableArray> messageArray(do_CreateInstance(NS_ARRAY_CONTRACTID));
+        messageArray->AppendElement(msgHdr, false);
+        m_downloadFolder->AddKeywordsToMessages(messageArray, keyword);
+        break;
+      }
+      case nsMsgFilterAction::Label:
+        nsMsgLabelValue filterLabel;
+        filterAction->GetLabel(&filterLabel);
+        nsMsgKey msgKey;
+        msgHdr->GetMessageKey(&msgKey);
+        m_mailDB->SetLabel(msgKey, filterLabel);
+        break;
+      case nsMsgFilterAction::JunkScore:
+      {
+        nsAutoCString junkScoreStr;
+        int32_t junkScore;
+        filterAction->GetJunkScore(&junkScore);
+        junkScoreStr.AppendInt(junkScore);
+        if (junkScore == nsIJunkMailPlugin::IS_SPAM_SCORE)
+          msgIsNew = false;
+        nsMsgKey msgKey;
+        msgHdr->GetMessageKey(&msgKey);
+        msgHdr->SetStringProperty("junkscore", junkScoreStr.get());
+        msgHdr->SetStringProperty("junkscoreorigin", "filter");
+        break;
+      }
+      case nsMsgFilterAction::Forward:
+        {
+          nsCString forwardTo;
+          filterAction->GetStrValue(forwardTo);
+          m_forwardTo.AppendElement(forwardTo);
+          m_msgToForwardOrReply = msgHdr;
+        }
+        break;
+      case nsMsgFilterAction::Reply:
+        {
+          nsCString replyTemplateUri;
+          filterAction->GetStrValue(replyTemplateUri);
+          m_replyTemplateUri.AppendElement(replyTemplateUri);
+          m_msgToForwardOrReply = msgHdr;
+          m_ruleAction = filterAction;
+          m_filter = filter;
+        }
+        break;
+      case nsMsgFilterAction::DeleteFromPop3Server:
+        {
+          uint32_t flags = 0;
+          nsCOMPtr <nsIMsgFolder> downloadFolder;
+          msgHdr->GetFolder(getter_AddRefs(downloadFolder));
+          nsCOMPtr <nsIMsgLocalMailFolder> localFolder = do_QueryInterface(downloadFolder);
+          msgHdr->GetFlags(&flags);
+          if (localFolder)
+          {
+            nsCOMPtr<nsIMutableArray> messages = do_CreateInstance(NS_ARRAY_CONTRACTID, &rv);
+            NS_ENSURE_SUCCESS(rv, rv);
+            messages->AppendElement(msgHdr, false);
+            // This action ignores the deleteMailLeftOnServer preference
+            localFolder->MarkMsgsOnPop3Server(messages, POP3_FORCE_DEL);
+
+            // If this is just a header, throw it away. It's useless now
+            // that the server copy is being deleted.
+            if (flags & nsMsgMessageFlags::Partial)
+            {
+              m_msgMovedByFilter = true;
+              msgIsNew = false;
+            }
+          }
+        }
+        break;
+      case nsMsgFilterAction::FetchBodyFromPop3Server:
+        {
+          uint32_t flags = 0;
+          nsCOMPtr <nsIMsgFolder> downloadFolder;
+          msgHdr->GetFolder(getter_AddRefs(downloadFolder));
+          nsCOMPtr <nsIMsgLocalMailFolder> localFolder = do_QueryInterface(downloadFolder);
+          msgHdr->GetFlags(&flags);
+          if (localFolder && (flags & nsMsgMessageFlags::Partial))
+          {
+            nsCOMPtr<nsIMutableArray> messages = do_CreateInstance(NS_ARRAY_CONTRACTID, &rv);
+            NS_ENSURE_SUCCESS(rv, rv);
+            messages->AppendElement(msgHdr, false);
+            localFolder->MarkMsgsOnPop3Server(messages, POP3_FETCH_BODY);
+            // Don't add this header to the DB, we're going to replace it
+            // with the full message.
+            m_msgMovedByFilter = true;
+            msgIsNew = false;
+            // Don't do anything else in this filter, wait until we
+            // have the full message.
+            *applyMore = false;
+          }
+        }
+        break;
+
+      case nsMsgFilterAction::StopExecution:
+      {
+        // don't apply any more filters
+        *applyMore = false;
+      }
+      break;
+
+      case nsMsgFilterAction::Custom:
+      {
+        nsCOMPtr<nsIMsgFilterCustomAction> customAction;
+        rv = filterAction->GetCustomAction(getter_AddRefs(customAction));
+        NS_ENSURE_SUCCESS(rv, rv);
+
+        nsAutoCString value;
+        filterAction->GetStrValue(value);
+
+        nsCOMPtr<nsIMutableArray> messageArray(
+            do_CreateInstance(NS_ARRAY_CONTRACTID, &rv));
+        NS_ENSURE_TRUE(messageArray, rv);
+        if (NS_SUCCEEDED(rv))
+          rv = messageArray->AppendElement(msgHdr, false);
+
+
+        if (NS_SUCCEEDED(rv))
+          rv = customAction->Apply(messageArray, value, nullptr,
+                                   nsMsgFilterType::InboxRule, msgWindow);
+        if (NS_FAILED(rv)) {
+            // XXX: Invoke MSG_LOG_TO_CONSOLE once bug 1135265 lands.
+            if (loggingEnabled)
+              (void) filter->LogRuleHitFail(filterAction, msgHdr, rv, "Copy failed");
+        }
+      }
+      break;
+
+
+      default:
+        // XXX should not be reached. Check in debug build.
+        NS_ERROR("This default should not be reached.");
+        break;
+      }
+    }
+  }
+  if (!msgIsNew)
+  {
+    int32_t numNewMessages;
+    m_downloadFolder->GetNumNewMessages(false, &numNewMessages);
+    if (numNewMessages > 0)
+      m_downloadFolder->SetNumNewMessages(numNewMessages - 1);
+    m_numNotNewMessages++;
+  }
+  return rv;
+}
+
+// this gets run in a second pass, after apply filters to a header.
+nsresult nsParseNewMailState::ApplyForwardAndReplyFilter(nsIMsgWindow *msgWindow)
+{
+  nsresult rv = NS_OK;
+  nsCOMPtr <nsIMsgIncomingServer> server;
+
+  uint32_t i;
+  uint32_t count = m_forwardTo.Length();
+  for (i = 0; i < count; i++)
+  {
+    if (!m_forwardTo[i].IsEmpty())
+    {
+      nsAutoString forwardStr;
+      CopyASCIItoUTF16(m_forwardTo[i], forwardStr);
+      rv = m_rootFolder->GetServer(getter_AddRefs(server));
+      NS_ENSURE_SUCCESS(rv, rv);
+      {
+        nsCOMPtr<nsIMsgComposeService> compService =
+          do_GetService (NS_MSGCOMPOSESERVICE_CONTRACTID, &rv);
+        NS_ENSURE_SUCCESS(rv, rv);
+        rv = compService->ForwardMessage(forwardStr, m_msgToForwardOrReply,
+                                         msgWindow, server,
+                                         nsIMsgComposeService::kForwardAsDefault);
+      }
+    }
+  }
+  m_forwardTo.Clear();
+
+  count = m_replyTemplateUri.Length();
+  for (i = 0; i < count; i++)
+  {
+    if (!m_replyTemplateUri[i].IsEmpty())
+    {
+      // copy this and truncate the original, so we don't accidentally re-use it on the next hdr.
+      rv = m_rootFolder->GetServer(getter_AddRefs(server));
+      if (server)
+      {
+        nsCOMPtr <nsIMsgComposeService> compService = do_GetService (NS_MSGCOMPOSESERVICE_CONTRACTID) ;
+        if (compService) {
+          rv = compService->ReplyWithTemplate(m_msgToForwardOrReply,
+                                              m_replyTemplateUri[i].get(),
+                                              msgWindow, server);
+          if (NS_FAILED(rv)) {
+            NS_WARNING("ReplyWithTemplate failed");
+            if (rv == NS_ERROR_ABORT) {
+              m_filter->LogRuleHitFail(m_ruleAction, m_msgToForwardOrReply, rv,
+                                       "Sending reply aborted");
+            } else {
+              m_filter->LogRuleHitFail(m_ruleAction, m_msgToForwardOrReply, rv,
+                                       "Error sending reply");
+            }
+          }
+        }
+      }
+    }
+  }
+  m_replyTemplateUri.Clear();
+  m_msgToForwardOrReply = nullptr;
+  return rv;
+}
+
+void nsParseNewMailState::MarkFilteredMessageRead(nsIMsgDBHdr *msgHdr)
+{
+  nsCOMPtr<nsIMutableArray> messageArray(do_CreateInstance(NS_ARRAY_CONTRACTID));
+  messageArray->AppendElement(msgHdr, false);
+  m_downloadFolder->MarkMessagesRead(messageArray, true);
+}
+
+void nsParseNewMailState::MarkFilteredMessageUnread(nsIMsgDBHdr *msgHdr)
+{
+  uint32_t newFlags;
+  if (m_mailDB)
+  {
+    nsMsgKey msgKey;
+    msgHdr->GetMessageKey(&msgKey);
+    m_mailDB->AddToNewList(msgKey);
+  }
+  else
+  {
+    msgHdr->OrFlags(nsMsgMessageFlags::New, &newFlags);
+  }
+  nsCOMPtr<nsIMutableArray> messageArray(do_CreateInstance(NS_ARRAY_CONTRACTID));
+  messageArray->AppendElement(msgHdr, false);
+  m_downloadFolder->MarkMessagesRead(messageArray, false);
+}
+
+nsresult nsParseNewMailState::EndMsgDownload()
+{
+  if (m_moveCoalescer)
+    m_moveCoalescer->PlaybackMoves();
+
+  // need to do this for all folders that had messages filtered into them
+  uint32_t serverCount = m_filterTargetFolders.Count();
+  nsresult rv;
+  nsCOMPtr<nsIMsgMailSession> session =
+           do_GetService(NS_MSGMAILSESSION_CONTRACTID, &rv);
+  if (NS_SUCCEEDED(rv) && session) // don't use NS_ENSURE_SUCCESS here - we need to release semaphore below
+  {
+    for (uint32_t index = 0; index < serverCount; index++)
+    {
+      bool folderOpen;
+      session->IsFolderOpenInWindow(m_filterTargetFolders[index], &folderOpen);
+      if (!folderOpen)
+      {
+        uint32_t folderFlags;
+        m_filterTargetFolders[index]->GetFlags(&folderFlags);
+        if (! (folderFlags & (nsMsgFolderFlags::Trash | nsMsgFolderFlags::Inbox)))
+        {
+          bool filtersRun;
+          m_filterTargetFolders[index]->CallFilterPlugins(nullptr, &filtersRun);
+          if (!filtersRun)
+            m_filterTargetFolders[index]->SetMsgDatabase(nullptr);
+        }
+      }
+    }
+  }
+  m_filterTargetFolders.Clear();
+  return rv;
+}
+
+nsresult nsParseNewMailState::AppendMsgFromStream(nsIInputStream *fileStream,
+                                                  nsIMsgDBHdr *aHdr,
+                                                  uint32_t length,
+                                                  nsIMsgFolder *destFolder)
+{
+  nsCOMPtr <nsISeekableStream> seekableStream = do_QueryInterface(fileStream);
+  nsCOMPtr<nsIMsgPluggableStore> store;
+  nsCOMPtr<nsIOutputStream> destOutputStream;
+  nsresult rv = destFolder->GetMsgStore(getter_AddRefs(store));
+  NS_ENSURE_SUCCESS(rv, rv);
+  bool reusable;
+  rv = store->GetNewMsgOutputStream(destFolder, &aHdr, &reusable,
+                                    getter_AddRefs(destOutputStream));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  if (!m_ibuffer)
+  {
+    m_ibuffer_size = FILE_IO_BUFFER_SIZE;
+    m_ibuffer = (char *) PR_Malloc(m_ibuffer_size);
+    NS_ASSERTION(m_ibuffer != nullptr, "couldn't get memory to move msg");
+  }
+  m_ibuffer_fp = 0;
+
+  while (length > 0 && m_ibuffer)
+  {
+    uint32_t nRead;
+    fileStream->Read (m_ibuffer, length > m_ibuffer_size ? m_ibuffer_size  : length, &nRead);
+    if (nRead == 0)
+      break;
+
+    uint32_t bytesWritten;
+    // Check the number of bytes actually written to the stream.
+    destOutputStream->Write(m_ibuffer, nRead, &bytesWritten);
+    if (bytesWritten != nRead)
+    {
+      destOutputStream->Close();
+      return NS_MSG_ERROR_WRITING_MAIL_FOLDER;
+    }
+
+    length -= nRead;
+  }
+
+  NS_ASSERTION(length == 0, "didn't read all of original message in filter move");
+
+  // non-reusable streams will get closed by the store.
+  if (reusable)
+    destOutputStream->Close();
+  return store->FinishNewMessage(destOutputStream, aHdr);
+}
+
+/*
+ * Moves message pointed to by mailHdr into folder destIFolder.
+ * After successful move mailHdr is no longer usable by the caller.
+ */
+nsresult nsParseNewMailState::MoveIncorporatedMessage(nsIMsgDBHdr *mailHdr,
+                                                      nsIMsgDatabase *sourceDB,
+                                                      nsIMsgFolder *destIFolder,
+                                                      nsIMsgFilter *filter,
+                                                      nsIMsgWindow *msgWindow)
+{
+  NS_ENSURE_ARG_POINTER(destIFolder);
+  nsresult rv = NS_OK;
+
+  // check if the destination is a real folder (by checking for null parent)
+  // and if it can file messages (e.g., servers or news folders can't file messages).
+  // Or read only imap folders...
+  bool canFileMessages = true;
+  nsCOMPtr<nsIMsgFolder> parentFolder;
+  destIFolder->GetParent(getter_AddRefs(parentFolder));
+  if (parentFolder)
+    destIFolder->GetCanFileMessages(&canFileMessages);
+  if (!parentFolder || !canFileMessages)
+  {
+    if (filter)
+    {
+      filter->SetEnabled(false);
+      // we need to explicitly save the filter file.
+      if (m_filterList)
+        m_filterList->SaveToDefaultFile();
+      destIFolder->ThrowAlertMsg("filterDisabled", msgWindow);
+    }
+    return NS_MSG_NOT_A_MAIL_FOLDER;
+  }
+
+  uint32_t messageLength;
+  mailHdr->GetMessageSize(&messageLength);
+
+  nsCOMPtr<nsIMsgLocalMailFolder> localFolder = do_QueryInterface(destIFolder);
+  if (localFolder) {
+    bool destFolderTooBig = true;
+    rv = localFolder->WarnIfLocalFileTooBig(msgWindow, messageLength,
+                                            &destFolderTooBig);
+    if (NS_FAILED(rv) || destFolderTooBig)
+      return NS_MSG_ERROR_WRITING_MAIL_FOLDER;
+  }
+
+  nsCOMPtr<nsISupports> myISupports =
+    do_QueryInterface(static_cast<nsIMsgParseMailMsgState*>(this));
+
+  // Make sure no one else is writing into this folder
+  if (NS_FAILED(rv = destIFolder->AcquireSemaphore (myISupports)))
+  {
+    destIFolder->ThrowAlertMsg("filterFolderDeniedLocked", msgWindow);
+    return rv;
+  }
+  nsCOMPtr<nsIInputStream> inputStream;
+  bool reusable;
+  rv = m_downloadFolder->GetMsgInputStream(mailHdr, &reusable, getter_AddRefs(inputStream));
+  if (!inputStream)
+  {
+    NS_ERROR("couldn't get source msg input stream in move filter");
+    destIFolder->ReleaseSemaphore (myISupports);
+    return NS_MSG_FOLDER_UNREADABLE;  // ### dmb
+  }
+
+  nsCOMPtr<nsIMsgDatabase> destMailDB;
+
+  if (!localFolder)
+    return NS_MSG_POP_FILTER_TARGET_ERROR;
+
+  // don't force upgrade in place - open the db here before we start writing to the
+  // destination file because XP_Stat can return file size including bytes written...
+  rv = localFolder->GetDatabaseWOReparse(getter_AddRefs(destMailDB));
+  NS_WARNING_ASSERTION(destMailDB && NS_SUCCEEDED(rv),
+                       "failed to open mail db parsing folder");
+  nsCOMPtr<nsIMsgDBHdr> newHdr;
+
+  if (destMailDB)
+    rv = destMailDB->CopyHdrFromExistingHdr(m_new_key, mailHdr, true,
+                                            getter_AddRefs(newHdr));
+  if (NS_SUCCEEDED(rv) && !newHdr)
+    rv = NS_ERROR_UNEXPECTED;
+
+  if (NS_FAILED(rv))
+  {
+    destIFolder->ThrowAlertMsg("filterFolderHdrAddFailed", msgWindow);
+  } else {
+    rv = AppendMsgFromStream(inputStream, newHdr, messageLength, destIFolder);
+    if (NS_FAILED(rv))
+      destIFolder->ThrowAlertMsg("filterFolderWriteFailed", msgWindow);
+  }
+
+  if (NS_FAILED(rv))
+  {
+    if (destMailDB)
+      destMailDB->Close(true);
+
+    destIFolder->ReleaseSemaphore(myISupports);
+
+    return NS_MSG_ERROR_WRITING_MAIL_FOLDER;
+  }
+
+  bool movedMsgIsNew = false;
+  // if we have made it this far then the message has successfully been written to the new folder
+  // now add the header to the destMailDB.
+
+  uint32_t newFlags;
+  newHdr->GetFlags(&newFlags);
+  nsMsgKey msgKey;
+  newHdr->GetMessageKey(&msgKey);
+  if (!(newFlags & nsMsgMessageFlags::Read))
+  {
+    nsCString junkScoreStr;
+    (void) newHdr->GetStringProperty("junkscore", getter_Copies(junkScoreStr));
+    if (atoi(junkScoreStr.get()) == nsIJunkMailPlugin::IS_HAM_SCORE)
+    {
+      newHdr->OrFlags(nsMsgMessageFlags::New, &newFlags);
+      destMailDB->AddToNewList(msgKey);
+      movedMsgIsNew = true;
+    }
+  }
+  nsCOMPtr<nsIMsgFolderNotificationService> notifier(do_GetService(NS_MSGNOTIFICATIONSERVICE_CONTRACTID));
+  if (notifier)
+    notifier->NotifyMsgAdded(newHdr);
+  // mark the header as not yet reported classified
+  destIFolder->OrProcessingFlags(
+    msgKey, nsMsgProcessingFlags::NotReportedClassified);
+  m_msgToForwardOrReply = newHdr;
+
+  if (movedMsgIsNew)
+    destIFolder->SetHasNewMessages(true);
+  if (!m_filterTargetFolders.Contains(destIFolder))
+    m_filterTargetFolders.AppendObject(destIFolder);
+
+  destIFolder->ReleaseSemaphore (myISupports);
+
+  (void) localFolder->RefreshSizeOnDisk();
+
+  // Notify the message was moved.
+  if (notifier) {
+    nsCOMPtr<nsIMsgFolder> folder;
+    nsresult rv = mailHdr->GetFolder(getter_AddRefs(folder));
+    if (NS_SUCCEEDED(rv)) {
+      notifier->NotifyItemEvent(folder,
+                                NS_LITERAL_CSTRING("UnincorporatedMessageMoved"),
+                                newHdr);
+    } else {
+      NS_WARNING("Can't get folder for message that was moved.");
+    }
+  }
+
+  nsCOMPtr<nsIMsgPluggableStore> store;
+  rv = m_downloadFolder->GetMsgStore(getter_AddRefs(store));
+  if (store)
+    store->DiscardNewMessage(m_outputStream, mailHdr);
+  if (sourceDB)
+    sourceDB->RemoveHeaderMdbRow(mailHdr);
+
+  // update the folder size so we won't reparse.
+  UpdateDBFolderInfo(destMailDB);
+  destIFolder->UpdateSummaryTotals(true);
+
+  destMailDB->Commit(nsMsgDBCommitType::kLargeCommit);
+  return rv;
+}
diff --git a/mailnews/local/src/nsParseMailbox.h b/mailnews/local/src/nsParseMailbox.h
new file mode 100644
index 000000000..388f1e1b2
--- /dev/null
+++ b/mailnews/local/src/nsParseMailbox.h
@@ -0,0 +1,271 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsParseMailbox_H
+#define nsParseMailbox_H
+
+#include "mozilla/Attributes.h"
+#include "nsIURI.h"
+#include "nsIMsgParseMailMsgState.h"
+#include "nsIStreamListener.h"
+#include "nsMsgLineBuffer.h"
+#include "nsIMsgDatabase.h"
+#include "nsIMsgHdr.h"
+#include "nsIMsgStatusFeedback.h"
+#include "nsCOMPtr.h"
+#include "nsCOMArray.h"
+#include "nsIDBChangeListener.h"
+#include "nsIWeakReference.h"
+#include "nsIWeakReferenceUtils.h"
+#include "nsIMsgWindow.h"
+#include "nsImapMoveCoalescer.h"
+#include "nsAutoPtr.h"
+#include "nsStringGlue.h"
+#include "nsIMsgFilterList.h"
+#include "nsIMsgFilter.h"
+#include "nsIMsgFilterHitNotify.h"
+#include "nsIMsgFolderNotificationService.h"
+#include "nsTArray.h"
+
+class nsByteArray;
+class nsOutputFileStream;
+class nsIOFileStream;
+class nsInputFileStream;
+class nsIMsgFilter;
+class MSG_FolderInfoMail;
+class nsIMsgFilterList;
+class nsIMsgFolder;
+
+/* Used for the various things that parse RFC822 headers...
+ */
+typedef struct message_header
+{
+  const char *value; /* The contents of a header (after ": ") */
+  int32_t length;      /* The length of the data (it is not NULL-terminated.) */
+} message_header;
+
+// This object maintains the parse state for a single mail message.
+class nsParseMailMessageState : public nsIMsgParseMailMsgState, public nsIDBChangeListener
+{
+public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIMSGPARSEMAILMSGSTATE
+  NS_DECL_NSIDBCHANGELISTENER
+
+  nsParseMailMessageState();
+
+  void                  Init(uint64_t fileposition);
+  virtual nsresult      ParseFolderLine(const char *line, uint32_t lineLength);
+  virtual nsresult      StartNewEnvelope(const char *line, uint32_t lineLength);
+  nsresult              ParseHeaders();
+  nsresult              FinalizeHeaders();
+  nsresult              ParseEnvelope (const char *line, uint32_t line_size);
+  nsresult              InternSubject (struct message_header *header);
+
+  static bool    IsEnvelopeLine(const char *buf, int32_t buf_size);
+
+  nsCOMPtr<nsIMsgDBHdr> m_newMsgHdr; /* current message header we're building */
+  nsCOMPtr<nsIMsgDatabase>  m_mailDB;
+  nsCOMPtr<nsIMsgDatabase> m_backupMailDB;
+
+  nsMailboxParseState   m_state;
+  int64_t              m_position;
+  uint64_t              m_envelope_pos;
+  uint64_t              m_headerstartpos;
+  nsMsgKey              m_new_key;    // DB key for the new header.
+
+  nsByteArray           m_headers;
+
+  nsByteArray           m_envelope;
+
+  struct message_header m_message_id;
+  struct message_header m_references;
+  struct message_header m_date;
+  struct message_header m_delivery_date;
+  struct message_header m_from;
+  struct message_header m_sender;
+  struct message_header m_newsgroups;
+  struct message_header m_subject;
+  struct message_header m_status;
+  struct message_header m_mozstatus;
+  struct message_header m_mozstatus2;
+  struct message_header m_in_reply_to;
+  struct message_header m_replyTo;
+  struct message_header m_content_type;
+  struct message_header m_bccList;
+
+  // Support for having multiple To or Cc header lines in a message
+  nsTArray<struct message_header*> m_toList;
+  nsTArray<struct message_header*> m_ccList;
+  struct message_header *GetNextHeaderInAggregate (nsTArray<struct message_header*> &list);
+  void GetAggregateHeader (nsTArray<struct message_header*> &list, struct message_header *);
+  void ClearAggregateHeader (nsTArray<struct message_header*> &list);
+
+  struct message_header m_envelope_from;
+  struct message_header m_envelope_date;
+  struct message_header m_priority;
+  struct message_header m_account_key;
+  struct message_header m_keywords;
+  // Mdn support
+  struct message_header m_mdn_original_recipient;
+  struct message_header m_return_path;
+  struct message_header m_mdn_dnt; /* MDN Disposition-Notification-To: header */
+
+  PRTime m_receivedTime;
+  uint16_t              m_body_lines;
+
+  bool                  m_IgnoreXMozillaStatus;
+
+  // this enables extensions to add the values of particular headers to
+  // the .msf file as properties of nsIMsgHdr. It is initialized from a
+  // pref, mailnews.customDBHeaders
+  nsTArray<nsCString>   m_customDBHeaders;
+  struct message_header *m_customDBHeaderValues;
+  nsCString m_receivedValue; // accumulated received header
+protected:
+  virtual ~nsParseMailMessageState();
+};
+
+// This class is part of the mailbox parsing state machine
+class nsMsgMailboxParser : public nsIStreamListener, public nsParseMailMessageState, public nsMsgLineBuffer
+{
+public:
+  nsMsgMailboxParser(nsIMsgFolder *);
+  nsMsgMailboxParser();
+  nsresult Init();
+
+  bool    IsRunningUrl() { return m_urlInProgress;} // returns true if we are currently running a url and false otherwise...
+  NS_DECL_ISUPPORTS_INHERITED
+
+  ////////////////////////////////////////////////////////////////////////////////////////
+  // we suppport the nsIStreamListener interface
+  ////////////////////////////////////////////////////////////////////////////////////////
+  NS_DECL_NSIREQUESTOBSERVER
+  NS_DECL_NSISTREAMLISTENER
+
+  void    SetDB (nsIMsgDatabase *mailDB) {m_mailDB = mailDB; }
+
+  // message socket libnet callbacks, which come through folder pane
+  nsresult ProcessMailboxInputStream(nsIURI* aURL, nsIInputStream *aIStream, uint32_t aLength);
+
+  virtual void  DoneParsingFolder(nsresult status);
+  virtual void  AbortNewHeader();
+
+  // for nsMsgLineBuffer
+  virtual nsresult HandleLine(const char *line, uint32_t line_length) override;
+
+  void  UpdateDBFolderInfo();
+  void  UpdateDBFolderInfo(nsIMsgDatabase *mailDB);
+  void  UpdateStatusText(const char* stringName);
+
+  // Update the progress bar based on what we know.
+  virtual void    UpdateProgressPercent ();
+  virtual void OnNewMessage(nsIMsgWindow *msgWindow);
+
+protected:
+  virtual ~nsMsgMailboxParser();
+  nsCOMPtr<nsIMsgStatusFeedback> m_statusFeedback;
+
+  virtual int32_t     PublishMsgHeader(nsIMsgWindow *msgWindow);
+  void                FreeBuffers();
+
+  // data
+  nsString        m_folderName;
+  nsCString       m_inboxUri;
+  nsByteArray     m_inputStream;
+  int32_t         m_obuffer_size;
+  char            *m_obuffer;
+  uint64_t        m_graph_progress_total;
+  uint64_t        m_graph_progress_received;
+  bool            m_parsingDone;
+  PRTime          m_startTime;
+private:
+  // the following flag is used to determine when a url is currently being run. It is cleared on calls
+  // to ::StopBinding and it is set whenever we call Load on a url
+  bool      m_urlInProgress;
+  nsWeakPtr m_folder;
+  void ReleaseFolderLock();
+  nsresult AcquireFolderLock();
+
+};
+
+class nsParseNewMailState : public nsMsgMailboxParser
+, public nsIMsgFilterHitNotify
+{
+public:
+  nsParseNewMailState();
+  NS_DECL_ISUPPORTS_INHERITED
+
+  NS_IMETHOD FinishHeader() override;
+
+  nsresult Init(nsIMsgFolder *rootFolder, nsIMsgFolder *downloadFolder,
+                nsIMsgWindow *aMsgWindow, nsIMsgDBHdr *aHdr,
+                nsIOutputStream *aOutputStream);
+
+  virtual void  DoneParsingFolder(nsresult status) override;
+
+  void DisableFilters() {m_disableFilters = true;}
+
+  NS_DECL_NSIMSGFILTERHITNOTIFY
+
+  nsOutputFileStream *GetLogFile();
+  virtual int32_t PublishMsgHeader(nsIMsgWindow *msgWindow) override;
+  void            GetMsgWindow(nsIMsgWindow **aMsgWindow);
+  nsresult EndMsgDownload();
+
+  nsresult AppendMsgFromStream(nsIInputStream *fileStream, nsIMsgDBHdr *aHdr,
+                               uint32_t length, nsIMsgFolder *destFolder);
+
+  virtual void ApplyFilters(bool *pMoved, nsIMsgWindow *msgWindow,
+                            uint64_t msgOffset);
+  nsresult    ApplyForwardAndReplyFilter(nsIMsgWindow *msgWindow);
+  virtual void OnNewMessage(nsIMsgWindow *msgWindow) override;
+
+  // this keeps track of how many messages we downloaded that
+  // aren't new - e.g., marked read, or moved to an other server.
+  int32_t     m_numNotNewMessages;
+protected:
+  virtual ~nsParseNewMailState();
+  virtual nsresult GetTrashFolder(nsIMsgFolder **pTrashFolder);
+  virtual nsresult MoveIncorporatedMessage(nsIMsgDBHdr *mailHdr,
+                                          nsIMsgDatabase *sourceDB,
+                                          nsIMsgFolder *destIFolder,
+                                          nsIMsgFilter *filter,
+                                          nsIMsgWindow *msgWindow);
+  virtual void     MarkFilteredMessageRead(nsIMsgDBHdr *msgHdr);
+  virtual void     MarkFilteredMessageUnread(nsIMsgDBHdr *msgHdr);
+
+  nsCOMPtr <nsIMsgFilterList> m_filterList;
+  nsCOMPtr <nsIMsgFilterList> m_deferredToServerFilterList;
+  nsCOMPtr <nsIMsgFolder> m_rootFolder;
+  nsCOMPtr <nsIMsgWindow> m_msgWindow;
+  nsCOMPtr <nsIMsgFolder> m_downloadFolder;
+  nsCOMPtr<nsIOutputStream> m_outputStream;
+  nsCOMArray <nsIMsgFolder> m_filterTargetFolders;
+
+  RefPtr<nsImapMoveCoalescer> m_moveCoalescer;
+
+  bool          m_msgMovedByFilter;
+  bool          m_msgCopiedByFilter;
+  bool          m_disableFilters;
+  uint32_t      m_ibuffer_fp;
+  char          *m_ibuffer;
+  uint32_t      m_ibuffer_size;
+  // used for applying move filters, because in the case of using a temporary
+  // download file, the offset/key in the msg hdr is not right.
+  uint64_t      m_curHdrOffset;
+
+  // we have to apply the reply/forward filters in a second pass, after
+  // msg quarantining and moving to other local folders, so we remember the
+  // info we'll need to apply them with these vars.
+  // these need to be arrays in case we have multiple reply/forward filters.
+  nsTArray<nsCString> m_forwardTo;
+  nsTArray<nsCString> m_replyTemplateUri;
+  nsCOMPtr<nsIMsgDBHdr> m_msgToForwardOrReply;
+  nsCOMPtr<nsIMsgFilter> m_filter;
+  nsCOMPtr<nsIMsgRuleAction> m_ruleAction;
+};
+
+#endif
diff --git a/mailnews/local/src/nsPop3IncomingServer.cpp b/mailnews/local/src/nsPop3IncomingServer.cpp
new file mode 100644
index 000000000..261d141a4
--- /dev/null
+++ b/mailnews/local/src/nsPop3IncomingServer.cpp
@@ -0,0 +1,744 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "prmem.h"
+#include "plstr.h"
+#include "prprf.h"
+
+#include "nsCOMPtr.h"
+#include "nsIStringBundle.h"
+#include "nsIPop3IncomingServer.h"
+#include "nsPop3IncomingServer.h"
+#include "nsIPop3Service.h"
+#include "nsMsgBaseCID.h"
+#include "nsMsgLocalCID.h"
+#include "nsMsgFolderFlags.h"
+#include "nsPop3Protocol.h"
+#include "nsAutoPtr.h"
+#include "nsMsgKeyArray.h"
+#include "nsIMsgLocalMailFolder.h"
+#include "nsIMsgAccountManager.h"
+#include "nsIMsgMailNewsUrl.h"
+#include "nsServiceManagerUtils.h"
+#include "nsIMutableArray.h"
+#include "nsMsgUtils.h"
+#include "nsComponentManagerUtils.h"
+#include "mozilla/Likely.h"
+
+static NS_DEFINE_CID(kCPop3ServiceCID, NS_POP3SERVICE_CID);
+
+class nsPop3GetMailChainer final : public nsIUrlListener
+{
+public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIURLLISTENER
+
+  nsPop3GetMailChainer();
+  nsresult GetNewMailForServers(nsIPop3IncomingServer** servers, uint32_t count,
+                                nsIMsgWindow *msgWindow,
+                                nsIMsgFolder *folderToDownloadTo, nsIUrlListener *listener);
+  nsresult RunNextGetNewMail();
+protected:
+  ~nsPop3GetMailChainer();
+  nsCOMPtr <nsIMsgFolder> m_folderToDownloadTo;
+  nsCOMPtr <nsIMsgWindow> m_downloadingMsgWindow;
+  nsCOMArray<nsIPop3IncomingServer> m_serversToGetNewMailFor;
+  nsCOMPtr <nsIUrlListener> m_listener;
+};
+
+
+
+NS_IMPL_ISUPPORTS_INHERITED(nsPop3IncomingServer,
+                             nsMsgIncomingServer,
+                             nsIPop3IncomingServer,
+                             nsILocalMailIncomingServer)
+
+nsPop3IncomingServer::nsPop3IncomingServer()
+{
+  m_capabilityFlags =
+  POP3_AUTH_MECH_UNDEFINED |
+  POP3_HAS_AUTH_USER |               // should be always there
+  POP3_GURL_UNDEFINED |
+  POP3_UIDL_UNDEFINED |
+  POP3_TOP_UNDEFINED |
+  POP3_XTND_XLST_UNDEFINED;
+
+  m_canHaveFilters = true;
+  m_authenticated = false;
+}
+
+nsPop3IncomingServer::~nsPop3IncomingServer()
+{
+}
+
+NS_IMPL_SERVERPREF_BOOL(nsPop3IncomingServer,
+                        LeaveMessagesOnServer,
+                        "leave_on_server")
+
+NS_IMPL_SERVERPREF_BOOL(nsPop3IncomingServer,
+                        HeadersOnly,
+                        "headers_only")
+
+NS_IMPL_SERVERPREF_BOOL(nsPop3IncomingServer,
+                        DeleteMailLeftOnServer,
+                        "delete_mail_left_on_server")
+
+NS_IMPL_SERVERPREF_BOOL(nsPop3IncomingServer,
+                        DotFix,
+                        "dot_fix")
+
+NS_IMPL_SERVERPREF_BOOL(nsPop3IncomingServer,
+                        DeleteByAgeFromServer,
+                        "delete_by_age_from_server")
+
+NS_IMPL_SERVERPREF_INT(nsPop3IncomingServer,
+                        NumDaysToLeaveOnServer,
+                        "num_days_to_leave_on_server")
+
+
+NS_IMPL_SERVERPREF_BOOL(nsPop3IncomingServer,
+                            DeferGetNewMail,
+                            "defer_get_new_mail")
+
+NS_IMETHODIMP nsPop3IncomingServer::GetDeferredToAccount(nsACString& aRetVal)
+{
+  nsresult rv = GetCharValue("deferred_to_account", aRetVal);
+  if (aRetVal.IsEmpty())
+    return rv;
+  // We need to repair broken profiles that defer to hidden or invalid servers,
+  // so find out if the deferred to account has a valid non-hidden server, and
+  // if not, defer to the local folders inbox.
+  nsCOMPtr<nsIMsgAccountManager> acctMgr =
+                      do_GetService(NS_MSGACCOUNTMANAGER_CONTRACTID);
+  bool invalidAccount = true;
+  if (acctMgr)
+  {
+    nsCOMPtr<nsIMsgAccount> account;
+    nsCOMPtr<nsIMsgIncomingServer> server;
+    rv = acctMgr->GetAccount(aRetVal, getter_AddRefs(account));
+    if (account)
+    {
+      account->GetIncomingServer(getter_AddRefs(server));
+      if (server)
+        server->GetHidden(&invalidAccount);
+    }
+    if (invalidAccount)
+    {
+      nsCOMPtr<nsIMsgIncomingServer> localServer;
+      nsCOMPtr<nsIMsgAccount> localAccount;
+
+      rv = acctMgr->GetLocalFoldersServer(getter_AddRefs(localServer));
+      NS_ENSURE_SUCCESS(rv, rv);
+      // Try to copy any folders that have been stranded in the hidden account
+      // into the local folders account.
+      if (server)
+      {
+        nsCOMPtr<nsIMsgFolder> hiddenRootFolder;
+        nsCOMPtr<nsIMsgFolder> localFoldersRoot;
+        server->GetRootFolder(getter_AddRefs(hiddenRootFolder));
+        localServer->GetRootFolder(getter_AddRefs(localFoldersRoot));
+        if (hiddenRootFolder && localFoldersRoot)
+        {
+          // We're going to iterate over the folders in Local Folders-1,
+          // though I suspect only the Inbox will have messages. I don't
+          // think Sent Mail could end up here, but if any folders have
+          // messages, might as well copy them to the real Local Folders
+          // account.
+          nsCOMPtr<nsISimpleEnumerator> enumerator;
+          rv = hiddenRootFolder->GetSubFolders(getter_AddRefs(enumerator));
+          if (NS_SUCCEEDED(rv))
+          {
+            bool hasMore;
+            while (NS_SUCCEEDED(enumerator->HasMoreElements(&hasMore)) &&
+                   hasMore)
+            {
+              nsCOMPtr<nsISupports> item;
+              enumerator->GetNext(getter_AddRefs(item));
+              nsCOMPtr<nsIMsgFolder> subFolder(do_QueryInterface(item));
+              if (subFolder)
+              {
+                nsCOMPtr<nsIMsgDatabase> subFolderDB;
+                subFolder->GetMsgDatabase(getter_AddRefs(subFolderDB));
+                if (subFolderDB)
+                {
+                  // Copy any messages in this sub-folder of the hidden
+                  // account to the corresponding folder in Local Folders.
+                  RefPtr<nsMsgKeyArray> keys = new nsMsgKeyArray;
+                  rv = subFolderDB->ListAllKeys(keys);
+                  nsCOMPtr<nsIMutableArray> hdrsToCopy(do_CreateInstance(NS_ARRAY_CONTRACTID));
+                  MsgGetHeadersFromKeys(subFolderDB, keys->m_keys, hdrsToCopy);
+                  uint32_t numHdrs = 0;
+                  if (hdrsToCopy)
+                    hdrsToCopy->GetLength(&numHdrs);
+                  if (numHdrs)
+                  {
+                    // Look for a folder with the same name in Local Folders.
+                    nsCOMPtr<nsIMsgFolder> dest;
+                    nsString folderName;
+                    subFolder->GetName(folderName);
+                    localFoldersRoot->GetChildNamed(folderName,
+                                                    getter_AddRefs(dest));
+                    if (dest)
+                      dest->CopyMessages(subFolder, hdrsToCopy, false,
+                                         nullptr, nullptr, false,false);
+                    // Should we copy the folder if the dest doesn't exist?
+                  }
+                }
+              }
+            }
+          }
+        }
+      }
+      rv = acctMgr->FindAccountForServer(localServer, getter_AddRefs(localAccount));
+      NS_ENSURE_SUCCESS(rv, rv);
+      if (!localAccount)
+        return NS_ERROR_NOT_AVAILABLE;
+
+      localAccount->GetKey(aRetVal);
+      // Can't call SetDeferredToAccount because it calls GetDeferredToAccount.
+      return SetCharValue("deferred_to_account", aRetVal);
+    }
+  }
+  return rv;
+}
+
+NS_IMETHODIMP nsPop3IncomingServer::SetDeferredToAccount(const nsACString& aAccountKey)
+{
+  nsCString deferredToAccount;
+  GetDeferredToAccount(deferredToAccount);
+  m_rootMsgFolder = nullptr; // clear this so we'll recalculate it on demand.
+  //Notify listeners who listen to every folder
+
+  nsresult rv =  SetCharValue("deferred_to_account", aAccountKey);
+  NS_ENSURE_SUCCESS(rv, rv);
+  nsCOMPtr<nsIFolderListener> folderListenerManager =
+           do_GetService(NS_MSGMAILSESSION_CONTRACTID, &rv);
+  if (NS_SUCCEEDED(rv))
+  {
+
+    nsCOMPtr<nsIMsgFolder> rootFolder;
+    // use GetRootFolder, because that returns the real
+    // root, not the deferred to root.
+    rv = GetRootFolder(getter_AddRefs(rootFolder));
+    if (rootFolder)
+    {
+      // if isDeferred state has changed, send notification
+      if (aAccountKey.IsEmpty() != deferredToAccount.IsEmpty())
+      {
+        nsCOMPtr <nsIAtom> deferAtom = MsgGetAtom("isDeferred");
+        nsCOMPtr <nsIAtom> canFileAtom = MsgGetAtom("CanFileMessages");
+        folderListenerManager->OnItemBoolPropertyChanged(rootFolder, deferAtom,
+                  !deferredToAccount.IsEmpty(), deferredToAccount.IsEmpty());
+        folderListenerManager->OnItemBoolPropertyChanged(rootFolder, canFileAtom,
+                  deferredToAccount.IsEmpty(), !deferredToAccount.IsEmpty());
+
+        // this hack causes the account manager ds to send notifications to the
+        // xul content builder that make the changed acct appear or disappear
+        // from the folder pane and related menus.
+        nsCOMPtr<nsIMsgAccountManager> acctMgr =
+                            do_GetService(NS_MSGACCOUNTMANAGER_CONTRACTID);
+        if (acctMgr)
+        {
+          acctMgr->NotifyServerUnloaded(this);
+          acctMgr->NotifyServerLoaded(this);
+          // check if this newly deferred to account is the local folders account
+          // and needs to have a newly created INBOX.
+          if (!aAccountKey.IsEmpty())
+          {
+            nsCOMPtr <nsIMsgAccount> account;
+            acctMgr->GetAccount(aAccountKey, getter_AddRefs(account));
+            if (account)
+            {
+              nsCOMPtr <nsIMsgIncomingServer> server;
+              account->GetIncomingServer(getter_AddRefs(server));
+              if (server)
+              {
+                nsCOMPtr <nsILocalMailIncomingServer> incomingLocalServer = do_QueryInterface(server);
+                if (incomingLocalServer)
+                {
+                  nsCOMPtr <nsIMsgFolder> rootFolder;
+                  rv = server->GetRootFolder(getter_AddRefs(rootFolder));
+                  NS_ENSURE_SUCCESS(rv, rv);
+                  // this will fail if it already exists, which is fine.
+                  rootFolder->CreateSubfolder(NS_LITERAL_STRING("Inbox"), nullptr);
+                }
+              }
+            }
+          }
+        }
+      }
+    }
+  }
+  return rv;
+}
+
+//NS_IMPL_GETSET(nsPop3IncomingServer, Authenticated, bool, m_authenticated);
+
+NS_IMETHODIMP nsPop3IncomingServer::GetAuthenticated(bool *aAuthenticated)
+{
+  NS_ENSURE_ARG_POINTER(aAuthenticated);
+  *aAuthenticated = m_authenticated;
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsPop3IncomingServer::SetAuthenticated(bool aAuthenticated)
+{
+  m_authenticated = aAuthenticated;
+  return NS_OK;
+}
+
+nsresult
+nsPop3IncomingServer::GetPop3CapabilityFlags(uint32_t *flags)
+{
+  *flags = m_capabilityFlags;
+  return NS_OK;
+}
+
+nsresult
+nsPop3IncomingServer::SetPop3CapabilityFlags(uint32_t flags)
+{
+  m_capabilityFlags = flags;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPop3IncomingServer::GetRootMsgFolder(nsIMsgFolder **aRootMsgFolder)
+{
+  NS_ENSURE_ARG_POINTER(aRootMsgFolder);
+  nsresult rv = NS_OK;
+  if (!m_rootMsgFolder)
+  {
+    nsCString deferredToAccount;
+    GetDeferredToAccount(deferredToAccount);
+    if (deferredToAccount.IsEmpty())
+    {
+      rv = CreateRootFolder();
+      m_rootMsgFolder = m_rootFolder;
+    }
+    else
+    {
+      nsCOMPtr <nsIMsgAccountManager> accountManager = do_GetService(NS_MSGACCOUNTMANAGER_CONTRACTID, &rv);
+      NS_ENSURE_SUCCESS(rv,rv);
+      nsCOMPtr <nsIMsgAccount> account;
+      rv = accountManager->GetAccount(deferredToAccount, getter_AddRefs(account));
+      NS_ENSURE_SUCCESS(rv,rv);
+      if (account)
+      {
+        nsCOMPtr <nsIMsgIncomingServer> incomingServer;
+        rv = account->GetIncomingServer(getter_AddRefs(incomingServer));
+        NS_ENSURE_SUCCESS(rv,rv);
+        // make sure we're not deferred to ourself...
+        if (incomingServer && incomingServer != this)
+          rv = incomingServer->GetRootMsgFolder(getter_AddRefs(m_rootMsgFolder));
+        else
+          rv = NS_ERROR_FAILURE;
+      }
+    }
+  }
+
+  NS_IF_ADDREF(*aRootMsgFolder = m_rootMsgFolder);
+  return m_rootMsgFolder ? rv : NS_ERROR_FAILURE;
+}
+
+nsresult nsPop3IncomingServer::GetInbox(nsIMsgWindow *msgWindow, nsIMsgFolder **inbox)
+{
+  NS_ENSURE_ARG_POINTER(inbox);
+  nsCOMPtr<nsIMsgFolder> rootFolder;
+  nsresult rv = GetRootMsgFolder(getter_AddRefs(rootFolder));
+  if(NS_SUCCEEDED(rv) && rootFolder)
+  {
+    rootFolder->GetFolderWithFlags(nsMsgFolderFlags::Inbox, inbox);
+  }
+
+  nsCOMPtr<nsIMsgLocalMailFolder> localInbox = do_QueryInterface(*inbox, &rv);
+  if (NS_SUCCEEDED(rv) && localInbox)
+  {
+    nsCOMPtr <nsIMsgDatabase> db;
+    rv = (*inbox)->GetMsgDatabase(getter_AddRefs(db));
+    if (NS_FAILED(rv))
+    {
+      (*inbox)->SetMsgDatabase(nullptr);
+      (void) localInbox->SetCheckForNewMessagesAfterParsing(true);
+      // this will cause a reparse of the mail folder.
+      localInbox->GetDatabaseWithReparse(nullptr, msgWindow, getter_AddRefs(db));
+      rv = NS_MSG_ERROR_FOLDER_SUMMARY_OUT_OF_DATE;
+    }
+  }
+  return rv;
+}
+
+NS_IMETHODIMP nsPop3IncomingServer::PerformBiff(nsIMsgWindow *aMsgWindow)
+{
+  nsresult rv;
+  nsCOMPtr<nsIPop3Service> pop3Service(do_GetService(kCPop3ServiceCID, &rv));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsIMsgFolder> inbox;
+  nsCOMPtr<nsIMsgFolder> rootMsgFolder;
+  nsCOMPtr<nsIUrlListener> urlListener;
+  rv = GetRootMsgFolder(getter_AddRefs(rootMsgFolder));
+  NS_ENSURE_TRUE(rootMsgFolder, NS_ERROR_FAILURE);
+
+  rootMsgFolder->GetFolderWithFlags(nsMsgFolderFlags::Inbox,
+                                    getter_AddRefs(inbox));
+  if (!inbox)
+    return NS_ERROR_FAILURE;
+
+  nsCOMPtr <nsIMsgIncomingServer> server;
+  inbox->GetServer(getter_AddRefs(server));
+
+  server->SetPerformingBiff(true);
+
+  urlListener = do_QueryInterface(inbox);
+
+  bool downloadOnBiff = false;
+  rv = GetDownloadOnBiff(&downloadOnBiff);
+  if (downloadOnBiff)
+  {
+    nsCOMPtr <nsIMsgLocalMailFolder> localInbox = do_QueryInterface(inbox, &rv);
+    if (localInbox && NS_SUCCEEDED(rv))
+    {
+      bool valid = false;
+      nsCOMPtr <nsIMsgDatabase> db;
+      rv = inbox->GetMsgDatabase(getter_AddRefs(db));
+      if (NS_SUCCEEDED(rv) && db)
+        rv = db->GetSummaryValid(&valid);
+      if (NS_SUCCEEDED(rv) && valid)
+        rv = pop3Service->GetNewMail(aMsgWindow, urlListener, inbox, this, nullptr);
+      else
+      {
+        bool isLocked;
+        inbox->GetLocked(&isLocked);
+        if (!isLocked)
+          rv = localInbox->GetDatabaseWithReparse(urlListener, aMsgWindow, getter_AddRefs(db));
+        if (NS_SUCCEEDED(rv))
+          rv = localInbox->SetCheckForNewMessagesAfterParsing(true);
+      }
+    }
+  }
+  else
+    rv = pop3Service->CheckForNewMail(aMsgWindow, urlListener, inbox, this, nullptr);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPop3IncomingServer::SetFlagsOnDefaultMailboxes()
+{
+  nsCOMPtr<nsIMsgFolder> rootFolder;
+  nsresult rv = GetRootFolder(getter_AddRefs(rootFolder));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsIMsgLocalMailFolder> localFolder = do_QueryInterface(rootFolder, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // pop3 gets an inbox, but no queue (unsent messages)
+  localFolder->SetFlagsOnDefaultMailboxes(nsMsgFolderFlags::SpecialUse &
+                                         ~nsMsgFolderFlags::Queue);
+  return NS_OK;
+}
+
+
+NS_IMETHODIMP nsPop3IncomingServer::CreateDefaultMailboxes()
+{
+  nsresult rv = CreateLocalFolder(NS_LITERAL_STRING("Inbox"));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  return CreateLocalFolder(NS_LITERAL_STRING("Trash"));
+}
+
+// override this so we can say that deferred accounts can't have messages
+// filed to them, which will remove them as targets of all the move/copy
+// menu items.
+NS_IMETHODIMP
+nsPop3IncomingServer::GetCanFileMessagesOnServer(bool *aCanFileMessagesOnServer)
+{
+  NS_ENSURE_ARG_POINTER(aCanFileMessagesOnServer);
+
+  nsCString deferredToAccount;
+  GetDeferredToAccount(deferredToAccount);
+  *aCanFileMessagesOnServer = deferredToAccount.IsEmpty();
+  return NS_OK;
+}
+
+
+NS_IMETHODIMP
+nsPop3IncomingServer::GetCanCreateFoldersOnServer(bool *aCanCreateFoldersOnServer)
+{
+  NS_ENSURE_ARG_POINTER(aCanCreateFoldersOnServer);
+
+  nsCString deferredToAccount;
+  GetDeferredToAccount(deferredToAccount);
+  *aCanCreateFoldersOnServer = deferredToAccount.IsEmpty();
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPop3IncomingServer::VerifyLogon(nsIUrlListener *aUrlListener,
+                                  nsIMsgWindow *aMsgWindow, nsIURI **aURL)
+{
+  nsresult rv;
+  nsCOMPtr<nsIPop3Service> pop3Service = do_GetService(kCPop3ServiceCID, &rv);
+  NS_ENSURE_SUCCESS(rv,rv);
+  return pop3Service->VerifyLogon(this, aUrlListener, aMsgWindow, aURL);
+}
+
+NS_IMETHODIMP nsPop3IncomingServer::DownloadMailFromServers(nsIPop3IncomingServer** aServers,
+                              uint32_t aCount,
+                              nsIMsgWindow *aMsgWindow,
+                              nsIMsgFolder *aFolder,
+                              nsIUrlListener *aUrlListener)
+{
+  nsPop3GetMailChainer *getMailChainer = new nsPop3GetMailChainer;
+  NS_ENSURE_TRUE(getMailChainer, NS_ERROR_OUT_OF_MEMORY);
+  getMailChainer->AddRef(); // this object owns itself and releases when done.
+  return getMailChainer->GetNewMailForServers(aServers, aCount, aMsgWindow, aFolder, aUrlListener);
+}
+
+NS_IMETHODIMP nsPop3IncomingServer::GetNewMail(nsIMsgWindow *aMsgWindow,
+                                               nsIUrlListener *aUrlListener,
+                                               nsIMsgFolder *aInbox,
+                                               nsIURI **aResult)
+{
+  nsresult rv;
+  nsCOMPtr<nsIPop3Service> pop3Service = do_GetService(kCPop3ServiceCID, &rv);
+  NS_ENSURE_SUCCESS(rv,rv);
+  return pop3Service->GetNewMail(aMsgWindow, aUrlListener, aInbox, this, aResult);
+}
+
+// user has clicked get new messages on this server. If other servers defer to this server,
+// we need to get new mail for them. But if this server defers to an other server,
+// I think we only get new mail for this server.
+NS_IMETHODIMP
+nsPop3IncomingServer::GetNewMessages(nsIMsgFolder *aFolder, nsIMsgWindow *aMsgWindow,
+                      nsIUrlListener *aUrlListener)
+{
+  nsresult rv;
+
+  nsCOMPtr<nsIPop3Service> pop3Service = do_GetService(kCPop3ServiceCID, &rv);
+  NS_ENSURE_SUCCESS(rv,rv);
+
+  nsCOMPtr <nsIMsgFolder> inbox;
+  rv = GetInbox(aMsgWindow, getter_AddRefs(inbox));
+  NS_ENSURE_SUCCESS(rv, rv);
+  nsCOMPtr <nsIURI> url;
+  nsCOMPtr <nsIMsgIncomingServer> server;
+  nsCOMArray<nsIPop3IncomingServer> deferredServers;
+  nsCString deferredToAccount;
+  GetDeferredToAccount(deferredToAccount);
+
+  if (deferredToAccount.IsEmpty())
+  {
+    aFolder->GetServer(getter_AddRefs(server));
+    GetDeferredServers(server, deferredServers);
+  }
+  if (deferredToAccount.IsEmpty() && !deferredServers.IsEmpty())
+  {
+    nsPop3GetMailChainer *getMailChainer = new nsPop3GetMailChainer;
+    NS_ENSURE_TRUE(getMailChainer, NS_ERROR_OUT_OF_MEMORY);
+    getMailChainer->AddRef(); // this object owns itself and releases when done.
+    deferredServers.InsertElementAt(0, this);
+    return getMailChainer->GetNewMailForServers(deferredServers.Elements(),
+          deferredServers.Length(), aMsgWindow, inbox, aUrlListener);
+  }
+  if (m_runningProtocol)
+    return NS_MSG_FOLDER_BUSY;
+
+  return pop3Service->GetNewMail(aMsgWindow, aUrlListener, inbox, this, getter_AddRefs(url));
+}
+
+NS_IMETHODIMP
+nsPop3IncomingServer::GetDownloadMessagesAtStartup(bool *getMessagesAtStartup)
+{
+  NS_ENSURE_ARG_POINTER(getMessagesAtStartup);
+  // GetMessages is not automatically done for pop servers at startup.
+  // We need to trigger that action. Return true.
+  *getMessagesAtStartup = true;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPop3IncomingServer::GetCanBeDefaultServer(bool *canBeDefaultServer)
+{
+  NS_ENSURE_ARG_POINTER(canBeDefaultServer);
+  *canBeDefaultServer = true;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPop3IncomingServer::GetCanSearchMessages(bool *canSearchMessages)
+{
+  // this will return false if this server is deferred, which is what we want.
+  return GetCanFileMessagesOnServer(canSearchMessages);
+}
+
+NS_IMETHODIMP
+nsPop3IncomingServer::CloseCachedConnections()
+{
+  nsCOMPtr<nsIRequest> channel = do_QueryInterface(m_runningProtocol);
+  if (channel)
+    channel->Cancel(NS_ERROR_ABORT);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPop3IncomingServer::GetOfflineSupportLevel(int32_t *aSupportLevel)
+{
+  NS_ENSURE_ARG_POINTER(aSupportLevel);
+
+  nsresult rv;
+  rv = GetIntValue("offline_support_level", aSupportLevel);
+  if (*aSupportLevel != OFFLINE_SUPPORT_LEVEL_UNDEFINED) return rv;
+
+  // set default value
+  *aSupportLevel = OFFLINE_SUPPORT_LEVEL_NONE;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPop3IncomingServer::SetRunningProtocol(nsIPop3Protocol *aProtocol)
+{
+  NS_ASSERTION(!aProtocol || !m_runningProtocol, "overriding running protocol");
+  m_runningProtocol = aProtocol;
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsPop3IncomingServer::GetRunningProtocol(nsIPop3Protocol **aProtocol)
+{
+  NS_ENSURE_ARG_POINTER(aProtocol);
+  NS_IF_ADDREF(*aProtocol = m_runningProtocol);
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsPop3IncomingServer::AddUidlToMark(const char *aUidl, int32_t aMark)
+{
+  NS_ENSURE_ARG_POINTER(aUidl);
+
+  Pop3UidlEntry *uidlEntry = PR_NEWZAP(Pop3UidlEntry);
+  NS_ENSURE_TRUE(uidlEntry, NS_ERROR_OUT_OF_MEMORY);
+
+  uidlEntry->uidl = strdup(aUidl);
+  if (MOZ_UNLIKELY(!uidlEntry->uidl)) {
+    PR_Free(uidlEntry);
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+
+  uidlEntry->status = (aMark == POP3_DELETE) ? DELETE_CHAR :
+                      (aMark == POP3_FETCH_BODY) ? FETCH_BODY : KEEP;
+  m_uidlsToMark.AppendElement(uidlEntry);
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsPop3IncomingServer::MarkMessages()
+{
+  nsresult rv;
+  if (m_runningProtocol)
+    rv = m_runningProtocol->MarkMessages(&m_uidlsToMark);
+  else
+  {
+    nsCString hostName;
+    nsCString userName;
+    nsCOMPtr<nsIFile> localPath;
+
+    GetLocalPath(getter_AddRefs(localPath));
+
+    GetHostName(hostName);
+    GetUsername(userName);
+    // do it all in one fell swoop
+    rv = nsPop3Protocol::MarkMsgForHost(hostName.get(), userName.get(), localPath, m_uidlsToMark);
+  }
+  uint32_t count = m_uidlsToMark.Length();
+  for (uint32_t i = 0; i < count; i++)
+  {
+    Pop3UidlEntry *ue = m_uidlsToMark[i];
+    PR_Free(ue->uidl);
+    PR_Free(ue);
+  }
+  m_uidlsToMark.Clear();
+  return rv;
+}
+
+NS_IMPL_ISUPPORTS(nsPop3GetMailChainer, nsIUrlListener)
+
+nsPop3GetMailChainer::nsPop3GetMailChainer()
+{
+}
+nsPop3GetMailChainer::~nsPop3GetMailChainer()
+{
+}
+
+nsresult nsPop3GetMailChainer::GetNewMailForServers(nsIPop3IncomingServer** servers,
+                                uint32_t count, nsIMsgWindow *msgWindow,
+                                nsIMsgFolder *folderToDownloadTo, nsIUrlListener *listener)
+{
+  NS_ENSURE_ARG_POINTER(folderToDownloadTo);
+
+  m_serversToGetNewMailFor.AppendElements(servers, count);
+  m_folderToDownloadTo = folderToDownloadTo;
+  m_downloadingMsgWindow = msgWindow;
+  m_listener = listener;
+  nsCOMPtr <nsIMsgDatabase> destFolderDB;
+
+  nsresult rv = folderToDownloadTo->GetMsgDatabase(getter_AddRefs(destFolderDB));
+  if (NS_FAILED(rv) || !destFolderDB)
+  {
+    nsCOMPtr <nsIMsgLocalMailFolder> localFolder = do_QueryInterface(folderToDownloadTo);
+    if (localFolder)
+    {
+      localFolder->GetDatabaseWithReparse(this, msgWindow, getter_AddRefs(destFolderDB));
+      return NS_OK;
+    }
+  }
+  return RunNextGetNewMail();
+}
+
+NS_IMETHODIMP
+nsPop3GetMailChainer::OnStartRunningUrl(nsIURI *url)
+{
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPop3GetMailChainer::OnStopRunningUrl(nsIURI *aUrl, nsresult aExitCode)
+{
+  return RunNextGetNewMail();
+}
+
+nsresult nsPop3GetMailChainer::RunNextGetNewMail()
+{
+  nsresult rv;
+  uint32_t numServersLeft = m_serversToGetNewMailFor.Count();
+
+  for (; numServersLeft > 0;)
+  {
+    nsCOMPtr<nsIPop3IncomingServer> popServer(m_serversToGetNewMailFor[0]);
+    m_serversToGetNewMailFor.RemoveObjectAt(0);
+    numServersLeft--;
+    if (popServer)
+    {
+      bool deferGetNewMail = false;
+      nsCOMPtr <nsIMsgIncomingServer> downloadingToServer;
+      m_folderToDownloadTo->GetServer(getter_AddRefs(downloadingToServer));
+      popServer->GetDeferGetNewMail(&deferGetNewMail);
+      nsCOMPtr<nsIMsgIncomingServer> server = do_QueryInterface(popServer);
+      nsCOMPtr<nsIPop3Protocol> protocol;
+      popServer->GetRunningProtocol(getter_AddRefs(protocol));
+      if ((deferGetNewMail || downloadingToServer == server) && !protocol)
+      {
+        // have to call routine that just gets mail for one server,
+        // and ignores deferred servers...
+        if (server)
+        {
+          nsCOMPtr <nsIURI> url;
+          nsCOMPtr<nsIPop3Service> pop3Service = do_GetService(kCPop3ServiceCID, &rv);
+          NS_ENSURE_SUCCESS(rv,rv);
+          return pop3Service->GetNewMail(m_downloadingMsgWindow, this, m_folderToDownloadTo, popServer, getter_AddRefs(url));
+        }
+      }
+    }
+  }
+  rv = m_listener ? m_listener->OnStopRunningUrl(nullptr, NS_OK) : NS_OK;
+  Release(); // release ref to ourself.
+  return rv;
+}
diff --git a/mailnews/local/src/nsPop3IncomingServer.h b/mailnews/local/src/nsPop3IncomingServer.h
new file mode 100644
index 000000000..3c98f3bd2
--- /dev/null
+++ b/mailnews/local/src/nsPop3IncomingServer.h
@@ -0,0 +1,57 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef __nsPop3IncomingServer_h
+#define __nsPop3IncomingServer_h
+
+#include "mozilla/Attributes.h"
+#include "msgCore.h"
+#include "nsIPop3IncomingServer.h"
+#include "nsILocalMailIncomingServer.h"
+#include "nsMsgIncomingServer.h"
+#include "nsIPop3Protocol.h"
+#include "nsIMsgWindow.h"
+#include "nsMailboxServer.h"
+
+/* get some implementation from nsMsgIncomingServer */
+class nsPop3IncomingServer : public nsMailboxServer,
+                             public nsIPop3IncomingServer,
+                             public nsILocalMailIncomingServer
+
+{
+public:
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_NSIPOP3INCOMINGSERVER
+  NS_DECL_NSILOCALMAILINCOMINGSERVER
+
+  nsPop3IncomingServer();
+
+  NS_IMETHOD PerformBiff(nsIMsgWindow *aMsgWindow) override;
+  NS_IMETHOD GetDownloadMessagesAtStartup(bool *getMessages) override;
+  NS_IMETHOD GetCanBeDefaultServer(bool *canBeDefaultServer) override;
+  NS_IMETHOD GetCanSearchMessages(bool *canSearchMessages) override;
+  NS_IMETHOD GetOfflineSupportLevel(int32_t *aSupportLevel) override;
+  NS_IMETHOD CloseCachedConnections() override;
+  NS_IMETHOD GetRootMsgFolder(nsIMsgFolder **aRootMsgFolder) override;
+  NS_IMETHOD GetCanFileMessagesOnServer(bool *aCanFileMessagesOnServer) override;
+  NS_IMETHOD GetCanCreateFoldersOnServer(bool *aCanCreateFoldersOnServer) override;
+  NS_IMETHOD VerifyLogon(nsIUrlListener *aUrlListener, nsIMsgWindow *aMsgWindow,
+                         nsIURI **aURL) override;
+  NS_IMETHOD GetNewMessages(nsIMsgFolder *aFolder, nsIMsgWindow *aMsgWindow,
+                            nsIUrlListener *aUrlListener) override;
+
+protected:
+  virtual ~nsPop3IncomingServer();
+  nsresult GetInbox(nsIMsgWindow *msgWindow, nsIMsgFolder **inbox);
+
+private:
+  uint32_t m_capabilityFlags;
+  bool m_authenticated;
+  nsCOMPtr <nsIPop3Protocol> m_runningProtocol;
+  nsCOMPtr <nsIMsgFolder> m_rootMsgFolder;
+  nsTArray<Pop3UidlEntry*> m_uidlsToMark;
+};
+
+#endif
diff --git a/mailnews/local/src/nsPop3Protocol.cpp b/mailnews/local/src/nsPop3Protocol.cpp
new file mode 100644
index 000000000..825f45ab3
--- /dev/null
+++ b/mailnews/local/src/nsPop3Protocol.cpp
@@ -0,0 +1,4176 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This Original Code has been modified by IBM Corporation. Modifications made by IBM
+ * described herein are Copyright (c) International Business Machines Corporation, 2000.
+ * Modifications to Mozilla code or documentation identified per MPL Section 3.3
+ *
+ * Jason Eager <jce2@po.cwru.edu>
+ *
+ * Date             Modified by     Description of modification
+ * 04/20/2000       IBM Corp.      OS/2 VisualAge build.
+ * 06/07/2000       Jason Eager    Added check for out of disk space
+ */
+
+#include "nscore.h"
+#include "msgCore.h"    // precompiled header...
+#include "nsNetUtil.h"
+#include "nspr.h"
+#include "plbase64.h"
+#include "nsIMsgMailNewsUrl.h"
+#include "nsISafeOutputStream.h"
+#include "nsPop3Protocol.h"
+#include "MailNewsTypes.h"
+#include "nsStringGlue.h"
+#include "nsIPrompt.h"
+#include "nsIMsgIncomingServer.h"
+#include "nsIMsgPluggableStore.h"
+#include "nsTextFormatter.h"
+#include "nsCOMPtr.h"
+#include "nsIMsgWindow.h"
+#include "nsIMsgFolder.h" // TO include biffState enum. Change to bool later...
+#include "nsIMsgLocalMailFolder.h"
+#include "nsIDocShell.h"
+#include "nsMsgUtils.h"
+#include "nsISocketTransport.h"
+#include "nsISSLSocketControl.h"
+#include "nsILineInputStream.h"
+#include "nsIInterfaceRequestor.h"
+#include "nsMsgMessageFlags.h"
+#include "nsMsgBaseCID.h"
+#include "nsIProxyInfo.h"
+#include "nsCRT.h"
+#include "mozilla/Services.h"
+#include "mozilla/Logging.h"
+#include "mozilla/Attributes.h"
+
+using namespace mozilla;
+
+PRLogModuleInfo *POP3LOGMODULE = nullptr;
+#define POP3LOG(str) "%s: [this=%p] " str, POP3LOGMODULE->name, this
+
+static int
+net_pop3_remove_messages_marked_delete(PLHashEntry* he,
+                                       int msgindex,
+                                       void *arg)
+{
+  Pop3UidlEntry *uidlEntry = (Pop3UidlEntry *) he->value;
+  return (uidlEntry->status == DELETE_CHAR)
+    ? HT_ENUMERATE_REMOVE : HT_ENUMERATE_NEXT;
+}
+
+uint32_t TimeInSecondsFromPRTime(PRTime prTime)
+{
+  return (uint32_t)(prTime / PR_USEC_PER_SEC);
+}
+
+static void
+put_hash(PLHashTable* table, const char* key, char value, uint32_t dateReceived)
+{
+  // don't put not used slots or empty uid into hash
+  if (key && *key)
+  {
+    Pop3UidlEntry* tmp = PR_NEWZAP(Pop3UidlEntry);
+    if (tmp)
+    {
+      tmp->uidl = PL_strdup(key);
+      if (tmp->uidl)
+      {
+        tmp->dateReceived = dateReceived;
+        tmp->status = value;
+        PL_HashTableAdd(table, (const void *)tmp->uidl, (void*) tmp);
+      }
+      else
+        PR_Free(tmp);
+    }
+  }
+}
+
+static int
+net_pop3_copy_hash_entries(PLHashEntry* he, int msgindex, void *arg)
+{
+  Pop3UidlEntry *uidlEntry = (Pop3UidlEntry *) he->value;
+  put_hash((PLHashTable *) arg, uidlEntry->uidl, uidlEntry->status, uidlEntry->dateReceived);
+  return HT_ENUMERATE_NEXT;
+}
+
+static void *
+AllocUidlTable(void * /* pool */, size_t size)
+{
+  return PR_MALLOC(size);
+}
+
+static void
+FreeUidlTable(void * /* pool */, void *item)
+{
+    PR_Free(item);
+}
+
+static PLHashEntry *
+AllocUidlInfo(void *pool, const void *key)
+{
+    return PR_NEWZAP(PLHashEntry);
+}
+
+static void
+FreeUidlInfo(void * /* pool */, PLHashEntry *he, unsigned flag)
+{
+  if (flag == HT_FREE_ENTRY)
+  {
+    Pop3UidlEntry *uidlEntry = (Pop3UidlEntry *) he->value;
+    if (uidlEntry)
+    {
+      PR_Free(uidlEntry->uidl);
+      PR_Free(uidlEntry);
+    }
+    PR_Free(he);
+  }
+}
+
+static PLHashAllocOps gHashAllocOps = {
+    AllocUidlTable, FreeUidlTable,
+    AllocUidlInfo, FreeUidlInfo
+};
+
+
+static Pop3UidlHost*
+net_pop3_load_state(const char* searchhost,
+                    const char* searchuser,
+                    nsIFile *mailDirectory)
+{
+  Pop3UidlHost* result = nullptr;
+  Pop3UidlHost* current = nullptr;
+  Pop3UidlHost* tmp;
+
+  result = PR_NEWZAP(Pop3UidlHost);
+  if (!result)
+    return nullptr;
+  result->host = PL_strdup(searchhost);
+  result->user = PL_strdup(searchuser);
+  result->hash = PL_NewHashTable(20, PL_HashString, PL_CompareStrings, PL_CompareValues, &gHashAllocOps, nullptr);
+
+  if (!result->host || !result->user || !result->hash)
+  {
+    PR_Free(result->host);
+    PR_Free(result->user);
+    if (result->hash)
+      PL_HashTableDestroy(result->hash);
+    PR_Free(result);
+    return nullptr;
+  }
+
+  nsCOMPtr <nsIFile> popState;
+  mailDirectory->Clone(getter_AddRefs(popState));
+  if (!popState)
+    return nullptr;
+  popState->AppendNative(NS_LITERAL_CSTRING("popstate.dat"));
+
+  nsCOMPtr<nsIInputStream> fileStream;
+  nsresult rv = NS_NewLocalFileInputStream(getter_AddRefs(fileStream), popState);
+  NS_ENSURE_SUCCESS(rv, result);
+
+  nsCOMPtr<nsILineInputStream> lineInputStream(do_QueryInterface(fileStream, &rv));
+  NS_ENSURE_SUCCESS(rv, result);
+
+  bool more = true;
+  nsCString line;
+
+  while (more && NS_SUCCEEDED(rv))
+  {
+    lineInputStream->ReadLine(line, &more);
+    if (line.IsEmpty())
+      continue;
+    char firstChar = line.CharAt(0);
+    if (firstChar == '#')
+      continue;
+    if (firstChar == '*') {
+      /* It's a host&user line. */
+      current = nullptr;
+      char *lineBuf = line.BeginWriting() + 1; // ok because we know the line isn't empty
+      char *host = NS_strtok(" \t\r\n", &lineBuf);
+      /* without space to also get realnames - see bug 225332 */
+      char *user = NS_strtok("\t\r\n", &lineBuf);
+      if (!host || !user)
+        continue;
+      for (tmp = result ; tmp ; tmp = tmp->next)
+      {
+        if (!strcmp(host, tmp->host) && !strcmp(user, tmp->user))
+        {
+          current = tmp;
+          break;
+        }
+      }
+      if (!current)
+      {
+        current = PR_NEWZAP(Pop3UidlHost);
+        if (current)
+        {
+          current->host = strdup(host);
+          current->user = strdup(user);
+          current->hash = PL_NewHashTable(20, PL_HashString, PL_CompareStrings, PL_CompareValues, &gHashAllocOps, nullptr);
+          if (!current->host || !current->user || !current->hash)
+          {
+            PR_Free(current->host);
+            PR_Free(current->user);
+            if (current->hash)
+              PL_HashTableDestroy(current->hash);
+            PR_Free(current);
+          }
+          else
+          {
+            current->next = result->next;
+            result->next = current;
+          }
+        }
+      }
+    }
+    else
+    {
+      /* It's a line with a UIDL on it. */
+      if (current)
+      {
+        for (int32_t pos = line.FindChar('\t'); pos != -1; pos = line.FindChar('\t', pos))
+          line.Replace(pos, 1, ' ');
+
+        nsTArray<nsCString> lineElems;
+        ParseString(line, ' ', lineElems);
+        if (lineElems.Length() < 2)
+          continue;
+        nsCString *flags = &lineElems[0];
+        nsCString *uidl = &lineElems[1];
+        uint32_t dateReceived = TimeInSecondsFromPRTime(PR_Now()); // if we don't find a date str, assume now.
+        if (lineElems.Length() > 2)
+          dateReceived = atoi(lineElems[2].get());
+        if (!flags->IsEmpty() && !uidl->IsEmpty())
+        {
+          char flag = flags->CharAt(0);
+          if ((flag == KEEP) || (flag == DELETE_CHAR) ||
+            (flag == TOO_BIG) || (flag == FETCH_BODY))
+          {
+            put_hash(current->hash, uidl->get(), flag, dateReceived);
+          }
+          else
+          {
+            NS_ASSERTION(false, "invalid flag in popstate.dat");
+          }
+        }
+      }
+    }
+  }
+  fileStream->Close();
+
+  return result;
+}
+
+static int
+hash_clear_mapper(PLHashEntry* he, int msgindex, void* arg)
+{
+  Pop3UidlEntry *uidlEntry = (Pop3UidlEntry *) he->value;
+  PR_Free(uidlEntry->uidl);
+  PR_Free(uidlEntry);
+  he->value = nullptr;
+
+  return HT_ENUMERATE_REMOVE;
+}
+
+static int
+hash_empty_mapper(PLHashEntry* he, int msgindex, void* arg)
+{
+  *((bool*) arg) = false;
+  return HT_ENUMERATE_STOP;
+}
+
+static bool
+hash_empty(PLHashTable* hash)
+{
+  bool result = true;
+  PL_HashTableEnumerateEntries(hash, hash_empty_mapper, (void *)&result);
+  return result;
+}
+
+
+static int
+net_pop3_write_mapper(PLHashEntry* he, int msgindex, void* arg)
+{
+  nsIOutputStream* file = (nsIOutputStream*) arg;
+  Pop3UidlEntry *uidlEntry = (Pop3UidlEntry *) he->value;
+  NS_ASSERTION((uidlEntry->status == KEEP) ||
+    (uidlEntry->status == DELETE_CHAR) ||
+    (uidlEntry->status == FETCH_BODY) ||
+    (uidlEntry->status == TOO_BIG), "invalid status");
+  char* tmpBuffer = PR_smprintf("%c %s %d" MSG_LINEBREAK, uidlEntry->status, (char*)
+    uidlEntry->uidl, uidlEntry->dateReceived);
+  PR_ASSERT(tmpBuffer);
+  uint32_t numBytesWritten;
+  file->Write(tmpBuffer, strlen(tmpBuffer), &numBytesWritten);
+  PR_Free(tmpBuffer);
+  return HT_ENUMERATE_NEXT;
+}
+
+static int
+net_pop3_delete_old_msgs_mapper(PLHashEntry* he, int msgindex, void* arg)
+{
+  PRTime cutOffDate = (PRTime) arg;
+  Pop3UidlEntry *uidlEntry = (Pop3UidlEntry *) he->value;
+  if (uidlEntry->dateReceived < cutOffDate)
+    uidlEntry->status = DELETE_CHAR; // mark for deletion
+  return HT_ENUMERATE_NEXT;
+}
+
+static void
+net_pop3_write_state(Pop3UidlHost* host, nsIFile *mailDirectory)
+{
+  int32_t len = 0;
+  nsCOMPtr <nsIFile> popState;
+
+  mailDirectory->Clone(getter_AddRefs(popState));
+  if (!popState)
+    return;
+  popState->AppendNative(NS_LITERAL_CSTRING("popstate.dat"));
+
+  nsCOMPtr<nsIOutputStream> fileOutputStream;
+  nsresult rv = MsgNewSafeBufferedFileOutputStream(getter_AddRefs(fileOutputStream), popState, -1, 00600);
+  if (NS_FAILED(rv))
+    return;
+
+  const char tmpBuffer[] =
+    "# POP3 State File" MSG_LINEBREAK
+    "# This is a generated file!  Do not edit." MSG_LINEBREAK
+    MSG_LINEBREAK;
+
+  uint32_t numBytesWritten;
+  fileOutputStream->Write(tmpBuffer, strlen(tmpBuffer), &numBytesWritten);
+
+  for (; host && (len >= 0); host = host->next)
+  {
+    if (!hash_empty(host->hash))
+    {
+      fileOutputStream->Write("*", 1, &numBytesWritten);
+      fileOutputStream->Write(host->host, strlen(host->host), &numBytesWritten);
+      fileOutputStream->Write(" ", 1, &numBytesWritten);
+      fileOutputStream->Write(host->user, strlen(host->user), &numBytesWritten);
+      fileOutputStream->Write(MSG_LINEBREAK, MSG_LINEBREAK_LEN, &numBytesWritten);
+      PL_HashTableEnumerateEntries(host->hash, net_pop3_write_mapper, (void *)fileOutputStream);
+    }
+  }
+  nsCOMPtr<nsISafeOutputStream> safeStream = do_QueryInterface(fileOutputStream);
+  NS_ASSERTION(safeStream, "expected a safe output stream!");
+  if (safeStream) {
+    rv = safeStream->Finish();
+    if (NS_FAILED(rv)) {
+      NS_WARNING("failed to save pop state! possible data loss");
+    }
+  }
+}
+
+static void
+net_pop3_free_state(Pop3UidlHost* host)
+{
+  Pop3UidlHost* h;
+  while (host)
+  {
+    h = host->next;
+    PR_Free(host->host);
+    PR_Free(host->user);
+    PL_HashTableDestroy(host->hash);
+    PR_Free(host);
+    host = h;
+  }
+}
+
+/*
+Look for a specific UIDL string in our hash tables, if we have it then we need
+to mark the message for deletion so that it can be deleted later. If the uidl of the
+message is not found, then the message was downloaded completely and already deleted
+from the server. So this only applies to messages kept on the server or too big
+for download. */
+/* static */
+void nsPop3Protocol::MarkMsgInHashTable(PLHashTable *hashTable, const Pop3UidlEntry *uidlE, bool *changed)
+{
+  if (uidlE->uidl)
+  {
+    Pop3UidlEntry *uidlEntry = (Pop3UidlEntry *) PL_HashTableLookup(hashTable, uidlE->uidl);
+    if (uidlEntry)
+    {
+      if (uidlEntry->status != uidlE->status)
+      {
+        uidlEntry->status = uidlE->status;
+        *changed = true;
+      }
+    }
+  }
+}
+
+/* static */
+nsresult
+nsPop3Protocol::MarkMsgForHost(const char *hostName, const char *userName,
+                                      nsIFile *mailDirectory,
+                                       nsTArray<Pop3UidlEntry*> &UIDLArray)
+{
+  if (!hostName || !userName || !mailDirectory)
+    return NS_ERROR_NULL_POINTER;
+
+  Pop3UidlHost *uidlHost = net_pop3_load_state(hostName, userName, mailDirectory);
+  if (!uidlHost)
+    return NS_ERROR_OUT_OF_MEMORY;
+
+  bool changed = false;
+
+  uint32_t count = UIDLArray.Length();
+  for (uint32_t i = 0; i < count; i++)
+  {
+    MarkMsgInHashTable(uidlHost->hash, UIDLArray[i], &changed);
+  }
+
+  if (changed)
+    net_pop3_write_state(uidlHost, mailDirectory);
+  net_pop3_free_state(uidlHost);
+  return NS_OK;
+}
+
+
+
+NS_IMPL_ADDREF_INHERITED(nsPop3Protocol, nsMsgProtocol)
+NS_IMPL_RELEASE_INHERITED(nsPop3Protocol, nsMsgProtocol)
+
+
+
+NS_INTERFACE_MAP_BEGIN(nsPop3Protocol)
+  NS_INTERFACE_MAP_ENTRY(nsIPop3Protocol)
+  NS_INTERFACE_MAP_ENTRY(nsIMsgAsyncPromptListener)
+NS_INTERFACE_MAP_END_INHERITING(nsMsgProtocol)
+
+// nsPop3Protocol class implementation
+
+nsPop3Protocol::nsPop3Protocol(nsIURI* aURL)
+: nsMsgProtocol(aURL),
+  m_bytesInMsgReceived(0),
+  m_totalFolderSize(0),
+  m_totalDownloadSize(0),
+  m_totalBytesReceived(0),
+  m_lineStreamBuffer(nullptr),
+  m_pop3ConData(nullptr)
+{
+}
+
+nsresult nsPop3Protocol::Initialize(nsIURI * aURL)
+{
+  nsresult rv = NS_OK;
+  if (!POP3LOGMODULE)
+    POP3LOGMODULE = PR_NewLogModule("POP3");
+
+  MOZ_LOG(POP3LOGMODULE, LogLevel::Debug, (POP3LOG("Initialize()")));
+
+  m_pop3ConData = (Pop3ConData *)PR_NEWZAP(Pop3ConData);
+  if(!m_pop3ConData)
+    return NS_ERROR_OUT_OF_MEMORY;
+
+  m_totalBytesReceived = 0;
+  m_bytesInMsgReceived = 0;
+  m_totalFolderSize = 0;
+  m_totalDownloadSize = 0;
+  m_totalBytesReceived = 0;
+  m_tlsEnabled = false;
+  m_socketType = nsMsgSocketType::trySTARTTLS;
+  m_prefAuthMethods = POP3_AUTH_MECH_UNDEFINED;
+  m_failedAuthMethods = 0;
+  m_password_already_sent = false;
+  m_currentAuthMethod = POP3_AUTH_MECH_UNDEFINED;
+  m_needToRerunUrl = false;
+
+  if (aURL)
+  {
+    // extract out message feedback if there is any.
+    nsCOMPtr<nsIMsgMailNewsUrl> mailnewsUrl = do_QueryInterface(aURL);
+    if (mailnewsUrl)
+    {
+      nsCOMPtr<nsIMsgIncomingServer> server;
+      mailnewsUrl->GetServer(getter_AddRefs(server));
+      NS_ENSURE_TRUE(server, NS_MSG_INVALID_OR_MISSING_SERVER);
+
+      rv = server->GetSocketType(&m_socketType);
+      NS_ENSURE_SUCCESS(rv,rv);
+
+      int32_t authMethod = 0;
+      rv = server->GetAuthMethod(&authMethod);
+      NS_ENSURE_SUCCESS(rv,rv);
+      InitPrefAuthMethods(authMethod);
+
+      m_pop3Server = do_QueryInterface(server);
+      if (m_pop3Server)
+        m_pop3Server->GetPop3CapabilityFlags(&m_pop3ConData->capability_flags);
+    }
+
+    m_url = do_QueryInterface(aURL);
+
+    // When we are making a secure connection, we need to make sure that we
+    // pass an interface requestor down to the socket transport so that PSM can
+    // retrieve a nsIPrompt instance if needed.
+    nsCOMPtr<nsIInterfaceRequestor> ir;
+    if (m_socketType != nsMsgSocketType::plain)
+    {
+      nsCOMPtr<nsIMsgWindow> msgwin;
+      mailnewsUrl->GetMsgWindow(getter_AddRefs(msgwin));
+      if (!msgwin)
+        GetTopmostMsgWindow(getter_AddRefs(msgwin));
+      if (msgwin)
+      {
+        nsCOMPtr<nsIDocShell> docshell;
+        msgwin->GetRootDocShell(getter_AddRefs(docshell));
+        ir = do_QueryInterface(docshell);
+        nsCOMPtr<nsIInterfaceRequestor> notificationCallbacks;
+        msgwin->GetNotificationCallbacks(getter_AddRefs(notificationCallbacks));
+        if (notificationCallbacks)
+        {
+          nsCOMPtr<nsIInterfaceRequestor> aggregrateIR;
+          MsgNewInterfaceRequestorAggregation(notificationCallbacks, ir, getter_AddRefs(aggregrateIR));
+          ir = aggregrateIR;
+        }
+      }
+    }
+
+    int32_t port = 0;
+    nsCString hostName;
+    aURL->GetPort(&port);
+    nsCOMPtr<nsIMsgIncomingServer> server = do_QueryInterface(m_pop3Server);
+    if (server)
+      server->GetRealHostName(hostName);
+
+    nsCOMPtr<nsIProxyInfo> proxyInfo;
+    rv = MsgExamineForProxy(this, getter_AddRefs(proxyInfo));
+    if (NS_FAILED(rv)) proxyInfo = nullptr;
+
+    const char *connectionType = nullptr;
+    if (m_socketType == nsMsgSocketType::SSL)
+      connectionType = "ssl";
+    else if (m_socketType == nsMsgSocketType::trySTARTTLS ||
+          m_socketType == nsMsgSocketType::alwaysSTARTTLS)
+        connectionType = "starttls";
+
+    rv = OpenNetworkSocketWithInfo(hostName.get(), port, connectionType, proxyInfo, ir);
+    if (NS_FAILED(rv) && m_socketType == nsMsgSocketType::trySTARTTLS)
+    {
+      m_socketType = nsMsgSocketType::plain;
+      rv = OpenNetworkSocketWithInfo(hostName.get(), port, nullptr, proxyInfo, ir);
+    }
+
+    if(NS_FAILED(rv))
+      return rv;
+  } // if we got a url...
+
+  m_lineStreamBuffer = new nsMsgLineStreamBuffer(OUTPUT_BUFFER_SIZE, true);
+  if(!m_lineStreamBuffer)
+    return NS_ERROR_OUT_OF_MEMORY;
+
+  nsCOMPtr<nsIStringBundleService> bundleService =
+    mozilla::services::GetStringBundleService();
+  NS_ENSURE_TRUE(bundleService, NS_ERROR_UNEXPECTED);
+  return bundleService->CreateBundle("chrome://messenger/locale/localMsgs.properties", getter_AddRefs(mLocalBundle));
+}
+
+nsPop3Protocol::~nsPop3Protocol()
+{
+  Cleanup();
+  MOZ_LOG(POP3LOGMODULE, LogLevel::Debug, (POP3LOG("~nsPop3Protocol()")));
+}
+
+void nsPop3Protocol::Cleanup()
+{
+  if (m_pop3ConData->newuidl)
+  {
+    PL_HashTableDestroy(m_pop3ConData->newuidl);
+    m_pop3ConData->newuidl = nullptr;
+  }
+
+  net_pop3_free_state(m_pop3ConData->uidlinfo);
+
+  FreeMsgInfo();
+  PR_Free(m_pop3ConData->only_uidl);
+  PR_Free(m_pop3ConData);
+
+  delete m_lineStreamBuffer;
+  m_lineStreamBuffer = nullptr;
+}
+
+void nsPop3Protocol::SetCapFlag(uint32_t flag)
+{
+    m_pop3ConData->capability_flags |= flag;
+}
+
+void nsPop3Protocol::ClearCapFlag(uint32_t flag)
+{
+    m_pop3ConData->capability_flags &= ~flag;
+}
+
+bool nsPop3Protocol::TestCapFlag(uint32_t flag)
+{
+    return m_pop3ConData->capability_flags & flag;
+}
+
+uint32_t nsPop3Protocol::GetCapFlags()
+{
+    return m_pop3ConData->capability_flags;
+}
+
+nsresult nsPop3Protocol::FormatCounterString(const nsString &stringName,
+                                             uint32_t count1,
+                                             uint32_t count2,
+                                             nsString &resultString)
+{
+  nsAutoString count1String;
+  count1String.AppendInt(count1);
+
+  nsAutoString count2String;
+  count2String.AppendInt(count2);
+
+  const char16_t *formatStrings[] = {
+    count1String.get(),
+    count2String.get()
+  };
+
+  return mLocalBundle->FormatStringFromName(stringName.get(),
+                                            formatStrings, 2,
+                                            getter_Copies(resultString));
+}
+
+void nsPop3Protocol::UpdateStatus(const char16_t *aStatusName)
+{
+  nsString statusMessage;
+  mLocalBundle->GetStringFromName(aStatusName,
+                                  getter_Copies(statusMessage));
+  UpdateStatusWithString(statusMessage.get());
+}
+
+void nsPop3Protocol::UpdateStatusWithString(const char16_t *aStatusString)
+{
+    if (mProgressEventSink)
+    {
+      mozilla::DebugOnly<nsresult> rv =
+        mProgressEventSink->OnStatus(this, m_channelContext,
+                                     NS_OK, aStatusString); // XXX i18n message
+      NS_ASSERTION(NS_SUCCEEDED(rv), "dropping error result");
+    }
+}
+
+void nsPop3Protocol::UpdateProgressPercent(int64_t totalDone, int64_t total)
+{
+  if (mProgressEventSink)
+    mProgressEventSink->OnProgress(this, m_channelContext, totalDone, total);
+}
+
+// note:  SetUsername() expects an unescaped string
+// do not pass in an escaped string
+void nsPop3Protocol::SetUsername(const char* name)
+{
+  NS_ASSERTION(name, "no name specified!");
+    if (name)
+      m_username = name;
+}
+
+nsresult nsPop3Protocol::RerunUrl()
+{
+  nsCOMPtr<nsIURI> url = do_QueryInterface(m_url);
+  ClearFlag(POP3_PASSWORD_FAILED);
+  m_pop3Server->SetRunningProtocol(nullptr);
+  Cleanup();
+  return LoadUrl(url, nullptr);
+}
+
+Pop3StatesEnum nsPop3Protocol::GetNextPasswordObtainState()
+{
+  switch (m_pop3ConData->next_state)
+  {
+  case POP3_OBTAIN_PASSWORD_EARLY:
+    return POP3_FINISH_OBTAIN_PASSWORD_EARLY;
+  case POP3_SEND_USERNAME:
+  case POP3_OBTAIN_PASSWORD_BEFORE_USERNAME:
+    return POP3_FINISH_OBTAIN_PASSWORD_BEFORE_USERNAME;
+  case POP3_SEND_PASSWORD:
+  case POP3_OBTAIN_PASSWORD_BEFORE_PASSWORD:
+    return POP3_FINISH_OBTAIN_PASSWORD_BEFORE_PASSWORD;
+  default:
+    // Should never get here.
+    NS_NOTREACHED("Invalid next_state in GetNextPasswordObtainState");
+  }
+  return POP3_ERROR_DONE;
+}
+
+nsresult nsPop3Protocol::StartGetAsyncPassword(Pop3StatesEnum aNextState)
+{
+  nsresult rv;
+
+  // Try and avoid going async if possible - if we haven't got into a password
+  // failure state and the server has a password stored for this session, then
+  // use it.
+  if (!TestFlag(POP3_PASSWORD_FAILED))
+  {
+    nsCOMPtr<nsIMsgIncomingServer> server =
+      do_QueryInterface(m_pop3Server, &rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    rv = server->GetPassword(m_passwordResult);
+    if (NS_SUCCEEDED(rv) && !m_passwordResult.IsEmpty())
+    {
+      m_pop3ConData->next_state = GetNextPasswordObtainState();
+      return NS_OK;
+    }
+  }
+
+  // We're now going to need to do something that will end up with us either
+  // poking the login manger or prompting the user. We need to ensure we only
+  // do one prompt at a time (and loging manager could cause a master password
+  // prompt), so we need to use the async prompter.
+  nsCOMPtr<nsIMsgAsyncPrompter> asyncPrompter =
+    do_GetService(NS_MSGASYNCPROMPTER_CONTRACTID, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  m_pop3ConData->next_state = aNextState;
+
+  // Although we're not actually pausing for a read, we'll do so anyway to let
+  // the async prompt run. Once it is our turn again we'll call back into
+  // ProcessProtocolState.
+  m_pop3ConData->pause_for_read = true;
+
+  nsCString server("unknown");
+  m_url->GetPrePath(server);
+
+  rv = asyncPrompter->QueueAsyncAuthPrompt(server, false, this);
+  // Explict NS_ENSURE_SUCCESS for debug purposes as errors tend to get
+  // hidden.
+  NS_ENSURE_SUCCESS(rv, rv);
+  return rv;
+}
+
+NS_IMETHODIMP nsPop3Protocol::OnPromptStart(bool *aResult)
+{
+  MOZ_LOG(POP3LOGMODULE, LogLevel::Debug, (POP3LOG("OnPromptStart()")));
+
+  *aResult = false;
+
+  nsresult rv;
+  nsCOMPtr<nsIMsgIncomingServer> server = do_QueryInterface(m_pop3Server, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsAutoCString passwordResult;
+
+  // pass the failed password into the password prompt so that
+  // it will be pre-filled, in case it failed because of a
+  // server problem and not because it was wrong.
+  if (!m_lastPasswordSent.IsEmpty())
+    passwordResult = m_lastPasswordSent;
+
+  // Set up some items that we're going to need for the prompting.
+  nsCOMPtr<nsIMsgMailNewsUrl> mailnewsUrl = do_QueryInterface(m_url, &rv);
+  nsCOMPtr<nsIMsgWindow> msgWindow;
+  if (mailnewsUrl)
+    mailnewsUrl->GetMsgWindow(getter_AddRefs(msgWindow));
+
+  nsCString userName;
+  server->GetRealUsername(userName);
+
+  nsCString hostName;
+  server->GetRealHostName(hostName);
+
+  nsString passwordPrompt;
+  NS_ConvertUTF8toUTF16 userNameUTF16(userName);
+  NS_ConvertUTF8toUTF16 hostNameUTF16(hostName);
+  const char16_t* passwordParams[] = { userNameUTF16.get(),
+                                        hostNameUTF16.get() };
+
+  // if the last prompt got us a bad password then show a special dialog
+  if (TestFlag(POP3_PASSWORD_FAILED))
+  {
+    // Biff case (no msgWindow) shouldn't cause prompts or passwords to get forgotten at all
+    // TODO shouldn't we skip the new password prompt below as well for biff? Just exit here?
+    if (msgWindow)
+    {
+      MOZ_LOG(POP3LOGMODULE, LogLevel::Warning,
+              (POP3LOG("POP: ask user what to do (after password failed): new password, retry or cancel")));
+
+      int32_t buttonPressed = 0;
+      if (NS_SUCCEEDED(MsgPromptLoginFailed(msgWindow, hostName,
+                                            &buttonPressed)))
+      {
+        if (buttonPressed == 1) // Cancel button
+        {
+          MOZ_LOG(POP3LOGMODULE, LogLevel::Warning, (POP3LOG("cancel button pressed")));
+          // Abort quickly and stop trying for now.
+
+          // If we haven't actually connected yet (i.e. we're doing an early
+          // attempt to get the username/password but we've previously failed
+          // for some reason), then skip straight to POP3_FREE as it isn't an
+          // error in this connection, and just ends up with us closing the
+          // socket and saying we've aborted the bind. Otherwise, pretend this
+          // is an error and move on.
+          m_pop3ConData->next_state =
+            m_pop3ConData->next_state == POP3_OBTAIN_PASSWORD_EARLY ?
+                                         POP3_FREE : POP3_ERROR_DONE;
+
+          // Clear the password we're going to return to force failure in
+          // the get mail instance.
+          passwordResult.Truncate();
+
+          // We also have to clear the password failed flag, otherwise we'll
+          // automatically try again.
+          ClearFlag(POP3_PASSWORD_FAILED);
+
+          // As we're async, calling ProcessProtocolState gets things going
+          // again.
+          ProcessProtocolState(nullptr, nullptr, 0, 0);
+          return NS_OK;
+        }
+        else if (buttonPressed == 2) // "New password" button
+        {
+          MOZ_LOG(POP3LOGMODULE, LogLevel::Warning, (POP3LOG("new password button pressed")));
+          // Forget the stored password
+          // and we'll prompt for a new one next time around.
+          rv = server->ForgetPassword();
+          NS_ENSURE_SUCCESS(rv, rv);
+
+          // try all methods again with new password
+          ResetAuthMethods();
+          // ... apart from GSSAPI, which doesn't care about passwords
+          MarkAuthMethodAsFailed(POP3_HAS_AUTH_GSSAPI);
+          if (m_needToRerunUrl)
+            return RerunUrl();
+        }
+        else if (buttonPressed == 0) // "Retry" button
+        {
+          MOZ_LOG(POP3LOGMODULE, LogLevel::Warning, (POP3LOG("retry button pressed")));
+          // try all methods again, including GSSAPI
+          ResetAuthMethods();
+          ClearFlag(POP3_PASSWORD_FAILED|POP3_AUTH_FAILURE);
+
+          if (m_needToRerunUrl)
+            return RerunUrl();
+
+          // It is a bit strange that we're going onto the next state that 
+          // would essentially send the password. However in resetting the
+          // auth methods above, we're setting up SendUsername, SendPassword
+          // and friends to abort and return to the POP3_SEND_CAPA state.
+          // Hence we can do this safely.
+          m_pop3ConData->next_state = GetNextPasswordObtainState();
+          // As we're async, calling ProcessProtocolState gets things going
+          // again.
+          ProcessProtocolState(nullptr, nullptr, 0, 0);
+          return NS_OK;
+        }
+      }
+    }
+    mLocalBundle->FormatStringFromName(
+      u"pop3PreviouslyEnteredPasswordIsInvalidPrompt",
+      passwordParams, 2, getter_Copies(passwordPrompt));
+  }
+  else
+    // Otherwise this is the first time we've asked about the server's
+    // password so show a first time prompt.
+    mLocalBundle->FormatStringFromName(
+      u"pop3EnterPasswordPrompt",
+      passwordParams, 2, getter_Copies(passwordPrompt));
+
+  nsString passwordTitle;
+  mLocalBundle->GetStringFromName(
+    u"pop3EnterPasswordPromptTitle",
+    getter_Copies(passwordTitle));
+
+  // Now go and get the password.
+  if (!passwordPrompt.IsEmpty() && !passwordTitle.IsEmpty())
+    rv = server->GetPasswordWithUI(passwordPrompt, passwordTitle,
+                                    msgWindow, passwordResult);
+  ClearFlag(POP3_PASSWORD_FAILED|POP3_AUTH_FAILURE);
+
+  // If it failed or the user cancelled the prompt, just abort the
+  // connection.
+  if (NS_FAILED(rv) ||
+      rv == NS_MSG_PASSWORD_PROMPT_CANCELLED)
+  {
+    m_pop3ConData->next_state = POP3_ERROR_DONE;
+    m_passwordResult.Truncate();
+    *aResult = false;
+  }
+  else
+  {
+    m_passwordResult = passwordResult;
+    m_pop3ConData->next_state = GetNextPasswordObtainState();
+    *aResult = true;
+  }
+  // Because this was done asynchronously, now call back into
+  // ProcessProtocolState to get the protocol going again.
+  ProcessProtocolState(nullptr, nullptr, 0, 0);
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsPop3Protocol::OnPromptAuthAvailable()
+{
+  NS_NOTREACHED("Did not expect to get POP3 protocol queuing up auth "
+                "connections for same server");
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsPop3Protocol::OnPromptCanceled()
+{
+  // A prompt was cancelled, so just abort out the connection
+  m_pop3ConData->next_state = POP3_ERROR_DONE;
+  // As we're async, calling ProcessProtocolState gets things going again.
+  ProcessProtocolState(nullptr, nullptr, 0, 0);
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsPop3Protocol::OnTransportStatus(nsITransport *aTransport, nsresult aStatus, int64_t aProgress, int64_t aProgressMax)
+{
+  return nsMsgProtocol::OnTransportStatus(aTransport, aStatus, aProgress, aProgressMax);
+}
+
+// stop binding is a "notification" informing us that the stream associated with aURL is going away.
+NS_IMETHODIMP nsPop3Protocol::OnStopRequest(nsIRequest *aRequest, nsISupports * aContext, nsresult aStatus)
+{
+  // If the server dropped the connection, m_socketIsOpen will be true, before
+  // we call nsMsgProtocol::OnStopRequest. The call will force a close socket,
+  // but we still want to go through the state machine one more time to cleanup
+  // the protocol object.
+  if (m_socketIsOpen)
+  {
+    nsCOMPtr<nsIMsgMailNewsUrl> msgUrl = do_QueryInterface(m_url);
+
+    // Check if the connection was dropped before getting back an auth error.
+    // If we got the auth error, the next state would be
+    // POP3_OBTAIN_PASSWORD_EARLY.
+    if ((m_pop3ConData->next_state_after_response == POP3_NEXT_AUTH_STEP ||
+         m_pop3ConData->next_state_after_response == POP3_AUTH_LOGIN_RESPONSE) &&
+        m_pop3ConData->next_state != POP3_OBTAIN_PASSWORD_EARLY)
+    {
+      MOZ_LOG(POP3LOGMODULE, LogLevel::Debug, (POP3LOG("dropped connection before auth error")));
+      SetFlag(POP3_AUTH_FAILURE);
+      m_pop3ConData->command_succeeded = false;
+      m_needToRerunUrl = true;
+      m_pop3ConData->next_state = POP3_NEXT_AUTH_STEP;
+      ProcessProtocolState(nullptr, nullptr, 0, 0);
+    }
+    // We can't call nsMsgProtocol::OnStopRequest because it calls SetUrlState,
+    // which notifies the URLListeners, but we need to do a bit of cleanup
+    // before running the url again.
+    CloseSocket();
+    if (m_loadGroup)
+      m_loadGroup->RemoveRequest(static_cast<nsIRequest *>(this), nullptr, aStatus);
+    m_pop3ConData->next_state = POP3_ERROR_DONE;
+    ProcessProtocolState(nullptr, nullptr, 0, 0);
+
+    if (NS_FAILED(aStatus) && aStatus != NS_BINDING_ABORTED)
+      nsMsgProtocol::ShowAlertMessage(msgUrl, aStatus);
+
+    return NS_OK;
+  }
+  nsresult rv = nsMsgProtocol::OnStopRequest(aRequest, aContext, aStatus);
+
+  // turn off the server busy flag on stop request - we know we're done, right?
+  nsCOMPtr<nsIMsgIncomingServer> server = do_QueryInterface(m_pop3Server);
+  if (server)
+  {
+    MOZ_LOG(POP3LOGMODULE, LogLevel::Debug,
+            (POP3LOG("Clearing server busy in nsPop3Protocol::OnStopRequest")));
+    server->SetServerBusy(false); // the server is not busy
+  }
+  if(m_pop3ConData->list_done)
+    CommitState(true);
+  if (NS_FAILED(aStatus) && aStatus != NS_BINDING_ABORTED)
+    Abort();
+  return rv;
+}
+
+void nsPop3Protocol::Abort()
+{
+  MOZ_LOG(POP3LOGMODULE, LogLevel::Debug, (POP3LOG("Abort")));
+
+  if(m_pop3ConData->msg_closure)
+  {
+      m_nsIPop3Sink->IncorporateAbort(m_pop3ConData->only_uidl != nullptr);
+      m_pop3ConData->msg_closure = nullptr;
+  }
+  // need this to close the stream on the inbox.
+  m_nsIPop3Sink->AbortMailDelivery(this);
+  MOZ_LOG(POP3LOGMODULE, LogLevel::Debug,
+          (POP3LOG("Clearing running protocol in nsPop3Protocol::Abort()")));
+  m_pop3Server->SetRunningProtocol(nullptr);
+}
+
+NS_IMETHODIMP nsPop3Protocol::Cancel(nsresult status)  // handle stop button
+{
+  Abort();
+  return nsMsgProtocol::Cancel(NS_BINDING_ABORTED);
+}
+
+
+nsresult nsPop3Protocol::LoadUrl(nsIURI* aURL, nsISupports * /* aConsumer */)
+{
+  MOZ_LOG(POP3LOGMODULE, LogLevel::Debug, (POP3LOG("LoadUrl()")));
+
+  nsresult rv = Initialize(aURL);
+  NS_ENSURE_SUCCESS(rv, rv);
+  if (aURL)
+    m_url = do_QueryInterface(aURL);
+  else
+    return NS_ERROR_FAILURE;
+
+  nsCOMPtr<nsIURL> url = do_QueryInterface(aURL, &rv);
+  if (NS_FAILED(rv)) return rv;
+
+  int32_t port;
+  rv = url->GetPort(&port);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = NS_CheckPortSafety(port, "pop");
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsAutoCString queryPart;
+  rv = url->GetQuery(queryPart);
+  NS_ASSERTION(NS_SUCCEEDED(rv), "unable to get the url spect");
+
+  m_pop3ConData->only_check_for_new_mail = (PL_strcasestr(queryPart.get(), "check") != nullptr);
+  m_pop3ConData->verify_logon = (PL_strcasestr(queryPart.get(), "verifyLogon") != nullptr);
+  m_pop3ConData->get_url = (PL_strcasestr(queryPart.get(), "gurl") != nullptr);
+
+  bool deleteByAgeFromServer = false;
+  int32_t numDaysToLeaveOnServer = -1;
+  if (!m_pop3ConData->verify_logon)
+  {
+    // Pick up pref setting regarding leave messages on server, message size limit
+
+    m_pop3Server->GetLeaveMessagesOnServer(&m_pop3ConData->leave_on_server);
+    m_pop3Server->GetHeadersOnly(&m_pop3ConData->headers_only);
+    bool limitMessageSize = false;
+
+    nsCOMPtr<nsIMsgIncomingServer> server = do_QueryInterface(m_pop3Server);
+    if (server)
+    {
+      // size limits are superseded by headers_only mode
+      if (!m_pop3ConData->headers_only)
+      {
+        server->GetLimitOfflineMessageSize(&limitMessageSize);
+        if (limitMessageSize)
+        {
+          int32_t max_size = 0; // default size
+          server->GetMaxMessageSize(&max_size);
+          m_pop3ConData->size_limit = (max_size) ? max_size * 1024 : 50 * 1024;
+       }
+      }
+      m_pop3Server->GetDeleteByAgeFromServer(&deleteByAgeFromServer);
+      if (deleteByAgeFromServer)
+        m_pop3Server->GetNumDaysToLeaveOnServer(&numDaysToLeaveOnServer);
+    }
+  }
+
+  // UIDL stuff
+  nsCOMPtr<nsIPop3URL> pop3Url = do_QueryInterface(m_url);
+  if (pop3Url)
+    pop3Url->GetPop3Sink(getter_AddRefs(m_nsIPop3Sink));
+
+  nsCOMPtr<nsIFile> mailDirectory;
+
+  nsCString hostName;
+  nsCString userName;
+
+  nsCOMPtr<nsIMsgIncomingServer> server = do_QueryInterface(m_pop3Server);
+  if (server)
+  {
+    rv = server->GetLocalPath(getter_AddRefs(mailDirectory));
+    NS_ENSURE_SUCCESS(rv, rv);
+    server->SetServerBusy(true); // the server is now busy
+    server->GetHostName(hostName);
+    server->GetUsername(userName);
+    MOZ_LOG(POP3LOGMODULE, LogLevel::Info,
+            (POP3LOG("Connecting to server %s:%d"), hostName.get(), port));
+
+    MOZ_LOG(POP3LOGMODULE, LogLevel::Debug,
+            (POP3LOG("Setting server busy in nsPop3Protocol::LoadUrl()")));
+  }
+
+  if (!m_pop3ConData->verify_logon)
+    m_pop3ConData->uidlinfo = net_pop3_load_state(hostName.get(), userName.get(), mailDirectory);
+
+  m_pop3ConData->biffstate = nsIMsgFolder::nsMsgBiffState_NoMail;
+
+  if (m_pop3ConData->uidlinfo && numDaysToLeaveOnServer > 0)
+  {
+    uint32_t nowInSeconds = TimeInSecondsFromPRTime(PR_Now());
+    uint32_t cutOffDay = nowInSeconds - (60 * 60 * 24 * numDaysToLeaveOnServer);
+
+    PL_HashTableEnumerateEntries(m_pop3ConData->uidlinfo->hash, net_pop3_delete_old_msgs_mapper, (void *)(uintptr_t) cutOffDay);
+  }
+  const char* uidl = PL_strcasestr(queryPart.get(), "uidl=");
+  PR_FREEIF(m_pop3ConData->only_uidl);
+
+  if (uidl)
+  {
+    uidl += 5;
+    nsCString unescapedData;
+    MsgUnescapeString(nsDependentCString(uidl), 0, unescapedData);
+    m_pop3ConData->only_uidl = PL_strdup(unescapedData.get());
+
+    mSuppressListenerNotifications = true; // suppress on start and on stop because this url won't have any content to display
+  }
+
+  m_pop3ConData->next_state = POP3_START_CONNECT;
+  m_pop3ConData->next_state_after_response = POP3_FINISH_CONNECT;
+  if (NS_SUCCEEDED(rv))
+  {
+    m_pop3Server->SetRunningProtocol(this);
+    return nsMsgProtocol::LoadUrl(aURL);
+  }
+  else
+    return rv;
+}
+
+void
+nsPop3Protocol::FreeMsgInfo()
+{
+  int i;
+  if (m_pop3ConData->msg_info)
+  {
+    for (i=0 ; i<m_pop3ConData->number_of_messages ; i++)
+    {
+      if (m_pop3ConData->msg_info[i].uidl)
+        PR_Free(m_pop3ConData->msg_info[i].uidl);
+      m_pop3ConData->msg_info[i].uidl = nullptr;
+    }
+    PR_Free(m_pop3ConData->msg_info);
+    m_pop3ConData->msg_info = nullptr;
+  }
+}
+
+int32_t
+nsPop3Protocol::WaitForStartOfConnectionResponse(nsIInputStream* aInputStream,
+                                                 uint32_t length)
+{
+  char * line = nullptr;
+  uint32_t line_length = 0;
+  bool pauseForMoreData = false;
+  nsresult rv;
+  line = m_lineStreamBuffer->ReadNextLine(aInputStream, line_length, pauseForMoreData, &rv);
+
+  MOZ_LOG(POP3LOGMODULE, LogLevel::Info, (POP3LOG("RECV: %s"), line));
+  if (NS_FAILED(rv))
+    return -1;
+
+  if(pauseForMoreData || !line)
+  {
+    m_pop3ConData->pause_for_read = true; /* pause */
+    PR_Free(line);
+    return(line_length);
+  }
+
+  if(*line == '+')
+  {
+    m_pop3ConData->command_succeeded = true;
+    if(PL_strlen(line) > 4)
+      m_commandResponse = line + 4;
+    else
+      m_commandResponse = line;
+
+    if (m_prefAuthMethods & POP3_HAS_AUTH_APOP)
+    {
+      if (NS_SUCCEEDED(GetApopTimestamp()))
+        SetCapFlag(POP3_HAS_AUTH_APOP);
+    }
+    else
+      ClearCapFlag(POP3_HAS_AUTH_APOP);
+
+    m_pop3Server->SetPop3CapabilityFlags(m_pop3ConData->capability_flags);
+
+    m_pop3ConData->next_state = POP3_PROCESS_AUTH;
+    m_pop3ConData->pause_for_read = false; /* don't pause */
+  }
+
+  PR_Free(line);
+  return(1);  /* everything ok */
+}
+
+int32_t
+nsPop3Protocol::WaitForResponse(nsIInputStream* inputStream, uint32_t length)
+{
+  char * line;
+  uint32_t ln = 0;
+  bool pauseForMoreData = false;
+  nsresult rv;
+  line = m_lineStreamBuffer->ReadNextLine(inputStream, ln, pauseForMoreData, &rv);
+  if (NS_FAILED(rv))
+    return -1;
+
+  if(pauseForMoreData || !line)
+  {
+    m_pop3ConData->pause_for_read = true; /* pause */
+
+    PR_Free(line);
+    return(ln);
+  }
+
+  MOZ_LOG(POP3LOGMODULE, LogLevel::Info, (POP3LOG("RECV: %s"), line));
+
+  if(*line == '+')
+  {
+    m_pop3ConData->command_succeeded = true;
+    if(PL_strlen(line) > 4)
+    {
+      if(!PL_strncasecmp(line, "+OK", 3))
+        m_commandResponse = line + 4;
+      else  // challenge answer to AUTH CRAM-MD5 and LOGIN username/password
+        m_commandResponse = line + 2;
+    }
+    else
+      m_commandResponse = line;
+  }
+  else
+  {
+    m_pop3ConData->command_succeeded = false;
+    if(PL_strlen(line) > 5)
+      m_commandResponse = line + 5;
+    else
+      m_commandResponse  = line;
+
+    // search for the response codes (RFC 2449, chapter 8 and RFC 3206)
+    if(TestCapFlag(POP3_HAS_RESP_CODES | POP3_HAS_AUTH_RESP_CODE))
+    {
+        // code for authentication failure due to the user's credentials
+        if(m_commandResponse.Find("[AUTH", true) >= 0)
+        {
+          MOZ_LOG(POP3LOGMODULE, LogLevel::Debug, (POP3LOG("setting auth failure")));
+          SetFlag(POP3_AUTH_FAILURE);
+        }
+
+        // codes for failures due to other reasons
+        if(m_commandResponse.Find("[LOGIN-DELAY", true) >= 0 ||
+           m_commandResponse.Find("[IN-USE", true) >= 0 ||
+           m_commandResponse.Find("[SYS", true) >= 0)
+      SetFlag(POP3_STOPLOGIN);
+
+      // remove the codes from the response string presented to the user
+      int32_t i = m_commandResponse.FindChar(']');
+      if(i >= 0)
+        m_commandResponse.Cut(0, i + 2);
+    }
+  }
+
+  m_pop3ConData->next_state = m_pop3ConData->next_state_after_response;
+  m_pop3ConData->pause_for_read = false; /* don't pause */
+
+  PR_Free(line);
+  return(1);  /* everything ok */
+}
+
+int32_t
+nsPop3Protocol::Error(const char* err_code,
+                      const char16_t **params,
+                      uint32_t length)
+{
+    MOZ_LOG(POP3LOGMODULE, LogLevel::Info, (POP3LOG("ERROR: %s"), err_code));
+
+    // the error code is just the resource name for the error string...
+    // so print out that error message!
+    nsCOMPtr<nsIMsgIncomingServer> server = do_QueryInterface(m_pop3Server);
+    nsString accountName;
+    nsresult rv = server->GetPrettyName(accountName);
+    NS_ENSURE_SUCCESS(rv, -1);
+    const char16_t *titleParams[] = { accountName.get() };
+    nsString dialogTitle;
+    mLocalBundle->FormatStringFromName(
+      u"pop3ErrorDialogTitle",
+      titleParams, 1, getter_Copies(dialogTitle));
+    nsCOMPtr<nsIMsgMailNewsUrl> mailnewsUrl = do_QueryInterface(m_url, &rv);
+    // we handle "pop3TmpDownloadError" earlier...
+    if (strcmp(err_code, "pop3TmpDownloadError") && NS_SUCCEEDED(rv))
+    {
+        nsCOMPtr<nsIMsgWindow> msgWindow;
+        nsCOMPtr<nsIPrompt> dialog;
+        rv = mailnewsUrl->GetMsgWindow(getter_AddRefs(msgWindow)); //it is ok to have null msgWindow, for example when biffing
+        if (NS_SUCCEEDED(rv) && msgWindow)
+        {
+            rv = msgWindow->GetPromptDialog(getter_AddRefs(dialog));
+            if (NS_SUCCEEDED(rv))
+            {
+              nsString alertString;
+              // Format the alert string if parameter list isn't empty
+              if (params)
+                mLocalBundle->FormatStringFromName(NS_ConvertASCIItoUTF16(err_code).get(),
+                                                   params, length, getter_Copies(alertString));
+              else
+                mLocalBundle->GetStringFromName(NS_ConvertASCIItoUTF16(err_code).get(),
+                                                getter_Copies(alertString));
+              if (m_pop3ConData->command_succeeded)  //not a server error message
+                dialog->Alert(dialogTitle.get(), alertString.get());
+              else
+              {
+                nsString serverSaidPrefix;
+                nsCOMPtr<nsIMsgIncomingServer> server = do_QueryInterface(m_pop3Server);
+                nsCString hostName;
+                // Fomat string with hostname.
+                if (server)
+                  rv = server->GetRealHostName(hostName);
+                if (NS_SUCCEEDED(rv))
+                {
+                  nsAutoString hostStr;
+                  CopyASCIItoUTF16(hostName, hostStr);
+                  const char16_t *params[] = { hostStr.get() };
+                  mLocalBundle->FormatStringFromName(
+                    u"pop3ServerSaid",
+                    params, 1, getter_Copies(serverSaidPrefix));
+                }
+
+                nsAutoString message(alertString);
+                message.AppendLiteral(" ");
+                message.Append(serverSaidPrefix);
+                message.AppendLiteral(" ");
+                message.Append(NS_ConvertASCIItoUTF16(m_commandResponse));
+                dialog->Alert(dialogTitle.get(), message.get());
+              }
+            }
+        }
+    }
+    m_pop3ConData->next_state = POP3_ERROR_DONE;
+    m_pop3ConData->pause_for_read = false;
+    return -1;
+}
+
+int32_t nsPop3Protocol::Pop3SendData(const char * dataBuffer, bool aSuppressLogging)
+{
+  // remove any leftover bytes in the line buffer
+  // this can happen if the last message line doesn't end with a (CR)LF
+  // or a server sent two reply lines
+  m_lineStreamBuffer->ClearBuffer();
+
+  nsresult result = nsMsgProtocol::SendData(dataBuffer);
+
+  if (!aSuppressLogging)
+      MOZ_LOG(POP3LOGMODULE, LogLevel::Info, (POP3LOG("SEND: %s"), dataBuffer));
+  else
+      MOZ_LOG(POP3LOGMODULE, LogLevel::Info,
+              (POP3LOG("Logging suppressed for this command (it probably contained authentication information)")));
+
+  if (NS_SUCCEEDED(result))
+  {
+    m_pop3ConData->pause_for_read = true;
+    m_pop3ConData->next_state = POP3_WAIT_FOR_RESPONSE;
+    return 0;
+  }
+
+  m_pop3ConData->next_state = POP3_ERROR_DONE;
+  MOZ_LOG(POP3LOGMODULE, LogLevel::Info, (POP3LOG("Pop3SendData failed: %lx"), result));
+  return -1;
+}
+
+/*
+ * POP3 AUTH extension
+ */
+
+int32_t nsPop3Protocol::SendAuth()
+{
+  MOZ_LOG(POP3LOGMODULE, LogLevel::Debug, (POP3LOG("SendAuth()")));
+
+  if(!m_pop3ConData->command_succeeded)
+    return Error("pop3ServerError");
+
+  nsAutoCString command("AUTH" CRLF);
+
+  m_pop3ConData->next_state_after_response = POP3_AUTH_RESPONSE;
+  return Pop3SendData(command.get());
+}
+
+int32_t nsPop3Protocol::AuthResponse(nsIInputStream* inputStream,
+                             uint32_t length)
+{
+    char * line;
+    uint32_t ln = 0;
+    nsresult rv;
+
+    if (TestCapFlag(POP3_AUTH_MECH_UNDEFINED))
+    {
+        ClearCapFlag(POP3_AUTH_MECH_UNDEFINED);
+        m_pop3Server->SetPop3CapabilityFlags(m_pop3ConData->capability_flags);
+    }
+
+    if (!m_pop3ConData->command_succeeded)
+    {
+        /* AUTH command not implemented
+         * so no secure mechanisms available
+         */
+        m_pop3ConData->command_succeeded = true;
+        m_pop3Server->SetPop3CapabilityFlags(m_pop3ConData->capability_flags);
+        m_pop3ConData->next_state = POP3_SEND_CAPA;
+        return 0;
+    }
+
+    bool pauseForMoreData = false;
+    line = m_lineStreamBuffer->ReadNextLine(inputStream, ln, pauseForMoreData, &rv);
+    if (NS_FAILED(rv))
+      return -1;
+
+    if(pauseForMoreData || !line)
+    {
+        m_pop3ConData->pause_for_read = true; /* pause */
+        PR_Free(line);
+        return(0);
+    }
+
+    MOZ_LOG(POP3LOGMODULE, LogLevel::Info, (POP3LOG("RECV: %s"), line));
+
+    if (!PL_strcmp(line, "."))
+    {
+        m_pop3Server->SetPop3CapabilityFlags(m_pop3ConData->capability_flags);
+
+        // now that we've read all the AUTH responses, go for it
+        m_pop3ConData->next_state = POP3_SEND_CAPA;
+        m_pop3ConData->pause_for_read = false; /* don't pause */
+    }
+    else if (!PL_strcasecmp (line, "CRAM-MD5"))
+      SetCapFlag(POP3_HAS_AUTH_CRAM_MD5);
+    else if (!PL_strcasecmp (line, "NTLM"))
+      SetCapFlag(POP3_HAS_AUTH_NTLM);
+    else if (!PL_strcasecmp (line, "MSN"))
+      SetCapFlag(POP3_HAS_AUTH_NTLM|POP3_HAS_AUTH_MSN);
+    else if (!PL_strcasecmp (line, "GSSAPI"))
+        SetCapFlag(POP3_HAS_AUTH_GSSAPI);
+    else if (!PL_strcasecmp (line, "PLAIN"))
+        SetCapFlag(POP3_HAS_AUTH_PLAIN);
+    else if (!PL_strcasecmp (line, "LOGIN"))
+        SetCapFlag(POP3_HAS_AUTH_LOGIN);
+
+    PR_Free(line);
+    return 0;
+}
+
+/*
+ * POP3 CAPA extension, see RFC 2449, chapter 5
+ */
+
+int32_t nsPop3Protocol::SendCapa()
+{
+    MOZ_LOG(POP3LOGMODULE, LogLevel::Debug, (POP3LOG("SendCapa()")));
+    if(!m_pop3ConData->command_succeeded)
+        return Error("pop3ServerError");
+
+    nsAutoCString command("CAPA" CRLF);
+
+    m_pop3ConData->next_state_after_response = POP3_CAPA_RESPONSE;
+    return Pop3SendData(command.get());
+}
+
+int32_t nsPop3Protocol::CapaResponse(nsIInputStream* inputStream,
+                             uint32_t length)
+{
+    char * line;
+    uint32_t ln = 0;
+
+    if (!m_pop3ConData->command_succeeded)
+    {
+        /* CAPA command not implemented */
+        m_pop3ConData->command_succeeded = true;
+        m_pop3Server->SetPop3CapabilityFlags(m_pop3ConData->capability_flags);
+        m_pop3ConData->next_state = POP3_PROCESS_AUTH;
+        return 0;
+    }
+
+    bool pauseForMoreData = false;
+    nsresult rv;
+    line = m_lineStreamBuffer->ReadNextLine(inputStream, ln, pauseForMoreData, &rv);
+    if (NS_FAILED(rv))
+      return -1;
+
+    if(pauseForMoreData || !line)
+    {
+        m_pop3ConData->pause_for_read = true; /* pause */
+        PR_Free(line);
+        return(0);
+    }
+
+    MOZ_LOG(POP3LOGMODULE, LogLevel::Info, (POP3LOG("RECV: %s"), line));
+
+    if (!PL_strcmp(line, "."))
+    {
+        // now that we've read all the CAPA responses, go for it
+        m_pop3ConData->next_state = POP3_PROCESS_AUTH;
+        m_pop3ConData->pause_for_read = false; /* don't pause */
+    }
+    else
+    if (!PL_strcasecmp(line, "XSENDER"))
+    {
+        SetCapFlag(POP3_HAS_XSENDER);
+        m_pop3Server->SetPop3CapabilityFlags(m_pop3ConData->capability_flags);
+    }
+    else
+    // see RFC 2449, chapter 6.4
+    if (!PL_strcasecmp(line, "RESP-CODES"))
+    {
+        SetCapFlag(POP3_HAS_RESP_CODES);
+        m_pop3Server->SetPop3CapabilityFlags(m_pop3ConData->capability_flags);
+    }
+    else
+    // see RFC 3206, chapter 6
+    if (!PL_strcasecmp(line, "AUTH-RESP-CODE"))
+    {
+        SetCapFlag(POP3_HAS_AUTH_RESP_CODE);
+        m_pop3Server->SetPop3CapabilityFlags(m_pop3ConData->capability_flags);
+    }
+    else
+    // see RFC 2595, chapter 4
+    if (!PL_strcasecmp(line, "STLS"))
+    {
+      SetCapFlag(POP3_HAS_STLS);
+      m_pop3Server->SetPop3CapabilityFlags(m_pop3ConData->capability_flags);
+    }
+    else
+    // see RFC 2449, chapter 6.3
+    if (!PL_strncasecmp(line, "SASL", 4) && strlen(line) > 6)
+    {
+        nsAutoCString responseLine;
+        responseLine.Assign(line + 5);
+
+        if (responseLine.Find("PLAIN", CaseInsensitiveCompare) >= 0)
+            SetCapFlag(POP3_HAS_AUTH_PLAIN);
+
+        if (responseLine.Find("LOGIN", CaseInsensitiveCompare) >= 0)
+            SetCapFlag(POP3_HAS_AUTH_LOGIN);
+
+        if (responseLine.Find("GSSAPI", CaseInsensitiveCompare) >= 0)
+            SetCapFlag(POP3_HAS_AUTH_GSSAPI);
+
+        if (responseLine.Find("CRAM-MD5", CaseInsensitiveCompare) >= 0)
+          SetCapFlag(POP3_HAS_AUTH_CRAM_MD5);
+
+        if (responseLine.Find("NTLM", CaseInsensitiveCompare) >= 0)
+          SetCapFlag(POP3_HAS_AUTH_NTLM);
+
+        if (responseLine.Find("MSN", CaseInsensitiveCompare) >= 0)
+          SetCapFlag(POP3_HAS_AUTH_NTLM|POP3_HAS_AUTH_MSN);
+
+        m_pop3Server->SetPop3CapabilityFlags(m_pop3ConData->capability_flags);
+    }
+
+    PR_Free(line);
+    MOZ_LOG(POP3LOGMODULE, LogLevel::Debug, (POP3LOG("Capability entry processed")));
+    return 0;
+}
+
+int32_t nsPop3Protocol::SendTLSResponse()
+{
+  // only tear down our existing connection and open a new one if we received
+  // a +OK response from the pop server after we issued the STLS command
+  nsresult rv = NS_OK;
+  if (m_pop3ConData->command_succeeded)
+  {
+      nsCOMPtr<nsISupports> secInfo;
+      nsCOMPtr<nsISocketTransport> strans = do_QueryInterface(m_transport, &rv);
+      if (NS_FAILED(rv))
+        return -1;
+
+      rv = strans->GetSecurityInfo(getter_AddRefs(secInfo));
+
+      if (NS_SUCCEEDED(rv) && secInfo)
+      {
+          nsCOMPtr<nsISSLSocketControl> sslControl = do_QueryInterface(secInfo, &rv);
+
+          if (NS_SUCCEEDED(rv) && sslControl)
+              rv = sslControl->StartTLS();
+      }
+
+    if (NS_SUCCEEDED(rv))
+    {
+      m_pop3ConData->next_state = POP3_SEND_AUTH;
+      m_tlsEnabled = true;
+
+      // certain capabilities like POP3_HAS_AUTH_APOP should be
+      // preserved across the connections.
+      uint32_t preservedCapFlags = m_pop3ConData->capability_flags & POP3_HAS_AUTH_APOP;
+      m_pop3ConData->capability_flags =     // resetting the flags
+        POP3_AUTH_MECH_UNDEFINED |
+        POP3_HAS_AUTH_USER |                // should be always there
+        POP3_GURL_UNDEFINED |
+        POP3_UIDL_UNDEFINED |
+        POP3_TOP_UNDEFINED |
+        POP3_XTND_XLST_UNDEFINED |
+        preservedCapFlags;
+      m_pop3Server->SetPop3CapabilityFlags(m_pop3ConData->capability_flags);
+      return 0;
+    }
+  }
+
+  ClearFlag(POP3_HAS_STLS);
+  m_pop3ConData->next_state = POP3_PROCESS_AUTH;
+
+  return (NS_SUCCEEDED(rv) ? 0 : -1);
+}
+
+void nsPop3Protocol::InitPrefAuthMethods(int32_t authMethodPrefValue)
+{
+  // for m_prefAuthMethods, using the same flags as server capablities.
+  switch (authMethodPrefValue)
+  {
+    case nsMsgAuthMethod::none:
+      m_prefAuthMethods = POP3_HAS_AUTH_NONE;
+      break;
+    case nsMsgAuthMethod::old:
+      m_prefAuthMethods = POP3_HAS_AUTH_USER;
+      break;
+    case nsMsgAuthMethod::passwordCleartext:
+      m_prefAuthMethods = POP3_HAS_AUTH_USER |
+          POP3_HAS_AUTH_LOGIN | POP3_HAS_AUTH_PLAIN;
+      break;
+    case nsMsgAuthMethod::passwordEncrypted:
+      m_prefAuthMethods = POP3_HAS_AUTH_CRAM_MD5 |
+          POP3_HAS_AUTH_APOP;
+      break;
+    case nsMsgAuthMethod::NTLM:
+      m_prefAuthMethods = POP3_HAS_AUTH_NTLM | POP3_HAS_AUTH_MSN;
+      break;
+    case nsMsgAuthMethod::GSSAPI:
+      m_prefAuthMethods = POP3_HAS_AUTH_GSSAPI;
+      break;
+    case nsMsgAuthMethod::secure:
+      m_prefAuthMethods = POP3_HAS_AUTH_APOP |
+          POP3_HAS_AUTH_CRAM_MD5 | POP3_HAS_AUTH_GSSAPI |
+          POP3_HAS_AUTH_NTLM | POP3_HAS_AUTH_MSN;
+      break;
+    default:
+      NS_ASSERTION(false, "POP: authMethod pref invalid");
+      // TODO log to error console
+      MOZ_LOG(POP3LOGMODULE, LogLevel::Error,
+              (POP3LOG("POP: bad pref authMethod = %d\n"), authMethodPrefValue));
+      // fall to any
+      MOZ_FALLTHROUGH;
+    case nsMsgAuthMethod::anything:
+      m_prefAuthMethods = POP3_HAS_AUTH_USER |
+          POP3_HAS_AUTH_LOGIN | POP3_HAS_AUTH_PLAIN |
+          POP3_HAS_AUTH_CRAM_MD5 | POP3_HAS_AUTH_APOP |
+          POP3_HAS_AUTH_GSSAPI |
+          POP3_HAS_AUTH_NTLM | POP3_HAS_AUTH_MSN;
+      // TODO needed?
+      break;
+  }
+  NS_ASSERTION(m_prefAuthMethods != POP3_AUTH_MECH_UNDEFINED,
+      "POP: InitPrefAuthMethods() didn't work");
+}
+
+/**
+ * Changes m_currentAuthMethod to pick the best one
+ * which is allowed by server and prefs and not marked failed.
+ * The order of preference and trying of auth methods is encoded here.
+ */
+nsresult nsPop3Protocol::ChooseAuthMethod()
+{
+  int32_t availCaps = GetCapFlags() & m_prefAuthMethods & ~m_failedAuthMethods;
+
+  MOZ_LOG(POP3LOGMODULE, LogLevel::Debug,
+          (POP3LOG("POP auth: server caps 0x%X, pref 0x%X, failed 0x%X, avail caps 0x%X"),
+           GetCapFlags(), m_prefAuthMethods, m_failedAuthMethods, availCaps));
+  MOZ_LOG(POP3LOGMODULE, LogLevel::Debug,
+          (POP3LOG("(GSSAPI = 0x%X, CRAM = 0x%X, APOP = 0x%X, NTLM = 0x%X, "
+           "MSN =  0x%X, PLAIN = 0x%X, LOGIN = 0x%X, USER/PASS = 0x%X)"),
+           POP3_HAS_AUTH_GSSAPI, POP3_HAS_AUTH_CRAM_MD5, POP3_HAS_AUTH_APOP,
+           POP3_HAS_AUTH_NTLM, POP3_HAS_AUTH_MSN, POP3_HAS_AUTH_PLAIN,
+           POP3_HAS_AUTH_LOGIN, POP3_HAS_AUTH_USER));
+
+  if (POP3_HAS_AUTH_GSSAPI & availCaps)
+    m_currentAuthMethod = POP3_HAS_AUTH_GSSAPI;
+  else if (POP3_HAS_AUTH_CRAM_MD5 & availCaps)
+    m_currentAuthMethod = POP3_HAS_AUTH_CRAM_MD5;
+  else if (POP3_HAS_AUTH_APOP & availCaps)
+    m_currentAuthMethod = POP3_HAS_AUTH_APOP;
+  else if (POP3_HAS_AUTH_NTLM & availCaps)
+    m_currentAuthMethod = POP3_HAS_AUTH_NTLM;
+  else if (POP3_HAS_AUTH_MSN & availCaps)
+    m_currentAuthMethod = POP3_HAS_AUTH_MSN;
+  else if (POP3_HAS_AUTH_PLAIN & availCaps)
+    m_currentAuthMethod = POP3_HAS_AUTH_PLAIN;
+  else if (POP3_HAS_AUTH_LOGIN & availCaps)
+    m_currentAuthMethod = POP3_HAS_AUTH_LOGIN;
+  else if (POP3_HAS_AUTH_USER & availCaps)
+    m_currentAuthMethod = POP3_HAS_AUTH_USER;
+  else
+  {
+    // there are no matching login schemes at all, per server and prefs
+    m_currentAuthMethod = POP3_AUTH_MECH_UNDEFINED;
+    MOZ_LOG(POP3LOGMODULE, LogLevel::Debug, (POP3LOG("no auth method remaining")));
+    return NS_ERROR_FAILURE;
+  }
+  MOZ_LOG(POP3LOGMODULE, LogLevel::Debug,
+          (POP3LOG("trying auth method 0x%X"), m_currentAuthMethod));
+  return NS_OK;
+}
+
+void nsPop3Protocol::MarkAuthMethodAsFailed(int32_t failedAuthMethod)
+{
+  MOZ_LOG(POP3LOGMODULE, LogLevel::Debug,
+          (POP3LOG("marking auth method 0x%X failed"), failedAuthMethod));
+  m_failedAuthMethods |= failedAuthMethod;
+}
+
+/**
+ * Start over, trying all auth methods again
+ */
+void nsPop3Protocol::ResetAuthMethods()
+{
+  MOZ_LOG(POP3LOGMODULE, LogLevel::Debug, (POP3LOG("resetting (failed) auth methods")));
+  m_currentAuthMethod = POP3_AUTH_MECH_UNDEFINED;
+  m_failedAuthMethods = 0;
+}
+
+/**
+ * state POP3_PROCESS_AUTH
+ * Called when we should try to authenticate to the server.
+ * Also called when one auth method fails and we want to try and start
+ * the next best auth method.
+ */
+int32_t nsPop3Protocol::ProcessAuth()
+{
+    MOZ_LOG(POP3LOGMODULE, LogLevel::Debug, (POP3LOG("ProcessAuth()")));
+
+    // Try to upgrade to STARTTLS -- TODO move into its own function
+    if (!m_tlsEnabled)
+    {
+      if(TestCapFlag(POP3_HAS_STLS))
+      {
+        if (m_socketType == nsMsgSocketType::trySTARTTLS ||
+            m_socketType == nsMsgSocketType::alwaysSTARTTLS)
+        {
+            nsAutoCString command("STLS" CRLF);
+
+            m_pop3ConData->next_state_after_response = POP3_TLS_RESPONSE;
+            return Pop3SendData(command.get());
+        }
+      }
+      else if (m_socketType == nsMsgSocketType::alwaysSTARTTLS)
+      {
+          m_pop3ConData->next_state = POP3_ERROR_DONE;
+          return Error("nsErrorCouldNotConnectViaTls");
+      }
+    }
+
+    m_password_already_sent = false;
+
+    nsresult rv = ChooseAuthMethod();
+    if (NS_FAILED(rv))
+    {
+      // Pref doesn't match server. Now, find an appropriate error msg.
+      MOZ_LOG(POP3LOGMODULE, LogLevel::Debug,
+              (POP3LOG("ProcessAuth() early exit because no auth methods")));
+
+      // AuthGSSAPI* falls in here in case of an auth failure.
+      // If Kerberos was the only method, assume that
+      // the user is just not logged in yet, and show an appropriate error.
+      if (m_prefAuthMethods == POP3_HAS_AUTH_GSSAPI &&
+          m_failedAuthMethods == POP3_HAS_AUTH_GSSAPI)
+        return Error("pop3GssapiFailure");
+
+      // pref has plaintext pw & server claims to support encrypted pw
+      if (m_prefAuthMethods == (POP3_HAS_AUTH_USER | POP3_HAS_AUTH_LOGIN |
+              POP3_HAS_AUTH_PLAIN) &&
+          GetCapFlags() & (POP3_HAS_AUTH_CRAM_MD5 | POP3_HAS_AUTH_APOP))
+        // tell user to change to encrypted pw
+        return Error("pop3AuthChangePlainToEncrypt");
+      // pref has encrypted pw & server claims to support plaintext pw
+      else if (m_prefAuthMethods == (POP3_HAS_AUTH_CRAM_MD5 |
+                    POP3_HAS_AUTH_APOP) &&
+               GetCapFlags() & (POP3_HAS_AUTH_USER | POP3_HAS_AUTH_LOGIN |
+                    POP3_HAS_AUTH_PLAIN))
+      {
+        // have SSL
+        if (m_socketType == nsMsgSocketType::SSL ||
+            m_socketType == nsMsgSocketType::alwaysSTARTTLS)
+          // tell user to change to plaintext pw
+          return Error("pop3AuthChangeEncryptToPlainSSL");
+        else
+          // tell user to change to plaintext pw, with big warning
+          return Error("pop3AuthChangeEncryptToPlainNoSSL");
+      }
+      else
+        // just "change auth method"
+        return Error("pop3AuthMechNotSupported");
+    }
+
+    switch (m_currentAuthMethod)
+    {
+      case POP3_HAS_AUTH_GSSAPI:
+        MOZ_LOG(POP3LOGMODULE, LogLevel::Debug, (POP3LOG("POP GSSAPI")));
+        m_pop3ConData->next_state = POP3_AUTH_GSSAPI;
+        break;
+      case POP3_HAS_AUTH_APOP:
+        MOZ_LOG(POP3LOGMODULE, LogLevel::Debug, (POP3LOG("POP APOP")));
+        m_pop3ConData->next_state = POP3_SEND_PASSWORD;
+        break;
+      case POP3_HAS_AUTH_CRAM_MD5:
+        MOZ_LOG(POP3LOGMODULE, LogLevel::Debug, (POP3LOG("POP CRAM")));
+        MOZ_FALLTHROUGH;
+      case POP3_HAS_AUTH_PLAIN:
+      case POP3_HAS_AUTH_USER:
+        MOZ_LOG(POP3LOGMODULE, LogLevel::Debug, (POP3LOG("POP username")));
+        m_pop3ConData->next_state = POP3_SEND_USERNAME;
+        break;
+      case POP3_HAS_AUTH_LOGIN:
+        MOZ_LOG(POP3LOGMODULE, LogLevel::Debug, (POP3LOG("POP AUTH=LOGIN")));
+        m_pop3ConData->next_state = POP3_AUTH_LOGIN;
+        break;
+      case POP3_HAS_AUTH_NTLM:
+        MOZ_LOG(POP3LOGMODULE, LogLevel::Debug, (POP3LOG("POP NTLM")));
+        m_pop3ConData->next_state = POP3_AUTH_NTLM;
+        break;
+      case POP3_HAS_AUTH_NONE:
+        MOZ_LOG(POP3LOGMODULE, LogLevel::Debug, (POP3LOG("POP no auth")));
+        m_pop3ConData->command_succeeded = true;
+        m_pop3ConData->next_state = POP3_NEXT_AUTH_STEP;
+        break;
+      default:
+        MOZ_LOG(POP3LOGMODULE, LogLevel::Error,
+                (POP3LOG("POP: m_currentAuthMethod has unknown value")));
+        return Error("pop3AuthMechNotSupported");
+    }
+
+    m_pop3ConData->pause_for_read = false;
+
+    return 0;
+}
+
+/**
+ * state POP3_NEXT_AUTH_STEP
+ * This is called when we finished one auth step (e.g. sending username
+ * or password are separate steps, similarly for AUTH LOGIN, NTLM etc.)
+ * and want to proceed to the next one.
+ */
+int32_t nsPop3Protocol::NextAuthStep()
+{
+    MOZ_LOG(POP3LOGMODULE, LogLevel::Debug, (POP3LOG("NextAuthStep()")));
+    if (m_pop3ConData->command_succeeded)
+    {
+        if (m_password_already_sent || // (also true for GSSAPI)
+            m_currentAuthMethod == POP3_HAS_AUTH_NONE)
+        {
+            MOZ_LOG(POP3LOGMODULE, LogLevel::Debug, (POP3LOG("login succeeded")));
+            m_nsIPop3Sink->SetUserAuthenticated(true);
+            ClearFlag(POP3_PASSWORD_FAILED);
+            if (m_pop3ConData->verify_logon)
+              m_pop3ConData->next_state = POP3_SEND_QUIT;
+            else
+              m_pop3ConData->next_state = (m_pop3ConData->get_url)
+                                          ? POP3_SEND_GURL : POP3_SEND_STAT;
+        }
+        else
+            m_pop3ConData->next_state = POP3_SEND_PASSWORD;
+    }
+    else
+    {
+        MOZ_LOG(POP3LOGMODULE, LogLevel::Debug, (POP3LOG("command did not succeed")));
+        // response code received shows that login failed not because of
+        // wrong credential -> stop login without retry or pw dialog, only alert
+        // parameter list -> user
+        nsCString userName;
+        nsCOMPtr<nsIMsgIncomingServer> server = do_QueryInterface(m_pop3Server);
+        nsresult rv = server->GetRealUsername(userName);
+        NS_ENSURE_SUCCESS(rv, -1);
+        NS_ConvertUTF8toUTF16 userNameUTF16(userName);
+        const char16_t* params[] = { userNameUTF16.get() };
+        if (TestFlag(POP3_STOPLOGIN))
+        {
+          if (m_password_already_sent)
+            return Error("pop3PasswordFailed", params, 1);
+
+          return Error("pop3UsernameFailure");
+        }
+        // response code received shows that server is certain about the
+        // credential was wrong -> no fallback, show alert and pw dialog
+        if (TestFlag(POP3_AUTH_FAILURE))
+        {
+            MOZ_LOG(POP3LOGMODULE, LogLevel::Debug,
+                    (POP3LOG("auth failure, setting password failed")));
+            if (m_password_already_sent)
+              Error("pop3PasswordFailed", params, 1);
+            else
+              Error("pop3UsernameFailure");
+            SetFlag(POP3_PASSWORD_FAILED);
+            ClearFlag(POP3_AUTH_FAILURE);
+            return 0;
+        }
+
+        // We have no certain response code -> fallback and try again.
+        // Mark the auth method failed, to use a different method next round.
+        MarkAuthMethodAsFailed(m_currentAuthMethod);
+
+        if (m_currentAuthMethod == POP3_HAS_AUTH_USER &&
+            !m_password_already_sent)
+        {
+            MOZ_LOG(POP3LOGMODULE, LogLevel::Debug, (POP3LOG("USER username failed")));
+            // if USER auth method failed before sending the password,
+            // the username was wrong.
+            // no fallback but return error
+            return Error("pop3UsernameFailure");
+        }
+
+        // If we have no auth method left, ask user to try with new password
+        rv = ChooseAuthMethod();
+        if (NS_FAILED(rv))
+        {
+            MOZ_LOG(POP3LOGMODULE, LogLevel::Error,
+                    (POP3LOG("POP: no auth methods remaining, setting password failure")));
+            /* Sever the connection and go back to the `read password' state,
+               which, upon success, will re-open the connection.  Set a flag
+               which causes the prompt to be different that time (to indicate
+               that the old password was bogus.)
+
+               But if we're just checking for new mail (biff) then don't bother
+               prompting the user for a password: just fail silently.
+            */
+            SetFlag(POP3_PASSWORD_FAILED);
+            Error("pop3PasswordFailed", params, 1);
+            return 0;
+        }
+        MOZ_LOG(POP3LOGMODULE, LogLevel::Debug,
+                (POP3LOG("still have some auth methods to try")));
+
+        // TODO needed?
+        //m_pop3Server->SetPop3CapabilityFlags(m_pop3ConData->capability_flags);
+
+        m_pop3ConData->command_succeeded = true;
+
+        m_pop3ConData->next_state = POP3_PROCESS_AUTH;
+    }
+
+    if (TestCapFlag(POP3_AUTH_MECH_UNDEFINED))
+    {
+        ClearCapFlag(POP3_AUTH_MECH_UNDEFINED);
+        m_pop3Server->SetPop3CapabilityFlags(m_pop3ConData->capability_flags);
+    }
+
+    m_pop3ConData->pause_for_read = false;
+
+    return 0;
+}
+
+// LOGIN consists of three steps not two as USER/PASS or CRAM-MD5,
+// so we've to start here and continue in SendUsername if the server
+// responds + to "AUTH LOGIN"
+int32_t nsPop3Protocol::AuthLogin()
+{
+    nsAutoCString command("AUTH LOGIN" CRLF);
+    m_pop3ConData->next_state_after_response = POP3_AUTH_LOGIN_RESPONSE;
+    m_pop3ConData->pause_for_read = true;
+
+    return Pop3SendData(command.get());
+}
+
+int32_t nsPop3Protocol::AuthLoginResponse()
+{
+    // need the test to be here instead in NextAuthStep() to
+    // differentiate between command AUTH LOGIN failed and
+    // sending username using LOGIN mechanism failed.
+    if (!m_pop3ConData->command_succeeded)
+    {
+        // we failed with LOGIN, remove it
+        MarkAuthMethodAsFailed(POP3_HAS_AUTH_LOGIN);
+        m_pop3ConData->next_state = POP3_PROCESS_AUTH;
+    }
+    else
+        m_pop3ConData->next_state = POP3_SEND_USERNAME;
+
+    m_pop3ConData->pause_for_read = false;
+
+    return 0;
+}
+
+// NTLM, like LOGIN consists of three steps not two as USER/PASS or CRAM-MD5,
+// so we've to start here and continue in SendUsername if the server
+// responds + to "AUTH NTLM"
+int32_t nsPop3Protocol::AuthNtlm()
+{
+    nsAutoCString command (m_currentAuthMethod == POP3_HAS_AUTH_MSN
+          ? "AUTH MSN" CRLF : "AUTH NTLM" CRLF);
+    m_pop3ConData->next_state_after_response = POP3_AUTH_NTLM_RESPONSE;
+    m_pop3ConData->pause_for_read = true;
+
+    return Pop3SendData(command.get());
+}
+
+int32_t nsPop3Protocol::AuthNtlmResponse()
+{
+    // need the test to be here instead in NextAuthStep() to
+    // differentiate between command AUTH NTLM failed and
+    // sending username using NTLM mechanism failed.
+    if (!m_pop3ConData->command_succeeded)
+    {
+        MarkAuthMethodAsFailed(POP3_HAS_AUTH_NTLM);
+        MarkAuthMethodAsFailed(POP3_HAS_AUTH_MSN);
+        m_pop3ConData->next_state = POP3_PROCESS_AUTH;
+    }
+    else
+        m_pop3ConData->next_state = POP3_SEND_USERNAME;
+
+    m_pop3ConData->pause_for_read = false;
+
+    return 0;
+}
+
+int32_t nsPop3Protocol::AuthGSSAPI()
+{
+    MOZ_LOG(POP3LOGMODULE, LogLevel::Debug, (POP3LOG("AuthGSSAPI()")));
+    nsCOMPtr<nsIMsgIncomingServer> server = do_QueryInterface(m_pop3Server);
+    if (server) {
+        nsAutoCString cmd;
+        nsAutoCString service("pop@");
+        nsCString hostName;
+        nsresult rv;
+        server->GetRealHostName(hostName);
+        service.Append(hostName);
+        rv = DoGSSAPIStep1(service.get(), m_username.get(), cmd);
+        if (NS_SUCCEEDED(rv)) {
+            m_GSSAPICache.Assign(cmd);
+            m_pop3ConData->next_state_after_response = POP3_AUTH_GSSAPI_FIRST;
+            m_pop3ConData->pause_for_read = true;
+            return Pop3SendData("AUTH GSSAPI" CRLF);
+        }
+    }
+
+    MarkAuthMethodAsFailed(POP3_HAS_AUTH_GSSAPI);
+    m_pop3ConData->next_state = POP3_PROCESS_AUTH;
+    m_pop3ConData->pause_for_read = false;
+    return 0;
+}
+
+int32_t nsPop3Protocol::AuthGSSAPIResponse(bool first)
+{
+    if (!m_pop3ConData->command_succeeded)
+    {
+        if (first)
+            m_GSSAPICache.Truncate();
+        MarkAuthMethodAsFailed(POP3_HAS_AUTH_GSSAPI);
+        m_pop3ConData->next_state = POP3_PROCESS_AUTH;
+        m_pop3ConData->pause_for_read = false;
+        return 0;
+    }
+
+    int32_t result;
+
+    m_pop3ConData->next_state_after_response = POP3_AUTH_GSSAPI_STEP;
+    m_pop3ConData->pause_for_read = true;
+
+    if (first) {
+        m_GSSAPICache += CRLF;
+        result = Pop3SendData(m_GSSAPICache.get());
+        m_GSSAPICache.Truncate();
+    }
+    else {
+        nsAutoCString cmd;
+        MOZ_LOG(POP3LOGMODULE, LogLevel::Debug, (POP3LOG("GSSAPI step 2")));
+        nsresult rv = DoGSSAPIStep2(m_commandResponse, cmd);
+        if (NS_FAILED(rv))
+            cmd = "*";
+        if (rv == NS_SUCCESS_AUTH_FINISHED) {
+            m_pop3ConData->next_state_after_response = POP3_NEXT_AUTH_STEP;
+            m_password_already_sent = true;
+        }
+        cmd += CRLF;
+        result = Pop3SendData(cmd.get());
+    }
+
+    return result;
+}
+
+int32_t nsPop3Protocol::SendUsername()
+{
+    MOZ_LOG(POP3LOGMODULE, LogLevel::Debug, (POP3LOG("SendUsername()")));
+    if(m_username.IsEmpty())
+      return Error("pop3UsernameUndefined");
+
+    // <copied from="SendPassword()">
+    // Needed for NTLM
+
+    // The POP3_SEND_PASSWORD/POP3_WAIT_SEND_PASSWORD states have already
+    // got the password - they will have cancelled if necessary.
+    // If the password is still empty here, don't try to go on.
+    if (m_passwordResult.IsEmpty())
+    {
+      m_pop3ConData->next_state = POP3_ERROR_DONE;
+      return Error("pop3PasswordUndefined");
+    }
+    // </copied>
+
+    nsAutoCString cmd;
+
+    if (m_currentAuthMethod == POP3_HAS_AUTH_NTLM)
+        (void) DoNtlmStep1(m_username.get(), m_passwordResult.get(), cmd);
+    else if (m_currentAuthMethod == POP3_HAS_AUTH_CRAM_MD5)
+        cmd = "AUTH CRAM-MD5";
+    else if (m_currentAuthMethod == POP3_HAS_AUTH_PLAIN)
+        cmd = "AUTH PLAIN";
+    else if (m_currentAuthMethod == POP3_HAS_AUTH_LOGIN)
+    {
+        char *base64Str = PL_Base64Encode(m_username.get(), m_username.Length(), nullptr);
+        cmd = base64Str;
+        PR_Free(base64Str);
+    }
+    else if (m_currentAuthMethod == POP3_HAS_AUTH_USER)
+    {
+        MOZ_LOG(POP3LOGMODULE, LogLevel::Debug, (POP3LOG("USER login")));
+        cmd = "USER ";
+        cmd += m_username;
+    }
+    else
+    {
+      MOZ_LOG(POP3LOGMODULE, LogLevel::Error,
+              (POP3LOG("In nsPop3Protocol::SendUsername(), m_currentAuthMethod is 0x%X, "
+                       "but that is unexpected"), m_currentAuthMethod));
+      return Error("pop3AuthInternalError");
+    }
+
+    cmd += CRLF;
+
+    m_pop3ConData->next_state_after_response = POP3_NEXT_AUTH_STEP;
+
+    m_pop3ConData->pause_for_read = true;
+
+    return Pop3SendData(cmd.get());
+}
+
+int32_t nsPop3Protocol::SendPassword()
+{
+  MOZ_LOG(POP3LOGMODULE, LogLevel::Debug, (POP3LOG("SendPassword()")));
+  if (m_username.IsEmpty())
+    return Error("pop3UsernameUndefined");
+
+  // <copied to="SendUsername()">
+  // Needed here, too, because APOP skips SendUsername()
+  // The POP3_SEND_PASSWORD/POP3_WAIT_SEND_PASSWORD states have already
+  // got the password - they will have cancelled if necessary.
+  // If the password is still empty here, don't try to go on.
+  if (m_passwordResult.IsEmpty())
+  {
+    m_pop3ConData->next_state = POP3_ERROR_DONE;
+    return Error("pop3PasswordUndefined");
+  }
+  // </copied>
+
+  nsAutoCString cmd;
+  nsresult rv;
+
+  if (m_currentAuthMethod == POP3_HAS_AUTH_NTLM)
+    rv = DoNtlmStep2(m_commandResponse, cmd);
+  else if (m_currentAuthMethod == POP3_HAS_AUTH_CRAM_MD5)
+  {
+    MOZ_LOG(POP3LOGMODULE, LogLevel::Debug, (POP3LOG("CRAM login")));
+    char buffer[512]; // TODO nsAutoCString
+    unsigned char digest[DIGEST_LENGTH];
+
+    char *decodedChallenge = PL_Base64Decode(m_commandResponse.get(),
+    m_commandResponse.Length(), nullptr);
+
+    if (decodedChallenge)
+      rv = MSGCramMD5(decodedChallenge, strlen(decodedChallenge),
+                      m_passwordResult.get(), m_passwordResult.Length(), digest);
+    else
+      rv = NS_ERROR_NULL_POINTER;
+
+    if (NS_SUCCEEDED(rv))
+    {
+      nsAutoCString encodedDigest;
+      char hexVal[8];
+
+      for (uint32_t j = 0; j < 16; j++)
+      {
+        PR_snprintf (hexVal,8, "%.2x", 0x0ff & (unsigned short)digest[j]);
+        encodedDigest.Append(hexVal);
+      }
+
+      PR_snprintf(buffer, sizeof(buffer), "%s %s", m_username.get(),
+                  encodedDigest.get());
+      char *base64Str = PL_Base64Encode(buffer, strlen(buffer), nullptr);
+      cmd = base64Str;
+      PR_Free(base64Str);
+    }
+
+    if (NS_FAILED(rv))
+      cmd = "*";
+  }
+  else if (m_currentAuthMethod == POP3_HAS_AUTH_APOP)
+  {
+    MOZ_LOG(POP3LOGMODULE, LogLevel::Debug, (POP3LOG("APOP login")));
+    char buffer[512];
+    unsigned char digest[DIGEST_LENGTH];
+
+    rv = MSGApopMD5(m_ApopTimestamp.get(), m_ApopTimestamp.Length(),
+                    m_passwordResult.get(), m_passwordResult.Length(), digest);
+
+    if (NS_SUCCEEDED(rv))
+    {
+      nsAutoCString encodedDigest;
+      char hexVal[8];
+
+      for (uint32_t j=0; j<16; j++)
+      {
+        PR_snprintf (hexVal,8, "%.2x", 0x0ff & (unsigned short)digest[j]);
+        encodedDigest.Append(hexVal);
+      }
+
+      PR_snprintf(buffer, sizeof(buffer), "APOP %s %s", m_username.get(),
+                  encodedDigest.get());
+      cmd = buffer;
+    }
+
+    if (NS_FAILED(rv))
+      cmd = "*";
+  }
+  else if (m_currentAuthMethod == POP3_HAS_AUTH_PLAIN)
+  {
+    MOZ_LOG(POP3LOGMODULE, LogLevel::Debug, (POP3LOG("PLAIN login")));
+    // workaround for IPswitch's IMail server software
+    // this server goes into LOGIN mode even if we send "AUTH PLAIN"
+    // "VXNlc" is the beginning of the base64 encoded prompt ("Username:") for LOGIN
+    if (StringBeginsWith(m_commandResponse, NS_LITERAL_CSTRING("VXNlc")))
+    {
+      // disable PLAIN and enable LOGIN (in case it's not already enabled)
+      ClearCapFlag(POP3_HAS_AUTH_PLAIN);
+      SetCapFlag(POP3_HAS_AUTH_LOGIN);
+      m_pop3Server->SetPop3CapabilityFlags(m_pop3ConData->capability_flags);
+
+      // reenter authentication again at LOGIN response handler
+      m_pop3ConData->next_state = POP3_AUTH_LOGIN_RESPONSE;
+      m_pop3ConData->pause_for_read = false;
+      return 0;
+    }
+
+    char plain_string[512]; // TODO nsCString
+    int len = 1; /* first <NUL> char */
+    memset(plain_string, 0, 512);
+    PR_snprintf(&plain_string[1], 510, "%s", m_username.get());
+    len += m_username.Length();
+    len++; /* second <NUL> char */
+    PR_snprintf(&plain_string[len], 511-len, "%s", m_passwordResult.get());
+    len += m_passwordResult.Length();
+
+    char *base64Str = PL_Base64Encode(plain_string, len, nullptr);
+    cmd = base64Str;
+    PR_Free(base64Str);
+  }
+  else if (m_currentAuthMethod == POP3_HAS_AUTH_LOGIN)
+  {
+    MOZ_LOG(POP3LOGMODULE, LogLevel::Debug, (POP3LOG("LOGIN password")));
+    char * base64Str =
+        PL_Base64Encode(m_passwordResult.get(), m_passwordResult.Length(),
+                        nullptr);
+    cmd = base64Str;
+    PR_Free(base64Str);
+  }
+  else if (m_currentAuthMethod == POP3_HAS_AUTH_USER)
+  {
+    MOZ_LOG(POP3LOGMODULE, LogLevel::Debug, (POP3LOG("PASS password")));
+    cmd = "PASS ";
+    cmd += m_passwordResult;
+  }
+  else
+  {
+    MOZ_LOG(POP3LOGMODULE, LogLevel::Error,
+            (POP3LOG("In nsPop3Protocol::SendPassword(), m_currentAuthMethod is %X, "
+                     "but that is unexpected"), m_currentAuthMethod));
+    return Error("pop3AuthInternalError");
+  }
+
+  cmd += CRLF;
+
+  // TODO needed?
+  //m_pop3Server->SetPop3CapabilityFlags(m_pop3ConData->capability_flags);
+
+  m_pop3ConData->next_state_after_response = POP3_NEXT_AUTH_STEP;
+
+  m_pop3ConData->pause_for_read = true;
+
+  m_password_already_sent = true;
+  m_lastPasswordSent = m_passwordResult;
+  return Pop3SendData(cmd.get(), true);
+}
+
+int32_t nsPop3Protocol::SendStatOrGurl(bool sendStat)
+{
+  nsAutoCString cmd;
+  if (sendStat)
+  {
+    cmd  = "STAT" CRLF;
+    m_pop3ConData->next_state_after_response = POP3_GET_STAT;
+  }
+  else
+  {
+    cmd = "GURL" CRLF;
+    m_pop3ConData->next_state_after_response = POP3_GURL_RESPONSE;
+  }
+  return Pop3SendData(cmd.get());
+}
+
+
+int32_t
+nsPop3Protocol::SendStat()
+{
+  return SendStatOrGurl(true);
+}
+
+
+int32_t
+nsPop3Protocol::GetStat()
+{
+  // check stat response
+  if (!m_pop3ConData->command_succeeded)
+    return Error("pop3StatFail");
+
+    /* stat response looks like:  %d %d
+     * The first number is the number of articles
+     * The second number is the number of bytes
+     *
+     *  grab the first and second arg of stat response
+     */
+  nsCString oldStr (m_commandResponse);
+  char *newStr = oldStr.BeginWriting();
+  char *num = NS_strtok(" ", &newStr);  // msg num
+  if (num)
+  {
+    m_pop3ConData->number_of_messages = atol(num);  // bytes
+    num = NS_strtok(" ", &newStr);
+    m_commandResponse = newStr;
+    if (num)
+      m_totalFolderSize = nsCRT::atoll(num);  //we always initialize m_totalFolderSize to 0
+  }
+  else
+    m_pop3ConData->number_of_messages = 0;
+
+  m_pop3ConData->really_new_messages = 0;
+  m_pop3ConData->real_new_counter = 1;
+
+  m_totalDownloadSize = -1; // Means we need to calculate it, later.
+
+  if (m_pop3ConData->number_of_messages <= 0)
+  {
+    // We're all done. We know we have no mail.
+    m_pop3ConData->next_state = POP3_SEND_QUIT;
+    PL_HashTableEnumerateEntries(m_pop3ConData->uidlinfo->hash, hash_clear_mapper, nullptr);
+    // Hack - use nsPop3Sink to wipe out any stale Partial messages
+    m_nsIPop3Sink->BeginMailDelivery(false, nullptr, nullptr);
+    m_nsIPop3Sink->AbortMailDelivery(this);
+    return(0);
+  }
+
+  /* We're just checking for new mail, and we're not playing any games that
+     involve keeping messages on the server.  Therefore, we now know enough
+     to finish up.  If we had no messages, that would have been handled
+     above; therefore, we know we have some new messages. 
+  */
+  if (m_pop3ConData->only_check_for_new_mail && !m_pop3ConData->leave_on_server)
+  {
+    m_nsIPop3Sink->SetBiffStateAndUpdateFE(nsIMsgFolder::nsMsgBiffState_NewMail,
+                                           m_pop3ConData->number_of_messages,
+                                           true);
+    m_pop3ConData->next_state = POP3_SEND_QUIT;
+    return(0);
+  }
+
+
+  if (!m_pop3ConData->only_check_for_new_mail)
+  {
+      /* The following was added to prevent the loss of Data when we try and
+         write to somewhere we don't have write access error to (See bug 62480)
+         (Note: This is only a temp hack until the underlying XPCOM is fixed
+         to return errors) */
+
+      nsresult rv;
+      nsCOMPtr <nsIMsgWindow> msgWindow;
+      nsCOMPtr<nsIMsgMailNewsUrl> mailnewsUrl = do_QueryInterface(m_url);
+      if (mailnewsUrl)
+        rv = mailnewsUrl->GetMsgWindow(getter_AddRefs(msgWindow));
+//      NS_ASSERTION(NS_SUCCEEDED(rv) && msgWindow, "no msg window");
+
+      rv = m_nsIPop3Sink->BeginMailDelivery(m_pop3ConData->only_uidl != nullptr, msgWindow,
+                                                    &m_pop3ConData->msg_del_started);
+      if (NS_FAILED(rv))
+      {
+        m_nsIPop3Sink->AbortMailDelivery(this);
+        if (rv == NS_MSG_FOLDER_BUSY) {
+          nsCOMPtr<nsIMsgIncomingServer> server = do_QueryInterface(m_pop3Server);
+          nsString accountName;
+          rv = server->GetPrettyName(accountName);
+          NS_ENSURE_SUCCESS(rv, -1);
+
+          const char16_t *params[] = { accountName.get() };
+          return Error("pop3ServerBusy", params, 1);
+        }
+
+        return Error("pop3MessageWriteError");
+      }
+
+      if(!m_pop3ConData->msg_del_started)
+        return Error("pop3MessageWriteError");
+  }
+
+  m_pop3ConData->next_state = POP3_SEND_LIST;
+  return 0;
+}
+
+
+
+int32_t
+nsPop3Protocol::SendGurl()
+{
+    if (m_pop3ConData->capability_flags == POP3_CAPABILITY_UNDEFINED ||
+        TestCapFlag(POP3_GURL_UNDEFINED | POP3_HAS_GURL))
+        return SendStatOrGurl(false);
+    else
+        return -1;
+}
+
+
+int32_t
+nsPop3Protocol::GurlResponse()
+{
+    ClearCapFlag(POP3_GURL_UNDEFINED);
+
+    if (m_pop3ConData->command_succeeded)
+    {
+        SetCapFlag(POP3_HAS_GURL);
+        if (m_nsIPop3Sink)
+            m_nsIPop3Sink->SetMailAccountURL(m_commandResponse);
+    }
+    else
+    {
+        ClearCapFlag(POP3_HAS_GURL);
+    }
+    m_pop3Server->SetPop3CapabilityFlags(m_pop3ConData->capability_flags);
+    m_pop3ConData->next_state = POP3_SEND_QUIT;
+
+    return 0;
+}
+
+int32_t nsPop3Protocol::SendList()
+{
+    // check for server returning number of messages that will cause the calculation
+    // of the size of the block for msg_info to
+    // overflow a 32 bit int, in turn causing us to allocate a block of memory much
+    // smaller than we think we're allocating, and
+    // potentially allowing the server to make us overwrite memory outside our heap
+    // block.
+
+    if (m_pop3ConData->number_of_messages > (int) (0xFFFFF000 / sizeof(Pop3MsgInfo)))
+        return MK_OUT_OF_MEMORY;
+
+
+    m_pop3ConData->msg_info = (Pop3MsgInfo *)
+      PR_CALLOC(sizeof(Pop3MsgInfo) * m_pop3ConData->number_of_messages);
+    if (!m_pop3ConData->msg_info)
+        return(MK_OUT_OF_MEMORY);
+    m_pop3ConData->next_state_after_response = POP3_GET_LIST;
+    m_listpos = 0;
+    return Pop3SendData("LIST" CRLF);
+}
+
+
+
+int32_t
+nsPop3Protocol::GetList(nsIInputStream* inputStream,
+                        uint32_t length)
+{
+  /* check list response
+  * This will get called multiple times
+  * but it's alright since command_succeeded
+  * will remain constant
+  */
+  if(!m_pop3ConData->command_succeeded)
+    return Error("pop3ListFailure");
+
+  uint32_t ln = 0;
+  bool pauseForMoreData = false;
+  nsresult rv;
+  char *line = m_lineStreamBuffer->ReadNextLine(inputStream, ln, pauseForMoreData, &rv);
+  if (NS_FAILED(rv))
+    return -1;
+
+  if (pauseForMoreData || !line)
+  {
+    m_pop3ConData->pause_for_read = true;
+    PR_Free(line);
+    return(ln);
+  }
+
+  MOZ_LOG(POP3LOGMODULE, LogLevel::Info, (POP3LOG("RECV: %s"), line));
+
+  /* parse the line returned from the list command
+  * it looks like
+  * #msg_number #bytes
+  *
+  * list data is terminated by a ".CRLF" line
+  */
+  if (!PL_strcmp(line, "."))
+  {
+    // limit the list if fewer entries than given in STAT response
+    if(m_listpos < m_pop3ConData->number_of_messages)
+      m_pop3ConData->number_of_messages = m_listpos;
+    m_pop3ConData->next_state = POP3_SEND_UIDL_LIST;
+    m_pop3ConData->pause_for_read = false;
+    PR_Free(line);
+    return(0);
+  }
+
+  char *newStr = line;
+  char *token = NS_strtok(" ", &newStr);
+  if (token)
+  {
+    int32_t msg_num = atol(token);
+
+    if (++m_listpos <= m_pop3ConData->number_of_messages)
+    {
+      token = NS_strtok(" ", &newStr);
+      if (token)
+      {
+        m_pop3ConData->msg_info[m_listpos-1].size = atol(token);
+        m_pop3ConData->msg_info[m_listpos-1].msgnum = msg_num;
+      }
+    }
+  }
+
+  PR_Free(line);
+  return(0);
+}
+
+
+/* UIDL and XTND are both unsupported for this mail server.
+   If not enabled any advanced features, we're able to live
+   without them. We're simply downloading and deleting everything
+   on the server.
+
+   Advanced features are:
+   *'Keep Mail on Server' with aging or deletion support
+   *'Fetch Headers Only'
+   *'Limit Message Size'
+   *only download a specific UID
+
+   These require knowledge of of all messages UID's on the server at
+   least when it comes to deleting deleting messages on server that
+   have been deleted on client or vice versa. TOP doesn't help here
+   without generating huge traffic and is mostly not supported at all
+   if the server lacks UIDL and XTND XLST.
+
+   In other cases the user has to join the 20th century.
+   Tell the user this, and refuse to download any messages until
+   they've gone into preferences and turned off any of the above
+   prefs.
+*/
+int32_t nsPop3Protocol::HandleNoUidListAvailable()
+{
+  m_pop3ConData->pause_for_read = false;
+
+  if(!m_pop3ConData->leave_on_server &&
+     !m_pop3ConData->headers_only &&
+     m_pop3ConData->size_limit <= 0 &&
+     !m_pop3ConData->only_uidl)
+  {
+    m_pop3ConData->next_state = POP3_GET_MSG;
+    return 0;
+  }
+  m_pop3ConData->next_state = POP3_SEND_QUIT;
+  nsCString hostName;
+  nsCOMPtr<nsIMsgIncomingServer> server = do_QueryInterface(m_pop3Server);
+  nsresult rv = server->GetRealHostName(hostName);
+  NS_ENSURE_SUCCESS(rv, -1);
+  NS_ConvertASCIItoUTF16 hostNameUnicode(hostName);
+  const char16_t *params[] = { hostNameUnicode.get() };
+  return Error("pop3ServerDoesNotSupportUidlEtc", params, 1);  
+}
+
+
+/* km
+ *
+ *  net_pop3_send_xtnd_xlst_msgid
+ *
+ *  Process state: POP3_SEND_XTND_XLST_MSGID
+ *
+ *  If we get here then UIDL is not supported by the mail server.
+ *  Some mail servers support a similar command:
+ *
+ *    XTND XLST Message-Id
+ *
+ *  Here is a sample transaction from a QUALCOMM server
+
+ >>XTND XLST Message-Id
+ <<+OK xlst command accepted; headers coming.
+ <<1 Message-ID: <3117E4DC.2699@netscape.invalid>
+ <<2 Message-Id: <199602062335.PAA19215@lemon.example.com>
+
+ * This function will send the xtnd command and put us into the
+ * POP3_GET_XTND_XLST_MSGID state
+ *
+*/
+int32_t nsPop3Protocol::SendXtndXlstMsgid()
+{
+  if (TestCapFlag(POP3_HAS_XTND_XLST | POP3_XTND_XLST_UNDEFINED))
+  {
+    m_pop3ConData->next_state_after_response = POP3_GET_XTND_XLST_MSGID;
+    m_pop3ConData->pause_for_read = true;
+    m_listpos = 0;
+    return Pop3SendData("XTND XLST Message-Id" CRLF);
+  }
+  else
+    return HandleNoUidListAvailable();
+}
+
+
+/* km
+ *
+ *  net_pop3_get_xtnd_xlst_msgid
+ *
+ *  This code was created from the net_pop3_get_uidl_list boiler plate.
+ *  The difference is that the XTND reply strings have one more token per
+ *  string than the UIDL reply strings do.
+ *
+ */
+
+int32_t
+nsPop3Protocol::GetXtndXlstMsgid(nsIInputStream* inputStream,
+                                 uint32_t length)
+{
+  /* check list response
+  * This will get called multiple times
+  * but it's alright since command_succeeded
+  * will remain constant
+  */
+  ClearCapFlag(POP3_XTND_XLST_UNDEFINED);
+
+  if (!m_pop3ConData->command_succeeded)
+  {
+    ClearCapFlag(POP3_HAS_XTND_XLST);
+    m_pop3Server->SetPop3CapabilityFlags(m_pop3ConData->capability_flags);
+    HandleNoUidListAvailable();
+    return(0);
+  }
+  else
+  {
+    SetCapFlag(POP3_HAS_XTND_XLST);
+    m_pop3Server->SetPop3CapabilityFlags(m_pop3ConData->capability_flags);
+  }
+
+  uint32_t ln = 0;
+  bool pauseForMoreData = false;
+  nsresult rv;
+  char *line = m_lineStreamBuffer->ReadNextLine(inputStream, ln, pauseForMoreData, &rv);
+  if (NS_FAILED(rv))
+    return -1;
+
+  if (pauseForMoreData || !line)
+  {
+    m_pop3ConData->pause_for_read = true;
+    PR_Free(line);
+    return ln;
+  }
+
+  MOZ_LOG(POP3LOGMODULE, LogLevel::Info, (POP3LOG("RECV: %s"), line));
+
+  /* parse the line returned from the list command
+  * it looks like
+  * 1 Message-ID: <3117E4DC.2699@example.com>
+  *
+  * list data is terminated by a ".CRLF" line
+  */
+  if (!PL_strcmp(line, "."))
+  {
+    // limit the list if fewer entries than given in STAT response
+    if(m_listpos < m_pop3ConData->number_of_messages)
+      m_pop3ConData->number_of_messages = m_listpos;
+    m_pop3ConData->list_done = true;
+    m_pop3ConData->next_state = POP3_GET_MSG;
+    m_pop3ConData->pause_for_read = false;
+    PR_Free(line);
+    return(0);
+  }
+
+  char *newStr = line;
+  char *token = NS_strtok(" ", &newStr);  // msg num
+  if (token)
+  {
+    int32_t msg_num = atol(token);
+    if (++m_listpos <= m_pop3ConData->number_of_messages)
+    {
+      NS_strtok(" ", &newStr);  // eat message ID token
+      const char *uid = NS_strtok(" ", &newStr); // not really a UID but a unique token -km
+      if (!uid)
+        /* This is bad.  The server didn't give us a UIDL for this message.
+        I've seen this happen when somehow the mail spool has a message
+        that contains a header that reads "X-UIDL: \n".  But how that got
+        there, I have no idea; must be a server bug.  Or something. */
+        uid = "";
+
+      // seeking right entry, but try the one that should it be first
+      int32_t i;
+      if(m_pop3ConData->msg_info[m_listpos - 1].msgnum == msg_num)
+        i = m_listpos - 1;
+      else
+        for(i = 0; i < m_pop3ConData->number_of_messages &&
+                   m_pop3ConData->msg_info[i].msgnum != msg_num; i++)
+          ;
+
+      // only if found a matching slot
+      if (i < m_pop3ConData->number_of_messages)
+      {
+        // to protect us from memory leak in case of getting a msg num twice
+        m_pop3ConData->msg_info[i].uidl = PL_strdup(uid);
+        if (!m_pop3ConData->msg_info[i].uidl)
+        {
+          PR_Free(line);
+          return MK_OUT_OF_MEMORY;
+        }
+      }
+    }
+  }
+
+  PR_Free(line);
+  return(0);
+}
+
+
+int32_t nsPop3Protocol::SendUidlList()
+{
+    if (TestCapFlag(POP3_HAS_UIDL | POP3_UIDL_UNDEFINED))
+    {
+      m_pop3ConData->next_state_after_response = POP3_GET_UIDL_LIST;
+      m_pop3ConData->pause_for_read = true;
+      m_listpos = 0;
+      return Pop3SendData("UIDL" CRLF);
+    }
+    else
+      return SendXtndXlstMsgid();
+}
+
+
+int32_t nsPop3Protocol::GetUidlList(nsIInputStream* inputStream,
+                            uint32_t length)
+{
+    /* check list response
+     * This will get called multiple times
+     * but it's alright since command_succeeded
+     * will remain constant
+     */
+    ClearCapFlag(POP3_UIDL_UNDEFINED);
+
+    if (!m_pop3ConData->command_succeeded)
+    {
+      m_pop3ConData->next_state = POP3_SEND_XTND_XLST_MSGID;
+      m_pop3ConData->pause_for_read = false;
+      ClearCapFlag(POP3_HAS_UIDL);
+      m_pop3Server->SetPop3CapabilityFlags(m_pop3ConData->capability_flags);
+      return(0);
+    }
+    else
+    {
+      SetCapFlag(POP3_HAS_UIDL);
+      m_pop3Server->SetPop3CapabilityFlags(m_pop3ConData->capability_flags);
+    }
+
+    uint32_t ln = 0;
+    bool pauseForMoreData = false;
+    nsresult rv;
+    char *line = m_lineStreamBuffer->ReadNextLine(inputStream, ln, pauseForMoreData, &rv);
+    if (NS_FAILED(rv))
+      return -1;
+
+    if (pauseForMoreData || !line)
+    {
+      PR_Free(line);
+      m_pop3ConData->pause_for_read = true;
+      return ln;
+    }
+
+    MOZ_LOG(POP3LOGMODULE, LogLevel::Info, (POP3LOG("RECV: %s"), line));
+
+    /* parse the line returned from the list command
+     * it looks like
+     * #msg_number uidl
+     *
+     * list data is terminated by a ".CRLF" line
+     */
+    if (!PL_strcmp(line, "."))
+    {
+      // limit the list if fewer entries than given in STAT response
+      if (m_listpos < m_pop3ConData->number_of_messages)
+        m_pop3ConData->number_of_messages = m_listpos;
+      m_pop3ConData->list_done = true;
+      m_pop3ConData->next_state = POP3_GET_MSG;
+      m_pop3ConData->pause_for_read = false;
+      PR_Free(line);
+      return(0);
+    }
+
+    char *newStr = line;
+    char *token = NS_strtok(" ", &newStr);  // msg num
+    if (token)
+    {
+      int32_t msg_num = atol(token);
+      if (++m_listpos <= m_pop3ConData->number_of_messages)
+      {
+        const char *uid = NS_strtok(" ", &newStr); // UID
+        if (!uid)
+          /* This is bad.  The server didn't give us a UIDL for this message.
+             I've seen this happen when somehow the mail spool has a message
+             that contains a header that reads "X-UIDL: \n".  But how that got
+             there, I have no idea; must be a server bug.  Or something. */
+          uid = "";
+
+        // seeking right entry, but try the one that should it be first
+        int32_t i;
+        if(m_pop3ConData->msg_info[m_listpos - 1].msgnum == msg_num)
+          i = m_listpos - 1;
+        else
+          for(i = 0; i < m_pop3ConData->number_of_messages &&
+                     m_pop3ConData->msg_info[i].msgnum != msg_num; i++)
+            ;
+
+        // only if found a matching slot
+        if (i < m_pop3ConData->number_of_messages)
+        {
+          // to protect us from memory leak in case of getting a msg num twice
+          m_pop3ConData->msg_info[i].uidl = PL_strdup(uid);
+          if (!m_pop3ConData->msg_info[i].uidl)
+          {
+            PR_Free(line);
+            return MK_OUT_OF_MEMORY;
+          }
+        }
+      }
+    }
+    PR_Free(line);
+    return(0);
+}
+
+
+
+/* this function decides if we are going to do a
+ * normal RETR or a TOP.  The first time, it also decides the total number
+ * of bytes we're probably going to get.
+ */
+int32_t nsPop3Protocol::GetMsg()
+{
+  int32_t popstateTimestamp = TimeInSecondsFromPRTime(PR_Now());
+
+  if (m_pop3ConData->last_accessed_msg >= m_pop3ConData->number_of_messages)
+  {
+    /* Oh, gee, we're all done. */
+    if(m_pop3ConData->msg_del_started)
+    {
+      if (!m_pop3ConData->only_uidl)
+      {
+        if (m_pop3ConData->only_check_for_new_mail)
+          m_nsIPop3Sink->SetBiffStateAndUpdateFE(m_pop3ConData->biffstate, m_pop3ConData->really_new_messages, true);
+        /* update old style biff */
+        else
+          m_nsIPop3Sink->SetBiffStateAndUpdateFE(nsIMsgFolder::nsMsgBiffState_NewMail, m_pop3ConData->really_new_messages, false);
+      }
+      m_nsIPop3Sink->EndMailDelivery(this);
+    }
+
+    m_pop3ConData->next_state = POP3_SEND_QUIT;
+    return 0;
+  }
+
+  if (m_totalDownloadSize < 0)
+  {
+    /* First time.  Figure out how many bytes we're about to get.
+    If we didn't get any message info, then we are going to get
+    everything, and it's easy.  Otherwise, if we only want one
+    uidl, than that's the only one we'll get.  Otherwise, go
+    through each message info, decide if we're going to get that
+    message, and add the number of bytes for it. When a message is too
+    large (per user's preferences) only add the size we are supposed
+    to get. */
+    m_pop3ConData->really_new_messages = 0;
+    m_pop3ConData->real_new_counter = 1;
+    if (m_pop3ConData->msg_info)
+    {
+      m_totalDownloadSize = 0;
+      for (int32_t i = 0; i < m_pop3ConData->number_of_messages; i++)
+      {
+        if (m_pop3ConData->only_uidl)
+        {
+          if (m_pop3ConData->msg_info[i].uidl &&
+            !PL_strcmp(m_pop3ConData->msg_info[i].uidl, m_pop3ConData->only_uidl))
+          {
+            m_totalDownloadSize = m_pop3ConData->msg_info[i].size;
+            m_pop3ConData->really_new_messages = 1;
+            // we are only getting one message
+            m_pop3ConData->real_new_counter = 1;
+            break;
+          }
+          continue;
+        }
+
+        char c = 0;
+        popstateTimestamp = TimeInSecondsFromPRTime(PR_Now());
+        if (m_pop3ConData->msg_info[i].uidl)
+        {
+          Pop3UidlEntry *uidlEntry = (Pop3UidlEntry *) PL_HashTableLookup(m_pop3ConData->uidlinfo->hash,
+            m_pop3ConData->msg_info[i].uidl);
+          if (uidlEntry)
+          {
+            c = uidlEntry->status;
+            popstateTimestamp = uidlEntry->dateReceived;
+          }
+        }
+        if ((c == KEEP) && !m_pop3ConData->leave_on_server)
+        { /* This message has been downloaded but kept on server, we
+           * no longer want to keep it there */
+          if (!m_pop3ConData->newuidl)
+          {
+            m_pop3ConData->newuidl = PL_NewHashTable(20, PL_HashString, PL_CompareStrings,
+                                              PL_CompareValues, &gHashAllocOps, nullptr);
+            if (!m_pop3ConData->newuidl)
+              return MK_OUT_OF_MEMORY;
+          }
+          c = DELETE_CHAR;
+          // Mark message to be deleted in new table
+          put_hash(m_pop3ConData->newuidl,
+            m_pop3ConData->msg_info[i].uidl, DELETE_CHAR, popstateTimestamp);
+          // and old one too
+          put_hash(m_pop3ConData->uidlinfo->hash,
+            m_pop3ConData->msg_info[i].uidl, DELETE_CHAR, popstateTimestamp);
+        }
+        if ((c != KEEP) && (c != DELETE_CHAR) && (c != TOO_BIG))
+        { // message left on server
+          m_totalDownloadSize += m_pop3ConData->msg_info[i].size;
+          m_pop3ConData->really_new_messages++;
+          // a message we will really download
+        }
+      }
+    }
+    else
+    {
+      m_totalDownloadSize = m_totalFolderSize;
+    }
+    if (m_pop3ConData->only_check_for_new_mail)
+    {
+      if (m_totalDownloadSize > 0)
+      {
+        m_pop3ConData->biffstate = nsIMsgFolder::nsMsgBiffState_NewMail;
+        m_nsIPop3Sink->SetBiffStateAndUpdateFE(nsIMsgFolder::nsMsgBiffState_NewMail, m_pop3ConData->really_new_messages, true);
+      }
+      m_pop3ConData->next_state = POP3_SEND_QUIT;
+      return(0);
+    }
+    /* get the amount of available space on the drive
+     * and make sure there is enough
+     */
+    if (m_totalDownloadSize > 0) // skip all this if there aren't any messages
+    {
+      nsCOMPtr<nsIMsgFolder> folder;
+
+      // Get the current mailbox folder
+      NS_ENSURE_TRUE(m_nsIPop3Sink, -1);
+      nsresult rv = m_nsIPop3Sink->GetFolder(getter_AddRefs(folder));
+      if (NS_FAILED(rv))
+        return -1;
+
+      nsCOMPtr<nsIMsgMailNewsUrl> mailnewsUrl = do_QueryInterface(m_url, &rv);
+      if (NS_FAILED(rv) || !mailnewsUrl)
+        return -1;
+
+      nsCOMPtr<nsIMsgWindow> msgWindow;
+      (void)mailnewsUrl->GetMsgWindow(getter_AddRefs(msgWindow));
+
+      bool spaceNotAvailable = true;
+      nsCOMPtr<nsIMsgLocalMailFolder> localFolder(do_QueryInterface(folder, &rv));
+      if (NS_FAILED(rv) || !localFolder)
+        return -1;
+
+      // check if we have a reasonable amount of space left
+      rv = localFolder->WarnIfLocalFileTooBig(msgWindow, m_totalDownloadSize, &spaceNotAvailable);
+      if (NS_FAILED(rv) || spaceNotAvailable) {
+#ifdef DEBUG
+        printf("Not enough disk space! Raising error!\n");
+#endif
+        return -1;
+      }
+
+      // Here we know how many messages we're going to download, so let
+      // the pop3 sink know.
+      rv = m_nsIPop3Sink->SetMsgsToDownload(m_pop3ConData->really_new_messages);
+    }
+  }
+
+  /* Look at this message, and decide whether to ignore it, get it, just get
+  the TOP of it, or delete it. */
+
+  // if this is a message we've seen for the first time, we won't find it in
+  // m_pop3ConData-uidlinfo->hash.  By default, we retrieve messages, unless they have a status,
+  // or are too big, in which case we figure out what to do.
+  if (m_prefAuthMethods != POP3_HAS_AUTH_USER && TestCapFlag(POP3_HAS_XSENDER))
+    m_pop3ConData->next_state = POP3_SEND_XSENDER;
+  else
+    m_pop3ConData->next_state = POP3_SEND_RETR;
+  m_pop3ConData->truncating_cur_msg = false;
+  m_pop3ConData->pause_for_read = false;
+  if (m_pop3ConData->msg_info)
+  {
+    Pop3MsgInfo* info = m_pop3ConData->msg_info + m_pop3ConData->last_accessed_msg;
+    if (m_pop3ConData->only_uidl)
+    {
+      if (info->uidl == NULL || PL_strcmp(info->uidl, m_pop3ConData->only_uidl))
+        m_pop3ConData->next_state = POP3_GET_MSG;
+      else
+        m_pop3ConData->next_state = POP3_SEND_RETR;
+    }
+    else
+    {
+      char c = 0;
+      if (!m_pop3ConData->newuidl)
+      {
+        m_pop3ConData->newuidl = PL_NewHashTable(20, PL_HashString, PL_CompareStrings, PL_CompareValues, &gHashAllocOps, nullptr);
+        if (!m_pop3ConData->newuidl)
+          return MK_OUT_OF_MEMORY;
+      }
+      if (info->uidl)
+      {
+        Pop3UidlEntry *uidlEntry = (Pop3UidlEntry *) PL_HashTableLookup(m_pop3ConData->uidlinfo->hash, info->uidl);
+        if (uidlEntry)
+        {
+          c = uidlEntry->status;
+          popstateTimestamp = uidlEntry->dateReceived;
+        }
+      }
+      if (c == DELETE_CHAR)
+      {
+        m_pop3ConData->next_state = POP3_SEND_DELE;
+      }
+      else if (c == KEEP)
+      {
+        // this is a message we've already downloaded and left on server;
+        // Advance to next message.
+        m_pop3ConData->next_state = POP3_GET_MSG;
+      }
+      else if (c == FETCH_BODY)
+      {
+        m_pop3ConData->next_state = POP3_SEND_RETR;
+        PL_HashTableRemove (m_pop3ConData->uidlinfo->hash, (void*)info->uidl);
+      }
+      else if ((c != TOO_BIG) &&
+        (TestCapFlag(POP3_TOP_UNDEFINED | POP3_HAS_TOP)) &&
+        (m_pop3ConData->headers_only ||
+         ((m_pop3ConData->size_limit > 0) &&
+          (info->size > m_pop3ConData->size_limit) &&
+          !m_pop3ConData->only_uidl)) &&
+        info->uidl && *info->uidl)
+      {
+        // message is too big
+        m_pop3ConData->truncating_cur_msg = true;
+        m_pop3ConData->next_state = POP3_SEND_TOP;
+        put_hash(m_pop3ConData->newuidl, info->uidl, TOO_BIG, popstateTimestamp);
+      }
+      else if (c == TOO_BIG)
+      {
+        /* message previously left on server, see if the max download size
+        has changed, because we may want to download the message this time
+        around. Otherwise ignore the message, we have the header. */
+        if ((m_pop3ConData->size_limit > 0) && (info->size <=
+          m_pop3ConData->size_limit))
+          PL_HashTableRemove (m_pop3ConData->uidlinfo->hash, (void*)info->uidl);
+        // remove from our table, and download
+        else
+        {
+          m_pop3ConData->truncating_cur_msg = true;
+          m_pop3ConData->next_state = POP3_GET_MSG;
+          // ignore this message and get next one
+          put_hash(m_pop3ConData->newuidl, info->uidl, TOO_BIG, popstateTimestamp);
+        }
+      }
+
+      if (m_pop3ConData->next_state != POP3_SEND_DELE &&
+          info->uidl)
+      {
+        /* This is a message we have decided to keep on the server. Notate
+            that now for the future. (Don't change the popstate file at all
+            if only_uidl is set; in that case, there might be brand new messages
+            on the server that we *don't* want to mark KEEP; we just want to
+            leave them around until the user next does a GetNewMail.) */
+
+        /* If this is a message we already know about (i.e., it was
+            in popstate.dat already), we need to maintain the original
+            date the message was downloaded. */
+        if (m_pop3ConData->truncating_cur_msg)
+          put_hash(m_pop3ConData->newuidl, info->uidl, TOO_BIG, popstateTimestamp);
+        else
+          put_hash(m_pop3ConData->newuidl, info->uidl, KEEP, popstateTimestamp);
+      }
+    }
+    if (m_pop3ConData->next_state == POP3_GET_MSG)
+      m_pop3ConData->last_accessed_msg++;
+    // Make sure we check the next message next time!
+  }
+  return 0;
+}
+
+
+/* start retreiving just the first 20 lines
+ */
+int32_t nsPop3Protocol::SendTop()
+{
+   char * cmd = PR_smprintf( "TOP %ld %d" CRLF,
+     m_pop3ConData->msg_info[m_pop3ConData->last_accessed_msg].msgnum,
+     m_pop3ConData->headers_only ? 0 : 20);
+   int32_t status = -1;
+   if (cmd)
+   {
+     m_pop3ConData->next_state_after_response = POP3_TOP_RESPONSE;
+     m_pop3ConData->cur_msg_size = -1;
+
+     /* zero the bytes received in message in preparation for
+     * the next
+     */
+     m_bytesInMsgReceived = 0;
+     status = Pop3SendData(cmd);
+   }
+   PR_Free(cmd);
+   return status;
+}
+
+/* send the xsender command
+ */
+int32_t nsPop3Protocol::SendXsender()
+{
+  char * cmd = PR_smprintf("XSENDER %ld" CRLF, m_pop3ConData->msg_info[m_pop3ConData->last_accessed_msg].msgnum);
+  int32_t status = -1;
+  if (cmd)
+  {
+    m_pop3ConData->next_state_after_response = POP3_XSENDER_RESPONSE;
+    status = Pop3SendData(cmd);
+    PR_Free(cmd);
+  }
+  return status;
+}
+
+int32_t nsPop3Protocol::XsenderResponse()
+{
+    m_pop3ConData->seenFromHeader = false;
+    m_senderInfo = "";
+
+    if (m_pop3ConData->command_succeeded) {
+        if (m_commandResponse.Length() > 4)
+            m_senderInfo = m_commandResponse;
+    }
+    else {
+        ClearCapFlag(POP3_HAS_XSENDER);
+        m_pop3Server->SetPop3CapabilityFlags(m_pop3ConData->capability_flags);
+    }
+
+    if (m_pop3ConData->truncating_cur_msg)
+        m_pop3ConData->next_state = POP3_SEND_TOP;
+    else
+        m_pop3ConData->next_state = POP3_SEND_RETR;
+    return 0;
+}
+
+/* retreive the whole message
+ */
+int32_t
+nsPop3Protocol::SendRetr()
+{
+
+  char * cmd = PR_smprintf("RETR %ld" CRLF, m_pop3ConData->msg_info[m_pop3ConData->last_accessed_msg].msgnum);
+  int32_t status = -1;
+  if (cmd)
+  {
+    m_pop3ConData->next_state_after_response = POP3_RETR_RESPONSE;
+    m_pop3ConData->cur_msg_size = -1;
+
+
+    /* zero the bytes received in message in preparation for
+    * the next
+    */
+    m_bytesInMsgReceived = 0;
+
+    if (m_pop3ConData->only_uidl)
+    {
+      /* Display bytes if we're only downloading one message. */
+      PR_ASSERT(!m_pop3ConData->graph_progress_bytes_p);
+      UpdateProgressPercent(0, m_totalDownloadSize);
+      m_pop3ConData->graph_progress_bytes_p = true;
+    }
+    else
+    {
+      nsString finalString;
+      mozilla::DebugOnly<nsresult> rv =
+        FormatCounterString(NS_LITERAL_STRING("receivingMessages"),
+                            m_pop3ConData->real_new_counter,
+                            m_pop3ConData->really_new_messages,
+                            finalString);
+      NS_ASSERTION(NS_SUCCEEDED(rv), "couldn't format string");
+      if (mProgressEventSink) {
+        rv = mProgressEventSink->OnStatus(this, m_channelContext, NS_OK,
+                                          finalString.get());
+        NS_ASSERTION(NS_SUCCEEDED(rv), "dropping error result");
+      }
+    }
+
+    status = Pop3SendData(cmd);
+  } // if cmd
+  PR_Free(cmd);
+  return status;
+}
+
+/* digest the message
+ */
+int32_t
+nsPop3Protocol::RetrResponse(nsIInputStream* inputStream,
+                             uint32_t length)
+{
+    uint32_t buffer_size;
+    int32_t flags = 0;
+    char *uidl = NULL;
+    nsresult rv;
+    uint32_t status = 0;
+
+    if(m_pop3ConData->cur_msg_size == -1)
+    {
+        /* this is the beginning of a message
+         * get the response code and byte size
+         */
+        if(!m_pop3ConData->command_succeeded)
+            return Error("pop3RetrFailure");
+
+        /* a successful RETR response looks like: #num_bytes Junk
+           from TOP we only get the +OK and data
+           */
+        if (m_pop3ConData->truncating_cur_msg)
+        { /* TOP, truncated message */
+            flags |= nsMsgMessageFlags::Partial;
+        }
+        else
+        {
+          nsCString cmdResp(m_commandResponse);
+          char *newStr = cmdResp.BeginWriting();
+          char *num = NS_strtok( " ", &newStr);
+          if (num)
+            m_pop3ConData->cur_msg_size = atol(num);
+          m_commandResponse = newStr;
+        }
+
+        /* RETR complete message */
+        if (!m_senderInfo.IsEmpty())
+            flags |= nsMsgMessageFlags::SenderAuthed;
+
+        if(m_pop3ConData->cur_msg_size <= 0)
+        {
+          if (m_pop3ConData->msg_info)
+            m_pop3ConData->cur_msg_size = m_pop3ConData->msg_info[m_pop3ConData->last_accessed_msg].size;
+          else
+            m_pop3ConData->cur_msg_size = 0;
+        }
+
+        if (m_pop3ConData->msg_info &&
+            m_pop3ConData->msg_info[m_pop3ConData->last_accessed_msg].uidl)
+            uidl = m_pop3ConData->msg_info[m_pop3ConData->last_accessed_msg].uidl;
+
+        m_pop3ConData->parsed_bytes = 0;
+        m_pop3ConData->pop3_size = m_pop3ConData->cur_msg_size;
+        m_pop3ConData->assumed_end = false;
+
+        m_pop3Server->GetDotFix(&m_pop3ConData->dot_fix);
+
+        MOZ_LOG(POP3LOGMODULE,LogLevel::Info,
+                (POP3LOG("Opening message stream: MSG_IncorporateBegin")));
+
+        /* open the message stream so we have someplace
+         * to put the data
+         */
+        m_pop3ConData->real_new_counter++;
+        /* (rb) count only real messages being downloaded */
+        rv = m_nsIPop3Sink->IncorporateBegin(uidl, m_url, flags,
+                                        &m_pop3ConData->msg_closure);
+
+        MOZ_LOG(POP3LOGMODULE, LogLevel::Info, (POP3LOG("Done opening message stream!")));
+
+        if(!m_pop3ConData->msg_closure || NS_FAILED(rv))
+            return Error("pop3MessageWriteError");
+    }
+
+    m_pop3ConData->pause_for_read = true;
+
+    bool pauseForMoreData = false;
+    char *line = m_lineStreamBuffer->ReadNextLine(inputStream, status, pauseForMoreData, &rv, true);
+    MOZ_LOG(POP3LOGMODULE, LogLevel::Info, (POP3LOG("RECV: %s"), line));
+    if (NS_FAILED(rv))
+      return -1;
+
+    buffer_size = status;
+
+    if (status == 0 && !line)  // no bytes read in...
+      return (0);
+
+    if (m_pop3ConData->msg_closure) /* not done yet */
+    {
+      // buffer the line we just read in, and buffer all remaining lines in the stream
+      status = buffer_size;
+      do
+      {
+        if (m_pop3ConData->msg_closure)
+        {
+          rv = HandleLine(line, buffer_size);
+          if (NS_FAILED(rv))
+            return Error("pop3MessageWriteError");
+
+          // buffer_size already includes MSG_LINEBREAK_LEN so
+          // subtract and add CRLF
+          // but not really sure we always had CRLF in input since
+          // we also treat a single LF as line ending!
+          m_pop3ConData->parsed_bytes += buffer_size - MSG_LINEBREAK_LEN + 2;
+        }
+
+        // now read in the next line
+        PR_Free(line);
+        line = m_lineStreamBuffer->ReadNextLine(inputStream, buffer_size,
+                                                pauseForMoreData, &rv, true);
+        if (NS_FAILED(rv))
+          return -1;
+
+        MOZ_LOG(POP3LOGMODULE, LogLevel::Info, (POP3LOG("RECV: %s"), line));
+        // buffer_size already includes MSG_LINEBREAK_LEN so
+        // subtract and add CRLF
+        // but not really sure we always had CRLF in input since
+        // we also treat a single LF as line ending!
+        status += buffer_size - MSG_LINEBREAK_LEN + 2;
+      } while (line);
+    }
+
+    buffer_size = status;  // status holds # bytes we've actually buffered so far...
+
+    /* normal read. Yay! */
+    if ((int32_t) (m_bytesInMsgReceived + buffer_size) > m_pop3ConData->cur_msg_size)
+        buffer_size = m_pop3ConData->cur_msg_size - m_bytesInMsgReceived;
+
+    m_bytesInMsgReceived += buffer_size;
+    m_totalBytesReceived += buffer_size;
+
+    // *** jefft in case of the message size that server tells us is different
+    // from the actual message size
+    if (pauseForMoreData && m_pop3ConData->dot_fix &&
+        m_pop3ConData->assumed_end && m_pop3ConData->msg_closure)
+    {
+        nsCOMPtr<nsIMsgMailNewsUrl> mailnewsUrl = do_QueryInterface(m_url, &rv);
+        nsCOMPtr<nsIMsgWindow> msgWindow;
+        if (NS_SUCCEEDED(rv))
+          rv = mailnewsUrl->GetMsgWindow(getter_AddRefs(msgWindow));
+        rv = m_nsIPop3Sink->IncorporateComplete(msgWindow,
+          m_pop3ConData->truncating_cur_msg ? m_pop3ConData->cur_msg_size : 0);
+
+        // The following was added to prevent the loss of Data when we try
+        // and write to somewhere we don't have write access error to (See
+        // bug 62480)
+        // (Note: This is only a temp hack until the underlying XPCOM is
+        // fixed to return errors)
+
+        if (NS_FAILED(rv))
+            return Error((rv == NS_MSG_ERROR_COPYING_FROM_TMP_DOWNLOAD) ?
+                         "pop3TmpDownloadError" :
+                         "pop3MessageWriteError");
+
+        m_pop3ConData->msg_closure = nullptr;
+    }
+
+    if (!m_pop3ConData->msg_closure)
+        /* meaning _handle_line read ".\r\n" at end-of-msg */
+    {
+        m_pop3ConData->pause_for_read = false;
+
+        if (m_pop3ConData->truncating_cur_msg ||
+            m_pop3ConData->leave_on_server )
+        {
+            Pop3UidlEntry *uidlEntry = NULL;
+            Pop3MsgInfo* info = m_pop3ConData->msg_info + m_pop3ConData->last_accessed_msg;
+
+            /* Check for filter actions - FETCH or DELETE */
+            if ((m_pop3ConData->newuidl) && (info->uidl))
+              uidlEntry = (Pop3UidlEntry *)PL_HashTableLookup(m_pop3ConData->newuidl, info->uidl);
+
+            if (uidlEntry && uidlEntry->status == FETCH_BODY &&
+                m_pop3ConData->truncating_cur_msg)
+            {
+            /* A filter decided to retrieve this full msg.
+               Use GetMsg() so the popstate will update correctly,
+               but don't let this msg get counted twice. */
+               m_pop3ConData->next_state = POP3_GET_MSG;
+               m_pop3ConData->real_new_counter--;
+            /* Make sure we don't try to come through here again. */
+               PL_HashTableRemove (m_pop3ConData->newuidl, (void*)info->uidl);
+               put_hash(m_pop3ConData->uidlinfo->hash, info->uidl, FETCH_BODY, uidlEntry->dateReceived);
+
+            } else if (uidlEntry && uidlEntry->status == DELETE_CHAR)
+            {
+            // A filter decided to delete this msg from the server
+               m_pop3ConData->next_state = POP3_SEND_DELE;
+            } else
+            {
+            /* We've retrieved all or part of this message, but we want to
+               keep it on the server.  Go on to the next message. */
+               m_pop3ConData->last_accessed_msg++;
+               m_pop3ConData->next_state = POP3_GET_MSG;
+            }
+            if (m_pop3ConData->only_uidl)
+            {
+            /* GetMsg didn't update this field. Do it now */
+              uidlEntry = (Pop3UidlEntry *)PL_HashTableLookup(m_pop3ConData->uidlinfo->hash, m_pop3ConData->only_uidl);
+              NS_ASSERTION(uidlEntry, "uidl not found in uidlinfo");
+              if (uidlEntry)
+                put_hash(m_pop3ConData->uidlinfo->hash, m_pop3ConData->only_uidl, KEEP, uidlEntry->dateReceived);
+            }
+        }
+        else
+        {
+           m_pop3ConData->next_state = POP3_SEND_DELE;
+        }
+
+        /* if we didn't get the whole message add the bytes that we didn't get
+           to the bytes received part so that the progress percent stays sane.
+           */
+        if (m_bytesInMsgReceived < m_pop3ConData->cur_msg_size)
+          m_totalBytesReceived += (m_pop3ConData->cur_msg_size -
+                                   m_bytesInMsgReceived);
+    }
+
+    /* set percent done to portion of total bytes of all messages
+       that we're going to download. */
+    if (m_totalDownloadSize)
+      UpdateProgressPercent(m_totalBytesReceived, m_totalDownloadSize);
+
+    PR_Free(line);
+    return(0);
+}
+
+
+int32_t
+nsPop3Protocol::TopResponse(nsIInputStream* inputStream, uint32_t length)
+{
+  if (TestCapFlag(POP3_TOP_UNDEFINED))
+  {
+    ClearCapFlag(POP3_TOP_UNDEFINED);
+    if (m_pop3ConData->command_succeeded)
+      SetCapFlag(POP3_HAS_TOP);
+    else
+      ClearCapFlag(POP3_HAS_TOP);
+    m_pop3Server->SetPop3CapabilityFlags(m_pop3ConData->capability_flags);
+  }
+
+  if(m_pop3ConData->cur_msg_size == -1 &&  /* first line after TOP command sent */
+    !m_pop3ConData->command_succeeded)  /* and TOP command failed */
+  {
+  /* TOP doesn't work so we can't retrieve the first part of this msg.
+  So just go download the whole thing, and warn the user.
+
+    Note that the progress bar will not be accurate in this case.
+    Oops. #### */
+    m_pop3ConData->truncating_cur_msg = false;
+
+    nsString statusTemplate;
+    mLocalBundle->GetStringFromName(
+      u"pop3ServerDoesNotSupportTopCommand",
+      getter_Copies(statusTemplate));
+    if (!statusTemplate.IsEmpty())
+    {
+      nsAutoCString hostName;
+      char16_t * statusString = nullptr;
+      m_url->GetHost(hostName);
+
+      statusString = nsTextFormatter::smprintf(statusTemplate.get(), hostName.get());
+      UpdateStatusWithString(statusString);
+      nsTextFormatter::smprintf_free(statusString);
+    }
+
+    if (m_prefAuthMethods != POP3_HAS_AUTH_USER &&
+        TestCapFlag(POP3_HAS_XSENDER))
+      m_pop3ConData->next_state = POP3_SEND_XSENDER;
+    else
+      m_pop3ConData->next_state = POP3_SEND_RETR;
+    return(0);
+  }
+
+  /* If TOP works, we handle it in the same way as RETR. */
+  return RetrResponse(inputStream, length);
+}
+
+/* line is handed over as null-terminated string with MSG_LINEBREAK */
+nsresult
+nsPop3Protocol::HandleLine(char *line, uint32_t line_length)
+{
+    nsresult rv = NS_OK;
+
+    NS_ASSERTION(m_pop3ConData->msg_closure, "m_pop3ConData->msg_closure is null in nsPop3Protocol::HandleLine()");
+    if (!m_pop3ConData->msg_closure)
+        return NS_ERROR_NULL_POINTER;
+
+    if (!m_senderInfo.IsEmpty() && !m_pop3ConData->seenFromHeader)
+    {
+        if (line_length > 6 && !PL_strncasecmp("From: ", line, 6))
+        {
+            m_pop3ConData->seenFromHeader = true;
+            if (PL_strstr(line, m_senderInfo.get()) == NULL)
+                m_nsIPop3Sink->SetSenderAuthedFlag(m_pop3ConData->msg_closure,
+                                                     false);
+        }
+    }
+
+    // line contains only a single dot and linebreak -> message end
+    if (line_length == 1 + MSG_LINEBREAK_LEN && line[0] == '.')
+    {
+        m_pop3ConData->assumed_end = true;  /* in case byte count from server is */
+                                    /* wrong, mark we may have had the end */
+        if (!m_pop3ConData->dot_fix || m_pop3ConData->truncating_cur_msg ||
+            (m_pop3ConData->parsed_bytes >= (m_pop3ConData->pop3_size -3)))
+        {
+            nsCOMPtr<nsIMsgMailNewsUrl> mailnewsUrl = do_QueryInterface(m_url, &rv);
+            nsCOMPtr<nsIMsgWindow> msgWindow;
+            if (NS_SUCCEEDED(rv))
+              rv = mailnewsUrl->GetMsgWindow(getter_AddRefs(msgWindow));
+            rv = m_nsIPop3Sink->IncorporateComplete(msgWindow,
+              m_pop3ConData->truncating_cur_msg ? m_pop3ConData->cur_msg_size : 0);
+
+            // The following was added to prevent the loss of Data when we try
+            // and write to somewhere we don't have write access error to (See
+            // bug 62480)
+            // (Note: This is only a temp hack until the underlying XPCOM is
+            // fixed to return errors)
+
+            if (NS_FAILED(rv)) {
+              Error((rv == NS_MSG_ERROR_COPYING_FROM_TMP_DOWNLOAD) ?
+                    "pop3TmpDownloadError" :
+                    "pop3MessageWriteError");
+              return rv;
+            }
+
+            m_pop3ConData->msg_closure = nullptr;
+            return rv;
+        }
+    }
+    /* Check if the line begins with the termination octet. If so
+       and if another termination octet follows, we step over the
+       first occurence of it. */
+    else if (line_length > 1 && line[0] == '.' && line[1] == '.') {
+        line++;
+        line_length--;
+
+    }
+
+    return m_nsIPop3Sink->IncorporateWrite(line, line_length);
+}
+
+int32_t nsPop3Protocol::SendDele()
+{
+    /* increment the last accessed message since we have now read it
+     */
+    char * cmd = PR_smprintf("DELE %ld" CRLF, m_pop3ConData->msg_info[m_pop3ConData->last_accessed_msg].msgnum);
+    m_pop3ConData->last_accessed_msg++;
+    int32_t status = -1;
+    if (cmd)
+    {
+      m_pop3ConData->next_state_after_response = POP3_DELE_RESPONSE;
+      status = Pop3SendData(cmd);
+    }
+    PR_Free(cmd);
+    return status;
+}
+
+int32_t nsPop3Protocol::DeleResponse()
+{
+  Pop3UidlHost *host = NULL;
+
+  host = m_pop3ConData->uidlinfo;
+
+  /* the return from the delete will come here
+  */
+  if(!m_pop3ConData->command_succeeded)
+    return Error("pop3DeleFailure");
+
+
+  /*  ###chrisf
+  the delete succeeded.  Write out state so that we
+  keep track of all the deletes which have not yet been
+  committed on the server.  Flush this state upon successful
+  QUIT.
+
+  We will do this by adding each successfully deleted message id
+  to a list which we will write out to popstate.dat in
+  net_pop3_write_state().
+  */
+  if (host)
+  {
+    if (m_pop3ConData->msg_info &&
+      m_pop3ConData->msg_info[m_pop3ConData->last_accessed_msg-1].uidl)
+    {
+      if (m_pop3ConData->newuidl)
+        if (m_pop3ConData->leave_on_server)
+        {
+          PL_HashTableRemove(m_pop3ConData->newuidl, (void*)
+            m_pop3ConData->msg_info[m_pop3ConData->last_accessed_msg-1].uidl);
+        }
+        else
+        {
+          put_hash(m_pop3ConData->newuidl,
+            m_pop3ConData->msg_info[m_pop3ConData->last_accessed_msg-1].uidl, DELETE_CHAR, 0);
+          /* kill message in new hash table */
+        }
+      else
+        PL_HashTableRemove(host->hash,
+            (void*) m_pop3ConData->msg_info[m_pop3ConData->last_accessed_msg-1].uidl);
+    }
+  }
+
+  m_pop3ConData->next_state = POP3_GET_MSG;
+  m_pop3ConData->pause_for_read = false;
+
+  return(0);
+}
+
+
+int32_t
+nsPop3Protocol::CommitState(bool remove_last_entry)
+{
+  // only use newuidl if we successfully finished looping through all the
+  // messages in the inbox.
+  if (m_pop3ConData->newuidl)
+  {
+    if (m_pop3ConData->last_accessed_msg >= m_pop3ConData->number_of_messages)
+    {
+      PL_HashTableDestroy(m_pop3ConData->uidlinfo->hash);
+      m_pop3ConData->uidlinfo->hash = m_pop3ConData->newuidl;
+      m_pop3ConData->newuidl = nullptr;
+    }
+    else
+    {
+      /* If we are leaving messages on the server, pull out the last
+        uidl from the hash, because it might have been put in there before
+        we got it into the database.
+      */
+      if (remove_last_entry && m_pop3ConData->msg_info &&
+          !m_pop3ConData->only_uidl && m_pop3ConData->newuidl->nentries > 0)
+      {
+        Pop3MsgInfo* info = m_pop3ConData->msg_info + m_pop3ConData->last_accessed_msg;
+        if (info && info->uidl)
+        {
+          mozilla::DebugOnly<bool> val = PL_HashTableRemove(m_pop3ConData->newuidl,
+                                                            info->uidl);
+          NS_ASSERTION(val, "uidl not in hash table");
+        }
+      }
+
+      // Add the entries in newuidl to m_pop3ConData->uidlinfo->hash to keep
+      // track of the messages we *did* download in this session.
+      PL_HashTableEnumerateEntries(m_pop3ConData->newuidl, net_pop3_copy_hash_entries, (void *)m_pop3ConData->uidlinfo->hash);
+    }
+  }
+
+  if (!m_pop3ConData->only_check_for_new_mail)
+  {
+    nsresult rv;
+    nsCOMPtr<nsIFile> mailDirectory;
+
+    // get the mail directory
+    nsCOMPtr<nsIMsgIncomingServer> server =
+      do_QueryInterface(m_pop3Server, &rv);
+    if (NS_FAILED(rv)) return -1;
+
+    rv = server->GetLocalPath(getter_AddRefs(mailDirectory));
+    if (NS_FAILED(rv)) return -1;
+
+    // write the state in the mail directory
+    net_pop3_write_state(m_pop3ConData->uidlinfo, mailDirectory.get());
+  }
+  return 0;
+}
+
+
+/* NET_process_Pop3  will control the state machine that
+ * loads messages from a pop3 server
+ *
+ * returns negative if the transfer is finished or error'd out
+ *
+ * returns zero or more if the transfer needs to be continued.
+ */
+nsresult nsPop3Protocol::ProcessProtocolState(nsIURI * url, nsIInputStream * aInputStream,
+                                              uint64_t sourceOffset, uint32_t aLength)
+{
+  int32_t status = 0;
+  bool urlStatusSet = false;
+  nsCOMPtr<nsIMsgMailNewsUrl> mailnewsurl = do_QueryInterface(m_url);
+
+  MOZ_LOG(POP3LOGMODULE, LogLevel::Info, (POP3LOG("Entering NET_ProcessPop3 %d"),
+                                          aLength));
+
+  m_pop3ConData->pause_for_read = false; /* already paused; reset */
+
+  if(m_username.IsEmpty())
+  {
+    // net_pop3_block = false;
+    Error("pop3UsernameUndefined");
+    return NS_MSG_SERVER_USERNAME_MISSING;
+  }
+
+  while(!m_pop3ConData->pause_for_read)
+  {
+    MOZ_LOG(POP3LOGMODULE, LogLevel::Info,
+            (POP3LOG("Entering state: %d"), m_pop3ConData->next_state));
+
+    switch(m_pop3ConData->next_state)
+    {
+    case POP3_READ_PASSWORD:
+      // This is a separate state so that we're waiting for the user to type
+      // in a password while we don't actually have a connection to the pop
+      // server open; this saves us from having to worry about the server
+      // timing out on us while we wait for user input.
+      if (NS_FAILED(StartGetAsyncPassword(POP3_OBTAIN_PASSWORD_EARLY)))
+        status = -1;
+      break;
+    case POP3_FINISH_OBTAIN_PASSWORD_EARLY:
+      {
+        if (m_passwordResult.IsEmpty() || m_username.IsEmpty())
+        {
+          status = MK_POP3_PASSWORD_UNDEFINED;
+          m_pop3ConData->biffstate = nsIMsgFolder::nsMsgBiffState_Unknown;
+          m_nsIPop3Sink->SetBiffStateAndUpdateFE(m_pop3ConData->biffstate, 0, false);
+
+          /* update old style biff */
+          m_pop3ConData->next_state = POP3_FREE;
+          m_pop3ConData->pause_for_read = false;
+          break;
+        }
+
+        m_pop3ConData->pause_for_read = false;
+        // we are already connected so just go on and send the username
+        if (m_prefAuthMethods == POP3_HAS_AUTH_USER)
+        {
+          m_currentAuthMethod = POP3_HAS_AUTH_USER;
+          m_pop3ConData->next_state = POP3_SEND_USERNAME;
+        }
+        else
+        {
+          if (TestCapFlag(POP3_AUTH_MECH_UNDEFINED))
+            m_pop3ConData->next_state = POP3_SEND_AUTH;
+          else
+            m_pop3ConData->next_state = POP3_SEND_CAPA;
+        }
+        break;
+      }
+
+
+    case POP3_START_CONNECT:
+      {
+        m_pop3ConData->next_state = POP3_FINISH_CONNECT;
+        m_pop3ConData->pause_for_read = false;
+        break;
+      }
+
+    case POP3_FINISH_CONNECT:
+      {
+        m_pop3ConData->pause_for_read = false;
+        m_pop3ConData->next_state = POP3_WAIT_FOR_START_OF_CONNECTION_RESPONSE;
+        break;
+      }
+
+    case POP3_WAIT_FOR_RESPONSE:
+      status = WaitForResponse(aInputStream, aLength);
+      break;
+
+    case POP3_WAIT_FOR_START_OF_CONNECTION_RESPONSE:
+      {
+        status = WaitForStartOfConnectionResponse(aInputStream, aLength);
+
+        if(status)
+        {
+          if (m_prefAuthMethods == POP3_HAS_AUTH_USER)
+          {
+            m_currentAuthMethod = POP3_HAS_AUTH_USER;
+            m_pop3ConData->next_state = POP3_SEND_USERNAME;
+          }
+          else
+          {
+            if (TestCapFlag(POP3_AUTH_MECH_UNDEFINED))
+              m_pop3ConData->next_state = POP3_SEND_AUTH;
+            else
+              m_pop3ConData->next_state = POP3_SEND_CAPA;
+          }
+        }
+
+        break;
+      }
+
+    case POP3_SEND_AUTH:
+      status = SendAuth();
+      break;
+
+    case POP3_AUTH_RESPONSE:
+      status = AuthResponse(aInputStream, aLength);
+      break;
+
+   case POP3_SEND_CAPA:
+      status = SendCapa();
+      break;
+
+    case POP3_CAPA_RESPONSE:
+      status = CapaResponse(aInputStream, aLength);
+      break;
+
+    case POP3_TLS_RESPONSE:
+      status = SendTLSResponse();
+      break;
+
+    case POP3_PROCESS_AUTH:
+      status = ProcessAuth();
+      break;
+
+    case POP3_NEXT_AUTH_STEP:
+      status = NextAuthStep();
+      break;
+
+    case POP3_AUTH_LOGIN:
+      status = AuthLogin();
+      break;
+
+    case POP3_AUTH_LOGIN_RESPONSE:
+      status = AuthLoginResponse();
+      break;
+
+    case POP3_AUTH_NTLM:
+      status = AuthNtlm();
+      break;
+
+    case POP3_AUTH_NTLM_RESPONSE:
+      status = AuthNtlmResponse();
+      break;
+
+    case POP3_AUTH_GSSAPI:
+      status = AuthGSSAPI();
+      break;
+
+    case POP3_AUTH_GSSAPI_FIRST:
+      UpdateStatus(u"hostContact");
+      status = AuthGSSAPIResponse(true);
+      break;
+
+    case POP3_AUTH_GSSAPI_STEP:
+      status = AuthGSSAPIResponse(false);
+      break;
+
+    case POP3_SEND_USERNAME:
+      if (NS_FAILED(StartGetAsyncPassword(POP3_OBTAIN_PASSWORD_BEFORE_USERNAME)))
+        status = -1;
+      break;
+
+    case POP3_OBTAIN_PASSWORD_BEFORE_USERNAME:
+      status = -1;
+      break;
+
+    case POP3_FINISH_OBTAIN_PASSWORD_BEFORE_USERNAME:
+      UpdateStatus(u"hostContact");
+      status = SendUsername();
+      break;
+
+    case POP3_SEND_PASSWORD:
+      if (NS_FAILED(StartGetAsyncPassword(POP3_OBTAIN_PASSWORD_BEFORE_PASSWORD)))
+        status = -1;
+      break;
+
+    case POP3_FINISH_OBTAIN_PASSWORD_BEFORE_PASSWORD:
+      status = SendPassword();
+      break;
+
+    case POP3_SEND_GURL:
+      status = SendGurl();
+      break;
+
+    case POP3_GURL_RESPONSE:
+      status = GurlResponse();
+      break;
+
+    case POP3_SEND_STAT:
+      status = SendStat();
+      break;
+
+    case POP3_GET_STAT:
+      status = GetStat();
+      break;
+
+    case POP3_SEND_LIST:
+      status = SendList();
+      break;
+
+    case POP3_GET_LIST:
+      status = GetList(aInputStream, aLength);
+      break;
+
+    case POP3_SEND_UIDL_LIST:
+      status = SendUidlList();
+      break;
+
+    case POP3_GET_UIDL_LIST:
+      status = GetUidlList(aInputStream, aLength);
+      break;
+
+    case POP3_SEND_XTND_XLST_MSGID:
+      status = SendXtndXlstMsgid();
+      break;
+
+    case POP3_GET_XTND_XLST_MSGID:
+      status = GetXtndXlstMsgid(aInputStream, aLength);
+      break;
+
+    case POP3_GET_MSG:
+      status = GetMsg();
+      break;
+
+    case POP3_SEND_TOP:
+      status = SendTop();
+      break;
+
+    case POP3_TOP_RESPONSE:
+      status = TopResponse(aInputStream, aLength);
+      break;
+
+    case POP3_SEND_XSENDER:
+      status = SendXsender();
+      break;
+
+    case POP3_XSENDER_RESPONSE:
+      status = XsenderResponse();
+      break;
+
+    case POP3_SEND_RETR:
+      status = SendRetr();
+      break;
+
+    case POP3_RETR_RESPONSE:
+      status = RetrResponse(aInputStream, aLength);
+      break;
+
+    case POP3_SEND_DELE:
+      status = SendDele();
+      break;
+
+    case POP3_DELE_RESPONSE:
+      status = DeleResponse();
+      break;
+
+    case POP3_SEND_QUIT:
+    /* attempt to send a server quit command.  Since this means
+    everything went well, this is a good time to update the
+    status file and the FE's biff state.
+      */
+      if (!m_pop3ConData->only_uidl)
+      {
+        /* update old style biff */
+        if (!m_pop3ConData->only_check_for_new_mail)
+        {
+        /* We don't want to pop up a warning message any more (see
+        bug 54116), so instead we put the "no new messages" or
+        "retrieved x new messages"
+        in the status line.  Unfortunately, this tends to be running
+        in a progress pane, so we try to get the real pane and
+          show the message there. */
+
+          if (m_totalDownloadSize <= 0)
+          {
+            UpdateStatus(u"noNewMessages");
+            /* There are no new messages.  */
+          }
+          else
+          {
+            nsString statusString;
+            nsresult rv = FormatCounterString(NS_LITERAL_STRING("receivedMsgs"),
+                                              m_pop3ConData->real_new_counter - 1,
+                                              m_pop3ConData->really_new_messages,
+                                              statusString);
+            if (NS_SUCCEEDED(rv))
+              UpdateStatusWithString(statusString.get());
+          }
+        }
+      }
+
+      status = Pop3SendData("QUIT" CRLF);
+      m_pop3ConData->next_state = POP3_WAIT_FOR_RESPONSE;
+      m_pop3ConData->next_state_after_response = POP3_QUIT_RESPONSE;
+      break;
+
+    case POP3_QUIT_RESPONSE:
+      if(m_pop3ConData->command_succeeded)
+      {
+      /*  the QUIT succeeded.  We can now flush the state in popstate.dat which
+        keeps track of any uncommitted DELE's */
+
+        /* clear the hash of all our uncommitted deletes */
+        if (!m_pop3ConData->leave_on_server && m_pop3ConData->newuidl)
+        {
+          PL_HashTableEnumerateEntries(m_pop3ConData->newuidl,
+                                        net_pop3_remove_messages_marked_delete,
+                                       (void *)m_pop3ConData);
+        }
+        m_pop3ConData->next_state = POP3_DONE;
+      }
+      else
+      {
+        m_pop3ConData->next_state = POP3_ERROR_DONE;
+      }
+      break;
+
+    case POP3_DONE:
+      CommitState(false);
+      m_pop3ConData->urlStatus = NS_OK;
+      urlStatusSet = true;
+      m_pop3ConData->next_state = POP3_FREE;
+      break;
+
+    case POP3_ERROR_DONE:
+      /*  write out the state */
+      if(m_pop3ConData->list_done)
+        CommitState(true);
+
+      if(m_pop3ConData->msg_closure)
+      {
+        m_nsIPop3Sink->IncorporateAbort(m_pop3ConData->only_uidl != nullptr);
+        m_pop3ConData->msg_closure = NULL;
+        m_nsIPop3Sink->AbortMailDelivery(this);
+      }
+
+      if(m_pop3ConData->msg_del_started)
+      {
+        nsString statusString;
+        nsresult rv = FormatCounterString(NS_LITERAL_STRING("receivedMsgs"),
+                                 m_pop3ConData->real_new_counter - 1,
+                                 m_pop3ConData->really_new_messages,
+                                 statusString);
+        if (NS_SUCCEEDED(rv))
+          UpdateStatusWithString(statusString.get());
+
+        NS_ASSERTION (!TestFlag(POP3_PASSWORD_FAILED), "POP3_PASSWORD_FAILED set when del_started");
+        m_nsIPop3Sink->AbortMailDelivery(this);
+      }
+      { // this brace is to avoid compiler error about vars in switch case.
+        nsCOMPtr<nsIMsgWindow> msgWindow;
+
+        if (mailnewsurl)
+          mailnewsurl->GetMsgWindow(getter_AddRefs(msgWindow));
+        // no msgWindow means no re-prompt, so treat as error.
+        if (TestFlag(POP3_PASSWORD_FAILED) && msgWindow)
+        {
+          // We get here because the password was wrong.
+          if (!m_socketIsOpen && mailnewsurl)
+          {
+            // The server dropped the connection, so we're going
+            // to re-run the url.
+            MOZ_LOG(POP3LOGMODULE, LogLevel::Debug,
+                    (POP3LOG("need to rerun url because connection dropped during auth")));
+            m_needToRerunUrl = true;
+            return NS_OK;
+          }
+          m_pop3ConData->next_state = POP3_READ_PASSWORD;
+          m_pop3ConData->command_succeeded = true;
+          status = 0;
+          break;
+        }
+        else
+          /* Else we got a "real" error, so finish up. */
+          m_pop3ConData->next_state = POP3_FREE;
+      }
+      m_pop3ConData->urlStatus = NS_ERROR_FAILURE;
+      urlStatusSet = true;
+      m_pop3ConData->pause_for_read = false;
+      break;
+
+    case POP3_FREE:
+      {
+        UpdateProgressPercent(0,0); // clear out the progress meter
+        nsCOMPtr<nsIMsgIncomingServer> server = do_QueryInterface(m_pop3Server);
+        if (server)
+        {
+          MOZ_LOG(POP3LOGMODULE, LogLevel::Debug, (POP3LOG("Clearing server busy in POP3_FREE")));
+          server->SetServerBusy(false); // the server is now not busy
+        }
+        MOZ_LOG(POP3LOGMODULE, LogLevel::Debug, (POP3LOG("Clearing running protocol in POP3_FREE")));
+        CloseSocket();
+        m_pop3Server->SetRunningProtocol(nullptr);
+        if (mailnewsurl && urlStatusSet)
+          mailnewsurl->SetUrlState(false, m_pop3ConData->urlStatus);
+
+        m_url = nullptr;
+        return NS_OK;
+      }
+    default:
+      NS_ERROR("Got to unexpected state in nsPop3Protocol::ProcessProtocolState");
+      status = -1;
+    }  /* end switch */
+
+    if((status < 0) && m_pop3ConData->next_state != POP3_FREE)
+    {
+      m_pop3ConData->pause_for_read = false;
+      m_pop3ConData->next_state = POP3_ERROR_DONE;
+    }
+
+  }  /* end while */
+
+  return NS_OK;
+
+}
+
+NS_IMETHODIMP nsPop3Protocol::MarkMessages(nsTArray<Pop3UidlEntry*> *aUIDLArray)
+{
+  NS_ENSURE_ARG_POINTER(aUIDLArray);
+  uint32_t count = aUIDLArray->Length();
+
+  for (uint32_t i = 0; i < count; i++)
+  {
+    bool changed;
+    if (m_pop3ConData->newuidl)
+      MarkMsgInHashTable(m_pop3ConData->newuidl, aUIDLArray->ElementAt(i), &changed);
+    if (m_pop3ConData->uidlinfo)
+      MarkMsgInHashTable(m_pop3ConData->uidlinfo->hash, aUIDLArray->ElementAt(i), &changed);
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsPop3Protocol::CheckMessage(const char *aUidl, bool *aBool)
+{
+  Pop3UidlEntry *uidlEntry = nullptr;
+
+  if (aUidl)
+  {
+    if (m_pop3ConData->newuidl)
+      uidlEntry = (Pop3UidlEntry *) PL_HashTableLookup(m_pop3ConData->newuidl, aUidl);
+    else if (m_pop3ConData->uidlinfo)
+      uidlEntry = (Pop3UidlEntry *) PL_HashTableLookup(m_pop3ConData->uidlinfo->hash, aUidl);
+  }
+
+  *aBool = uidlEntry ? true : false;
+  return NS_OK;
+}
+
+
+/* Function for finding an APOP Timestamp and simple check
+   it for its validity. If returning NS_OK m_ApopTimestamp
+   contains the validated substring of m_commandResponse. */
+nsresult nsPop3Protocol::GetApopTimestamp()
+{
+  int32_t startMark = m_commandResponse.Length(), endMark = -1;
+
+  while (true)
+  {
+    // search for previous <
+    if ((startMark = MsgRFindChar(m_commandResponse, '<', startMark - 1)) < 0)
+      return NS_ERROR_FAILURE;
+
+    // search for next >
+    if ((endMark = m_commandResponse.FindChar('>', startMark)) < 0)
+      continue;
+
+    // look for an @ between start and end as a raw test
+    int32_t at = m_commandResponse.FindChar('@', startMark);
+    if (at < 0 || at >= endMark)
+      continue;
+
+    // now test if sub only consists of chars in ASCII range
+    nsCString sub(Substring(m_commandResponse, startMark, endMark - startMark + 1));
+    if (NS_IsAscii(sub.get()))
+    {
+      // set m_ApopTimestamp to the validated substring
+      m_ApopTimestamp.Assign(sub);
+      break;
+    }
+  }
+
+  return NS_OK;
+}
diff --git a/mailnews/local/src/nsPop3Protocol.h b/mailnews/local/src/nsPop3Protocol.h
new file mode 100644
index 000000000..a937427d1
--- /dev/null
+++ b/mailnews/local/src/nsPop3Protocol.h
@@ -0,0 +1,402 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsPop3Protocol_h__
+#define nsPop3Protocol_h__
+
+#include "mozilla/Attributes.h"
+#include "nsIStreamListener.h"
+#include "nsIOutputStream.h"
+#include "nsIInputStream.h"
+#include "nsIPop3URL.h"
+#include "nsIPop3Sink.h"
+#include "nsMsgLineBuffer.h"
+#include "nsMsgProtocol.h"
+#include "nsIPop3Protocol.h"
+#include "MailNewsTypes.h"
+#include "nsIStringBundle.h"
+#include "nsIMsgStatusFeedback.h"
+#include "nsIMsgFolder.h" // TO include biffState enum. Change to bool later...
+#include "nsIAuthModule.h"
+#include "nsITimer.h"
+#include "nsIMsgAsyncPrompter.h"
+
+#include "prerror.h"
+#include "plhash.h"
+#include "nsCOMPtr.h"
+
+/* A more guaranteed way of making sure that we never get duplicate messages
+is to always get each message's UIDL (if the server supports it)
+and use these for storing up deletes which were not committed on the
+server.  Based on our experience, it looks like we do NOT need to
+do this (it has performance tradeoffs, etc.).  To turn it on, three
+things need to happen: #define POP_ALWAYS_USE_UIDL_FOR_DUPLICATES, verify that
+the uidl's are correctly getting added when the delete response is received,
+and change the POP3_QUIT_RESPONSE state to flush the newly committed deletes. */
+
+/*
+ * Cannot have the following line uncommented. It is defined.
+ * #ifdef POP_ALWAYS_USE_UIDL_FOR_DUPLICATES will always be evaluated
+ * as true.
+ *
+#define POP_ALWAYS_USE_UIDL_FOR_DUPLICATES 0
+ *
+ */
+
+#define MK_OUT_OF_MEMORY -207
+#define MK_POP3_PASSWORD_UNDEFINED -313
+#define XP_NO_ANSWER 14401
+#define XP_THE_PREVIOUSLY_ENTERED_PASSWORD_IS_INVALID_ETC 14405
+#define XP_PASSWORD_FOR_POP3_USER 14590
+
+#define OUTPUT_BUFFER_SIZE 8192 // maximum size of command string
+
+/* structure to hold data pertaining to the active state of
+ * a transfer in progress.
+ *
+ */
+
+enum Pop3CapabilityEnum {
+    POP3_CAPABILITY_UNDEFINED   = 0x00000000,
+    POP3_HAS_XSENDER            = 0x00000001,
+    POP3_GURL_UNDEFINED         = 0x00000002,
+    POP3_HAS_GURL               = 0x00000004,
+    POP3_UIDL_UNDEFINED         = 0x00000008,
+    POP3_HAS_UIDL               = 0x00000010,
+    POP3_XTND_XLST_UNDEFINED    = 0x00000020,
+    POP3_HAS_XTND_XLST          = 0x00000040,
+    POP3_TOP_UNDEFINED          = 0x00000080,
+    POP3_HAS_TOP                = 0x00000100,
+    POP3_AUTH_MECH_UNDEFINED    = 0x00000200,
+    POP3_HAS_AUTH_USER          = 0x00000400,
+    POP3_HAS_AUTH_LOGIN         = 0x00000800,
+    POP3_HAS_AUTH_PLAIN         = 0x00001000,
+    POP3_HAS_AUTH_CRAM_MD5      = 0x00002000,
+    POP3_HAS_AUTH_APOP          = 0x00004000,
+    POP3_HAS_AUTH_NTLM          = 0x00008000,
+    POP3_HAS_AUTH_MSN           = 0x00010000,
+    POP3_HAS_RESP_CODES         = 0x00020000,
+    POP3_HAS_AUTH_RESP_CODE     = 0x00040000,
+    POP3_HAS_STLS               = 0x00080000,
+    POP3_HAS_AUTH_GSSAPI        = 0x00100000
+};
+
+// TODO use value > 0?
+#define POP3_HAS_AUTH_NONE        0
+#define POP3_HAS_AUTH_ANY         0x00001C00
+#define POP3_HAS_AUTH_ANY_SEC     0x0011E000
+
+enum Pop3StatesEnum {
+    POP3_READ_PASSWORD,                         // 0
+                                                //
+    POP3_START_CONNECT,                         // 1
+    POP3_FINISH_CONNECT,                        // 2
+    POP3_WAIT_FOR_RESPONSE,                     // 3
+    POP3_WAIT_FOR_START_OF_CONNECTION_RESPONSE, // 4
+    POP3_SEND_USERNAME,                         // 5
+
+    POP3_SEND_PASSWORD,                         // 6
+    POP3_SEND_STAT,                             // 7
+    POP3_GET_STAT,                              // 8
+    POP3_SEND_LIST,                             // 9
+    POP3_GET_LIST,                              // 10
+
+    POP3_SEND_UIDL_LIST,                        // 11
+    POP3_GET_UIDL_LIST,                         // 12
+    POP3_SEND_XTND_XLST_MSGID,                  // 13
+    POP3_GET_XTND_XLST_MSGID,                   // 14
+    POP3_GET_MSG,                               // 15
+
+    POP3_SEND_TOP,                              // 16
+    POP3_TOP_RESPONSE,                          // 17
+    POP3_SEND_RETR,                             // 18
+    POP3_RETR_RESPONSE,                         // 19
+    POP3_SEND_DELE,                             // 20
+
+    POP3_DELE_RESPONSE,                         // 21
+    POP3_SEND_QUIT,                             // 22
+    POP3_DONE,                                  // 23
+    POP3_ERROR_DONE,                            // 24
+    POP3_FREE,                                  // 25
+    POP3_SEND_AUTH,                             // 26
+    POP3_AUTH_RESPONSE,                         // 27
+    POP3_SEND_CAPA,                             // 28
+    POP3_CAPA_RESPONSE,                         // 29
+    POP3_PROCESS_AUTH,                          // 30
+    POP3_NEXT_AUTH_STEP,                        // 31
+
+    POP3_AUTH_LOGIN,                            // 32
+    POP3_AUTH_LOGIN_RESPONSE,                   // 33
+    POP3_AUTH_NTLM,                             // 34
+    POP3_AUTH_NTLM_RESPONSE,                    // 35
+    POP3_SEND_XSENDER,                          // 36
+    POP3_XSENDER_RESPONSE,                      // 37
+    POP3_SEND_GURL,                             // 38
+
+    POP3_GURL_RESPONSE,                         // 39
+    POP3_QUIT_RESPONSE,                         // 40
+    POP3_TLS_RESPONSE,                          // 41
+
+    POP3_AUTH_GSSAPI,                           // 42
+    POP3_AUTH_GSSAPI_FIRST,                     // 43
+    POP3_AUTH_GSSAPI_STEP,                      // 44
+
+    /**
+     * Async wait to obtain the password and deal with the result.
+     * The *PREOBTAIN* states are used for where we try and get the password
+     * before we've initiated a connection to the server.
+     */
+    POP3_OBTAIN_PASSWORD_EARLY,                 // 45
+    POP3_FINISH_OBTAIN_PASSWORD_EARLY,          // 46
+    POP3_OBTAIN_PASSWORD_BEFORE_USERNAME,       // 47
+    POP3_FINISH_OBTAIN_PASSWORD_BEFORE_USERNAME,// 48
+    POP3_OBTAIN_PASSWORD_BEFORE_PASSWORD,       // 49
+    POP3_FINISH_OBTAIN_PASSWORD_BEFORE_PASSWORD // 50
+};
+
+
+#define KEEP        'k'         /* If we want to keep this item on server. */
+#define DELETE_CHAR 'd'         /* If we want to delete this item. */
+#define TOO_BIG     'b'         /* item left on server because it was too big */
+#define FETCH_BODY  'f'         /* Fetch full body of a partial msg */
+
+typedef struct Pop3UidlEntry { /* information about this message */
+    char* uidl;
+    char  status; // KEEP=='k', DELETE='d' TOO_BIG='b' FETCH_BODY='f'
+    uint32_t dateReceived; // time message received, used for aging
+} Pop3UidlEntry;
+
+typedef struct Pop3UidlHost {
+    char* host;
+    char* user;
+    PLHashTable * hash;
+    Pop3UidlEntry* uidlEntries;
+    struct Pop3UidlHost* next;
+} Pop3UidlHost;
+
+typedef struct Pop3MsgInfo {
+    int32_t msgnum;
+    int32_t size;
+    char* uidl;
+} Pop3MsgInfo;
+
+typedef struct _Pop3ConData {
+    bool leave_on_server;     /* Whether we're supposed to leave messages
+                                   on server. */
+    bool headers_only;        /* Whether to just fetch headers on initial
+                                   downloads. */
+    int32_t size_limit;         /* Leave messages bigger than this on the
+                                   server and only download a partial
+                                   message. */
+    uint32_t capability_flags; /* What capability this server has? */
+
+    Pop3StatesEnum next_state;  /* the next state or action to be taken */
+    Pop3StatesEnum next_state_after_response;
+    bool pause_for_read;       /* Pause now for next read? */
+
+    bool command_succeeded;   /* did the last command succeed? */
+    bool list_done;    /* did we get the complete list of msgIDs? */
+    int32_t first_msg;
+
+    uint32_t obuffer_size;
+    uint32_t obuffer_fp;
+
+    int32_t  really_new_messages;
+    int32_t  real_new_counter;
+    int32_t number_of_messages;
+    Pop3MsgInfo  *msg_info;      /* Message sizes and uidls (used only if we
+                                   are playing games that involve leaving
+                                   messages on the server). */
+    int32_t last_accessed_msg;
+    int32_t cur_msg_size;
+    bool truncating_cur_msg;  /* are we using top and uidl? */
+    bool msg_del_started;     /* True if MSG_BeginMailDel...
+                                 * called
+                                 */
+    bool only_check_for_new_mail;
+    nsMsgBiffState biffstate;     /* If just checking for, what the answer is. */
+
+    bool verify_logon;        /* true if we're just seeing if we can logon */
+
+    void *msg_closure;
+
+    bool graph_progress_bytes_p; /* whether we should display info about
+                                      the bytes transferred (usually we
+                                      display info about the number of
+                                      messages instead.) */
+
+    Pop3UidlHost *uidlinfo;
+    PLHashTable *newuidl;
+    char *only_uidl;              /* If non-NULL, then load only this UIDL. */
+
+    bool get_url;
+    bool seenFromHeader;
+    int32_t parsed_bytes;
+    int32_t pop3_size;
+    bool dot_fix;
+    bool assumed_end;
+    nsresult urlStatus;
+} Pop3ConData;
+
+// State Flags (Note, I use the word state in terms of storing
+// state information about the connection (authentication, have we sent
+// commands, etc. I do not intend it to refer to protocol state)
+#define POP3_PAUSE_FOR_READ      0x00000001  /* should we pause for the next read */
+#define POP3_PASSWORD_FAILED    0x00000002
+#define POP3_STOPLOGIN              0x00000004  /* error loging in, so stop here */
+#define POP3_AUTH_FAILURE           0x00000008  /* extended code said authentication failed */
+
+
+class nsPop3Protocol : public nsMsgProtocol,
+                       public nsIPop3Protocol,
+                       public nsIMsgAsyncPromptListener
+{
+public:
+  nsPop3Protocol(nsIURI* aURL);
+
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_NSIPOP3PROTOCOL
+  NS_DECL_NSIMSGASYNCPROMPTLISTENER
+
+  nsresult Initialize(nsIURI * aURL);
+  virtual nsresult LoadUrl(nsIURI *aURL, nsISupports * aConsumer = nullptr) override;
+  void Cleanup();
+
+  const char* GetUsername() { return m_username.get(); }
+  void SetUsername(const char* name);
+
+  nsresult StartGetAsyncPassword(Pop3StatesEnum aNextState);
+
+  NS_IMETHOD OnTransportStatus(nsITransport *transport, nsresult status, int64_t progress, int64_t progressMax) override;
+  NS_IMETHOD OnStopRequest(nsIRequest *request, nsISupports * aContext, nsresult aStatus) override;
+  NS_IMETHOD Cancel(nsresult status) override;
+
+  static void MarkMsgInHashTable(PLHashTable *hashTable, const Pop3UidlEntry *uidl,
+                                  bool *changed);
+
+  static nsresult MarkMsgForHost(const char *hostName, const char *userName,
+                                      nsIFile *mailDirectory,
+                                      nsTArray<Pop3UidlEntry*> &UIDLArray);
+private:
+  virtual ~nsPop3Protocol();
+  nsCString m_ApopTimestamp;
+  nsCOMPtr<nsIStringBundle> mLocalBundle;
+
+  nsCString m_username;
+  nsCString m_senderInfo;
+  nsCString m_commandResponse;
+  nsCString m_GSSAPICache;
+
+  // Used for asynchronous password prompts to store the password temporarily.
+  nsCString m_passwordResult;
+
+  // progress state information
+  void UpdateProgressPercent(int64_t totalDone, int64_t total);
+  void UpdateStatus(const char16_t *aStatusName);
+  void UpdateStatusWithString(const char16_t *aString);
+  nsresult FormatCounterString(const nsString &stringName,
+                               uint32_t count1,
+                               uint32_t count2,
+                               nsString &resultString);
+
+  int32_t m_bytesInMsgReceived;
+  int64_t m_totalFolderSize;
+  int64_t m_totalDownloadSize;  /* Number of bytes we're going to
+                                   download.  Might be much less
+                                   than the total_folder_size. */
+  int64_t m_totalBytesReceived; // total # bytes received for the connection
+
+  virtual nsresult ProcessProtocolState(nsIURI * url, nsIInputStream * inputStream,
+                                        uint64_t sourceOffset, uint32_t length) override;
+  virtual int32_t Pop3SendData(const char * dataBuffer, bool aSuppressLogging = false);
+
+  virtual const char* GetType() override {return "pop3";}
+
+  nsCOMPtr<nsIURI> m_url;
+  nsCOMPtr<nsIPop3Sink> m_nsIPop3Sink;
+  nsCOMPtr<nsIPop3IncomingServer> m_pop3Server;
+
+  nsMsgLineStreamBuffer   * m_lineStreamBuffer; // used to efficiently extract lines from the incoming data stream
+  Pop3ConData* m_pop3ConData;
+  void FreeMsgInfo();
+  void Abort();
+
+  bool m_tlsEnabled;
+  int32_t m_socketType;
+  bool m_password_already_sent;
+  bool m_needToRerunUrl;
+
+  void SetCapFlag(uint32_t flag);
+  void ClearCapFlag(uint32_t flag);
+  bool TestCapFlag(uint32_t flag);
+  uint32_t GetCapFlags();
+
+  void    InitPrefAuthMethods(int32_t authMethodPrefValue);
+  nsresult ChooseAuthMethod();
+  void    MarkAuthMethodAsFailed(int32_t failedAuthMethod);
+  void    ResetAuthMethods();
+  int32_t m_prefAuthMethods; // set of capability flags for auth methods
+  int32_t m_failedAuthMethods; // ditto
+  int32_t m_currentAuthMethod; // exactly one capability flag, or 0
+
+  int32_t m_listpos;
+
+  nsresult HandleLine(char *line, uint32_t line_length);
+
+  nsresult GetApopTimestamp();
+
+  //////////////////////////////////////////////////////////////////////////////////////////
+      // Begin Pop3 protocol state handlers
+      //////////////////////////////////////////////////////////////////////////////////////////
+  int32_t WaitForStartOfConnectionResponse(nsIInputStream* inputStream,
+                                           uint32_t length);
+  int32_t WaitForResponse(nsIInputStream* inputStream,
+                          uint32_t length);
+  int32_t Error(const char* err_code, const char16_t **params = nullptr,
+                uint32_t length = 0);
+  int32_t SendAuth();
+  int32_t AuthResponse(nsIInputStream* inputStream, uint32_t length);
+  int32_t SendCapa();
+  int32_t CapaResponse(nsIInputStream* inputStream, uint32_t length);
+  int32_t SendTLSResponse();
+  int32_t ProcessAuth();
+  int32_t NextAuthStep();
+  int32_t AuthLogin();
+  int32_t AuthLoginResponse();
+  int32_t AuthNtlm();
+  int32_t AuthNtlmResponse();
+  int32_t AuthGSSAPI();
+  int32_t AuthGSSAPIResponse(bool first);
+  int32_t SendUsername();
+  int32_t SendPassword();
+  int32_t SendStatOrGurl(bool sendStat);
+  int32_t SendStat();
+  int32_t GetStat();
+  int32_t SendGurl();
+  int32_t GurlResponse();
+  int32_t SendList();
+  int32_t GetList(nsIInputStream* inputStream, uint32_t length);
+  int32_t HandleNoUidListAvailable();
+  int32_t SendXtndXlstMsgid();
+  int32_t GetXtndXlstMsgid(nsIInputStream* inputStream, uint32_t length);
+  int32_t SendUidlList();
+  int32_t GetUidlList(nsIInputStream* inputStream, uint32_t length);
+  int32_t GetMsg();
+  int32_t SendTop();
+  int32_t SendXsender();
+  int32_t XsenderResponse();
+  int32_t SendRetr();
+
+  int32_t RetrResponse(nsIInputStream* inputStream, uint32_t length);
+  int32_t TopResponse(nsIInputStream* inputStream, uint32_t length);
+  int32_t SendDele();
+  int32_t DeleResponse();
+  int32_t CommitState(bool remove_last_entry);
+
+  Pop3StatesEnum GetNextPasswordObtainState();
+  nsresult RerunUrl();
+};
+
+#endif /* nsPop3Protocol_h__ */
diff --git a/mailnews/local/src/nsPop3Service.cpp b/mailnews/local/src/nsPop3Service.cpp
new file mode 100644
index 000000000..d0177b559
--- /dev/null
+++ b/mailnews/local/src/nsPop3Service.cpp
@@ -0,0 +1,711 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "msgCore.h"    // precompiled header...
+
+#include "nsPop3Service.h"
+#include "nsIMsgIncomingServer.h"
+#include "nsIPop3IncomingServer.h"
+
+#include "nsPop3URL.h"
+#include "nsPop3Sink.h"
+#include "nsPop3Protocol.h"
+#include "nsMsgLocalCID.h"
+#include "nsMsgBaseCID.h"
+#include "nsCOMPtr.h"
+#include "nsIMsgWindow.h"
+#include "nsINetUtil.h"
+
+#include "nsIRDFService.h"
+#include "nsRDFCID.h"
+#include "nsIDirectoryService.h"
+#include "nsMailDirServiceDefs.h"
+#include "prprf.h"
+#include "nsMsgUtils.h"
+#include "nsIMsgAccountManager.h"
+#include "nsIMsgAccount.h"
+#include "nsLocalMailFolder.h"
+#include "nsIMailboxUrl.h"
+#include "nsIPrompt.h"
+#include "nsINetUtil.h"
+#include "nsComponentManagerUtils.h"
+#include "nsServiceManagerUtils.h"
+#include "mozilla/Services.h"
+
+#define PREF_MAIL_ROOT_POP3 "mail.root.pop3"        // old - for backward compatibility only
+#define PREF_MAIL_ROOT_POP3_REL "mail.root.pop3-rel"
+
+static NS_DEFINE_CID(kPop3UrlCID, NS_POP3URL_CID);
+static NS_DEFINE_CID(kRDFServiceCID, NS_RDFSERVICE_CID);
+
+nsPop3Service::nsPop3Service()
+{
+}
+
+nsPop3Service::~nsPop3Service()
+{}
+
+NS_IMPL_ISUPPORTS(nsPop3Service,
+                   nsIPop3Service,
+                   nsIProtocolHandler,
+                   nsIMsgProtocolInfo)
+
+NS_IMETHODIMP nsPop3Service::CheckForNewMail(nsIMsgWindow* aMsgWindow,
+                                             nsIUrlListener *aUrlListener,
+                                             nsIMsgFolder *aInbox,
+                                             nsIPop3IncomingServer *aPopServer,
+                                             nsIURI **aURL)
+{
+  return GetMail(false /* don't download, just check */,
+                 aMsgWindow, aUrlListener, aInbox, aPopServer, aURL);
+}
+
+
+nsresult nsPop3Service::GetNewMail(nsIMsgWindow *aMsgWindow,
+                                   nsIUrlListener *aUrlListener,
+                                   nsIMsgFolder *aInbox,
+                                   nsIPop3IncomingServer *aPopServer,
+                                   nsIURI **aURL)
+{
+  return GetMail(true /* download */,
+                 aMsgWindow, aUrlListener, aInbox, aPopServer, aURL);
+}
+
+nsresult nsPop3Service::GetMail(bool downloadNewMail,
+                                nsIMsgWindow *aMsgWindow,
+                                nsIUrlListener *aUrlListener,
+                                nsIMsgFolder *aInbox,
+                                nsIPop3IncomingServer *aPopServer,
+                                nsIURI **aURL)
+{
+
+  NS_ENSURE_ARG_POINTER(aInbox);
+  int32_t popPort = -1;
+
+  nsCOMPtr<nsIMsgIncomingServer> server;
+  nsCOMPtr<nsIURI> url;
+
+  server = do_QueryInterface(aPopServer);
+  NS_ENSURE_TRUE(server, NS_MSG_INVALID_OR_MISSING_SERVER);
+
+  nsCOMPtr<nsIMsgLocalMailFolder> destLocalFolder = do_QueryInterface(aInbox);
+  if (destLocalFolder)
+  {
+    // We don't know the needed size yet, so at least check
+    // if there is some free space (1MB) in the message store.
+    bool destFolderTooBig;
+    destLocalFolder->WarnIfLocalFileTooBig(aMsgWindow, 0xFFFF, &destFolderTooBig);
+    if (destFolderTooBig)
+      return NS_MSG_ERROR_WRITING_MAIL_FOLDER;
+  }
+
+  nsCString popHost;
+  nsCString popUser;
+  nsresult rv = server->GetHostName(popHost);
+  NS_ENSURE_SUCCESS(rv, rv);
+  if (popHost.IsEmpty())
+    return NS_MSG_INVALID_OR_MISSING_SERVER;
+
+  rv = server->GetPort(&popPort);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = server->GetUsername(popUser);
+  NS_ENSURE_SUCCESS(rv, rv);
+  if (popUser.IsEmpty())
+    return NS_MSG_SERVER_USERNAME_MISSING;
+
+  nsCString escapedUsername;
+  MsgEscapeString(popUser, nsINetUtil::ESCAPE_XALPHAS, escapedUsername);
+
+  if (NS_SUCCEEDED(rv) && aPopServer)
+  {
+    // now construct a pop3 url...
+    // we need to escape the username because it may contain
+    // characters like / % or @
+    char * urlSpec = (downloadNewMail)
+      ? PR_smprintf("pop3://%s@%s:%d", escapedUsername.get(), popHost.get(), popPort)
+      : PR_smprintf("pop3://%s@%s:%d/?check", escapedUsername.get(), popHost.get(), popPort);
+    rv = BuildPop3Url(urlSpec, aInbox, aPopServer, aUrlListener, getter_AddRefs(url), aMsgWindow);
+    PR_smprintf_free(urlSpec);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  NS_ENSURE_TRUE(url, rv);
+
+  if (NS_SUCCEEDED(rv))
+    rv = RunPopUrl(server, url);
+
+  if (aURL) // we already have a ref count on pop3url...
+    NS_IF_ADDREF(*aURL = url);
+
+  return rv;
+}
+
+NS_IMETHODIMP nsPop3Service::VerifyLogon(nsIMsgIncomingServer *aServer,
+                                         nsIUrlListener *aUrlListener,
+                                         nsIMsgWindow *aMsgWindow,
+                                         nsIURI **aURL)
+{
+  NS_ENSURE_ARG_POINTER(aServer);
+  nsCString popHost;
+  nsCString popUser;
+  int32_t popPort = -1;
+
+  nsresult rv = aServer->GetHostName(popHost);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  if (popHost.IsEmpty())
+    return NS_MSG_INVALID_OR_MISSING_SERVER;
+
+  rv = aServer->GetPort(&popPort);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = aServer->GetUsername(popUser);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  if (popUser.IsEmpty())
+    return NS_MSG_SERVER_USERNAME_MISSING;
+
+  nsCString escapedUsername;
+  MsgEscapeString(popUser, nsINetUtil::ESCAPE_XALPHAS, escapedUsername);
+
+  nsCOMPtr<nsIPop3IncomingServer> popServer = do_QueryInterface(aServer, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+  // now construct a pop3 url...
+  // we need to escape the username because it may contain
+  // characters like / % or @
+  char *urlSpec = PR_smprintf("pop3://%s@%s:%d/?verifyLogon",
+                              escapedUsername.get(), popHost.get(), popPort);
+  NS_ENSURE_TRUE(urlSpec, NS_ERROR_OUT_OF_MEMORY);
+
+  nsCOMPtr<nsIURI> url;
+  rv = BuildPop3Url(urlSpec, nullptr, popServer, aUrlListener,
+                    getter_AddRefs(url), aMsgWindow);
+  PR_smprintf_free(urlSpec);
+
+  if (NS_SUCCEEDED(rv) && url)
+  {
+    rv = RunPopUrl(aServer, url);
+    if (NS_SUCCEEDED(rv) && aURL)
+      url.forget(aURL);
+  }
+
+  return rv;
+}
+
+nsresult nsPop3Service::BuildPop3Url(const char *urlSpec,
+                                     nsIMsgFolder *inbox,
+                                     nsIPop3IncomingServer *server,
+                                     nsIUrlListener *aUrlListener,
+                                     nsIURI **aUrl,
+                                     nsIMsgWindow *aMsgWindow)
+{
+  nsresult rv;
+
+  nsPop3Sink *pop3Sink = new nsPop3Sink();
+
+  NS_ENSURE_TRUE(pop3Sink, NS_ERROR_OUT_OF_MEMORY);
+
+  pop3Sink->SetPopServer(server);
+  pop3Sink->SetFolder(inbox);
+
+  // now create a pop3 url and a protocol instance to run the url....
+  nsCOMPtr<nsIPop3URL> pop3Url = do_CreateInstance(kPop3UrlCID, &rv);
+  NS_ENSURE_SUCCESS(rv,rv);
+
+  pop3Url->SetPop3Sink(pop3Sink);
+
+  rv = CallQueryInterface(pop3Url, aUrl);
+  NS_ENSURE_SUCCESS(rv,rv);
+
+  rv = (*aUrl)->SetSpec(nsDependentCString(urlSpec));
+  NS_ENSURE_SUCCESS(rv,rv);
+
+  nsCOMPtr<nsIMsgMailNewsUrl> mailnewsurl = do_QueryInterface(pop3Url);
+  if (mailnewsurl)
+  {
+    if (aUrlListener)
+      mailnewsurl->RegisterListener(aUrlListener);
+    if (aMsgWindow)
+      mailnewsurl->SetMsgWindow(aMsgWindow);
+  }
+
+  return rv;
+}
+
+nsresult nsPop3Service::RunPopUrl(nsIMsgIncomingServer *aServer, nsIURI *aUrlToRun)
+{
+
+  NS_ENSURE_ARG_POINTER(aServer);
+  NS_ENSURE_ARG_POINTER(aUrlToRun);
+
+  nsCString userName;
+
+  // load up required server information
+  // we store the username unescaped in the server
+  // so there is no need to unescape it
+  nsresult rv = aServer->GetRealUsername(userName);
+
+  // find out if the server is busy or not...if the server is busy, we are
+  // *NOT* going to run the url
+  bool serverBusy = false;
+  rv = aServer->GetServerBusy(&serverBusy);
+  NS_ENSURE_SUCCESS(rv, rv);
+  if (!serverBusy)
+  {
+    RefPtr<nsPop3Protocol> protocol = new nsPop3Protocol(aUrlToRun);
+    if (protocol)
+    {
+      // the protocol stores the unescaped username, so there is no need to escape it.
+      protocol->SetUsername(userName.get());
+      rv = protocol->LoadUrl(aUrlToRun);
+      if (NS_FAILED(rv))
+        aServer->SetServerBusy(false);
+    }
+  }
+  else
+  {
+    nsCOMPtr<nsIMsgMailNewsUrl> url = do_QueryInterface(aUrlToRun);
+    if (url)
+      AlertServerBusy(url);
+    rv = NS_ERROR_FAILURE;
+  }
+  return rv;
+}
+
+
+NS_IMETHODIMP nsPop3Service::GetScheme(nsACString &aScheme)
+{
+    aScheme.AssignLiteral("pop3");
+    return NS_OK;
+}
+
+NS_IMETHODIMP nsPop3Service::GetDefaultPort(int32_t *aDefaultPort)
+{
+    NS_ENSURE_ARG_POINTER(aDefaultPort);
+    *aDefaultPort = nsIPop3URL::DEFAULT_POP3_PORT;
+    return NS_OK;
+}
+
+NS_IMETHODIMP nsPop3Service::AllowPort(int32_t port, const char *scheme, bool *_retval)
+{
+    *_retval = true; // allow pop on any port
+    return NS_OK;
+}
+
+NS_IMETHODIMP nsPop3Service::GetDefaultDoBiff(bool *aDoBiff)
+{
+    NS_ENSURE_ARG_POINTER(aDoBiff);
+    // by default, do biff for POP3 servers
+    *aDoBiff = true;
+    return NS_OK;
+}
+
+NS_IMETHODIMP nsPop3Service::GetProtocolFlags(uint32_t *result)
+{
+    NS_ENSURE_ARG_POINTER(result);
+    *result = URI_NORELATIVE | URI_DANGEROUS_TO_LOAD | ALLOWS_PROXY |
+              URI_FORBIDS_COOKIE_ACCESS;
+    return NS_OK;
+}
+
+NS_IMETHODIMP nsPop3Service::NewURI(const nsACString &aSpec,
+                                    const char *aOriginCharset, // ignored
+                                    nsIURI *aBaseURI,
+                                    nsIURI **_retval)
+{
+    NS_ENSURE_ARG_POINTER(_retval);
+
+    nsAutoCString folderUri(aSpec);
+    nsCOMPtr<nsIRDFResource> resource;
+    int32_t offset = folderUri.FindChar('?');
+    if (offset != kNotFound)
+      folderUri.SetLength(offset);
+
+    const char *uidl = PL_strstr(nsCString(aSpec).get(), "uidl=");
+    NS_ENSURE_TRUE(uidl, NS_ERROR_FAILURE);
+
+    nsresult rv;
+
+    nsCOMPtr<nsIRDFService> rdfService(do_GetService(kRDFServiceCID, &rv));
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    rv = rdfService->GetResource(folderUri, getter_AddRefs(resource));
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    nsCOMPtr<nsIMsgFolder> folder = do_QueryInterface(resource, &rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    nsCOMPtr<nsIMsgIncomingServer> server;
+
+    nsLocalFolderScanState folderScanState;
+    nsCOMPtr<nsIMsgLocalMailFolder> localFolder = do_QueryInterface(folder);
+    nsCOMPtr<nsIMailboxUrl> mailboxUrl = do_QueryInterface(aBaseURI);
+
+    if (mailboxUrl && localFolder)
+    {
+      rv = localFolder->GetFolderScanState(&folderScanState);
+      NS_ENSURE_SUCCESS(rv, rv);
+      nsCOMPtr<nsIMsgDBHdr> msgHdr;
+      nsMsgKey msgKey;
+      mailboxUrl->GetMessageKey(&msgKey);
+      folder->GetMessageHeader(msgKey, getter_AddRefs(msgHdr));
+      // we do this to get the account key
+      if (msgHdr)
+        localFolder->GetUidlFromFolder(&folderScanState, msgHdr);
+      if (!folderScanState.m_accountKey.IsEmpty())
+      {
+        nsCOMPtr<nsIMsgAccountManager> accountManager =
+                 do_GetService(NS_MSGACCOUNTMANAGER_CONTRACTID, &rv);
+        if (accountManager)
+        {
+          nsCOMPtr<nsIMsgAccount> account;
+          accountManager->GetAccount(folderScanState.m_accountKey, getter_AddRefs(account));
+          if (account)
+            account->GetIncomingServer(getter_AddRefs(server));
+        }
+      }
+    }
+
+    if (!server)
+      rv = folder->GetServer(getter_AddRefs(server));
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    nsCOMPtr<nsIPop3IncomingServer> popServer = do_QueryInterface(server,&rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    nsCString hostname;
+    nsCString username;
+    server->GetHostName(hostname);
+    server->GetUsername(username);
+
+    int32_t port;
+    server->GetPort(&port);
+    if (port == -1) port = nsIPop3URL::DEFAULT_POP3_PORT;
+
+    // we need to escape the username because it may contain
+    // characters like / % or @
+    nsCString escapedUsername;
+    MsgEscapeString(username, nsINetUtil::ESCAPE_XALPHAS, escapedUsername);
+
+    nsAutoCString popSpec("pop://");
+    popSpec += escapedUsername;
+    popSpec += "@";
+    popSpec += hostname;
+    popSpec += ":";
+    popSpec.AppendInt(port);
+    popSpec += "?";
+    popSpec += uidl;
+    nsCOMPtr<nsIUrlListener> urlListener = do_QueryInterface(folder, &rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    rv = BuildPop3Url(popSpec.get(), folder, popServer,
+                      urlListener, _retval, nullptr);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    nsCOMPtr<nsIMsgMailNewsUrl> mailnewsurl = do_QueryInterface(*_retval, &rv);
+    if (NS_SUCCEEDED(rv))
+    {
+      // escape the username before we call SetUsername().  we do this because GetUsername()
+      // will unescape the username
+      mailnewsurl->SetUsername(escapedUsername);
+    }
+
+    nsCOMPtr<nsIPop3URL> popurl = do_QueryInterface(mailnewsurl, &rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    nsAutoCString messageUri (aSpec);
+    if (!strncmp(messageUri.get(), "mailbox:", 8))
+      messageUri.Replace(0, 8, "mailbox-message:");
+    offset = messageUri.Find("?number=");
+    if (offset != kNotFound)
+      messageUri.Replace(offset, 8, "#");
+    offset = messageUri.FindChar('&');
+    if (offset != kNotFound)
+      messageUri.SetLength(offset);
+    popurl->SetMessageUri(messageUri.get());
+    nsCOMPtr<nsIPop3Sink> pop3Sink;
+    rv = popurl->GetPop3Sink(getter_AddRefs(pop3Sink));
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    pop3Sink->SetBuildMessageUri(true);
+
+    return NS_OK;
+}
+
+void nsPop3Service::AlertServerBusy(nsIMsgMailNewsUrl *url)
+{
+  nsresult rv;
+  nsCOMPtr<nsIStringBundleService> bundleService =
+    mozilla::services::GetStringBundleService();
+  if (!bundleService)
+    return;
+  nsCOMPtr<nsIStringBundle> bundle;
+  rv = bundleService->CreateBundle("chrome://messenger/locale/localMsgs.properties", getter_AddRefs(bundle));
+  NS_ENSURE_SUCCESS_VOID(rv);
+
+  nsCOMPtr<nsIMsgWindow> msgWindow;
+  nsCOMPtr<nsIPrompt> dialog;
+  rv = url->GetMsgWindow(getter_AddRefs(msgWindow)); //it is ok to have null msgWindow, for example when biffing
+  if (NS_FAILED(rv) || !msgWindow)
+    return;
+
+  rv = msgWindow->GetPromptDialog(getter_AddRefs(dialog));
+  NS_ENSURE_SUCCESS_VOID(rv);
+
+  nsString accountName;
+  nsCOMPtr<nsIMsgIncomingServer> server;
+  rv = url->GetServer(getter_AddRefs(server));
+  NS_ENSURE_SUCCESS_VOID(rv);
+  rv = server->GetPrettyName(accountName);
+  NS_ENSURE_SUCCESS_VOID(rv);
+
+  const char16_t *params[] = { accountName.get() };
+  nsString alertString;
+  nsString dialogTitle;
+  bundle->FormatStringFromName(
+    u"pop3ServerBusy",
+    params, 1, getter_Copies(alertString));
+  bundle->FormatStringFromName(
+    u"pop3ErrorDialogTitle",
+    params, 1, getter_Copies(dialogTitle));
+  if (!alertString.IsEmpty())
+    dialog->Alert(dialogTitle.get(), alertString.get());
+}
+
+NS_IMETHODIMP nsPop3Service::NewChannel(nsIURI *aURI, nsIChannel **_retval)
+{
+  return NewChannel2(aURI, nullptr, _retval);
+}
+
+NS_IMETHODIMP nsPop3Service::NewChannel2(nsIURI *aURI,
+                                         nsILoadInfo *aLoadInfo,
+                                         nsIChannel **_retval)
+{
+  NS_ENSURE_ARG_POINTER(aURI);
+  nsresult rv;
+
+  nsCOMPtr<nsIMsgMailNewsUrl> url = do_QueryInterface(aURI, &rv);
+  nsCString realUserName;
+  if (NS_SUCCEEDED(rv) && url)
+  {
+    nsCOMPtr<nsIMsgIncomingServer> server;
+    url->GetServer(getter_AddRefs(server));
+    if (server)
+    {
+      // find out if the server is busy or not...if the server is busy, we are
+      // *NOT* going to run the url. The error code isn't quite right...
+      // We might want to put up an error right here.
+      bool serverBusy = false;
+      rv = server->GetServerBusy(&serverBusy);
+      if (serverBusy)
+      {
+        AlertServerBusy(url);
+        return NS_MSG_FOLDER_BUSY;
+      }
+      server->GetRealUsername(realUserName);
+    }
+  }
+
+  RefPtr<nsPop3Protocol> protocol = new nsPop3Protocol(aURI);
+  NS_ENSURE_TRUE(protocol, NS_ERROR_OUT_OF_MEMORY);
+
+  rv = protocol->Initialize(aURI);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = protocol->SetLoadInfo(aLoadInfo);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  protocol->SetUsername(realUserName.get());
+
+  return CallQueryInterface(protocol, _retval);
+}
+
+
+NS_IMETHODIMP
+nsPop3Service::SetDefaultLocalPath(nsIFile *aPath)
+{
+    NS_ENSURE_ARG(aPath);
+    return NS_SetPersistentFile(PREF_MAIL_ROOT_POP3_REL, PREF_MAIL_ROOT_POP3, aPath);
+}
+
+NS_IMETHODIMP
+nsPop3Service::GetDefaultLocalPath(nsIFile **aResult)
+{
+    NS_ENSURE_ARG_POINTER(aResult);
+    *aResult = nullptr;
+
+    bool havePref;
+    nsCOMPtr<nsIFile> localFile;
+    nsresult rv = NS_GetPersistentFile(PREF_MAIL_ROOT_POP3_REL,
+                                       PREF_MAIL_ROOT_POP3,
+                                       NS_APP_MAIL_50_DIR,
+                                       havePref,
+                                       getter_AddRefs(localFile));
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    bool exists;
+    rv = localFile->Exists(&exists);
+    if (NS_SUCCEEDED(rv) && !exists)
+        rv = localFile->Create(nsIFile::DIRECTORY_TYPE, 0775);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    if (!havePref || !exists) {
+        rv = NS_SetPersistentFile(PREF_MAIL_ROOT_POP3_REL, PREF_MAIL_ROOT_POP3, localFile);
+        NS_ASSERTION(NS_SUCCEEDED(rv), "Failed to set root dir pref.");
+    }
+
+    NS_IF_ADDREF(*aResult = localFile);
+    return NS_OK;
+}
+
+
+NS_IMETHODIMP
+nsPop3Service::GetServerIID(nsIID **aServerIID)
+{
+    *aServerIID = new nsIID(NS_GET_IID(nsIPop3IncomingServer));
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPop3Service::GetRequiresUsername(bool *aRequiresUsername)
+{
+    NS_ENSURE_ARG_POINTER(aRequiresUsername);
+    *aRequiresUsername = true;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPop3Service::GetPreflightPrettyNameWithEmailAddress(bool *aPreflightPrettyNameWithEmailAddress)
+{
+    NS_ENSURE_ARG_POINTER(aPreflightPrettyNameWithEmailAddress);
+    *aPreflightPrettyNameWithEmailAddress = true;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPop3Service::GetCanLoginAtStartUp(bool *aCanLoginAtStartUp)
+{
+    NS_ENSURE_ARG_POINTER(aCanLoginAtStartUp);
+    *aCanLoginAtStartUp = true;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPop3Service::GetCanDelete(bool *aCanDelete)
+{
+    NS_ENSURE_ARG_POINTER(aCanDelete);
+    *aCanDelete = true;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPop3Service::GetCanDuplicate(bool *aCanDuplicate)
+{
+    NS_ENSURE_ARG_POINTER(aCanDuplicate);
+    *aCanDuplicate = true;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPop3Service::GetCanGetMessages(bool *aCanGetMessages)
+{
+    NS_ENSURE_ARG_POINTER(aCanGetMessages);
+    *aCanGetMessages = true;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPop3Service::GetCanGetIncomingMessages(bool *aCanGetIncomingMessages)
+{
+    NS_ENSURE_ARG_POINTER(aCanGetIncomingMessages);
+    *aCanGetIncomingMessages = true;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPop3Service::GetShowComposeMsgLink(bool *showComposeMsgLink)
+{
+    NS_ENSURE_ARG_POINTER(showComposeMsgLink);
+    *showComposeMsgLink = true;
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPop3Service::GetFoldersCreatedAsync(bool *aAsyncCreation)
+{
+  NS_ENSURE_ARG_POINTER(aAsyncCreation);
+  *aAsyncCreation = false;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPop3Service::GetDefaultServerPort(bool isSecure, int32_t *aPort)
+{
+    NS_ENSURE_ARG_POINTER(aPort);
+
+    if (!isSecure)
+      return GetDefaultPort(aPort);
+
+    *aPort = nsIPop3URL::DEFAULT_POP3S_PORT;
+
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPop3Service::NotifyDownloadStarted(nsIMsgFolder *aFolder)
+{
+  nsTObserverArray<nsCOMPtr<nsIPop3ServiceListener> >::ForwardIterator
+    iter(mListeners);
+  nsCOMPtr<nsIPop3ServiceListener> listener;
+  while (iter.HasMore()) {
+    listener = iter.GetNext();
+    listener->OnDownloadStarted(aFolder);
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPop3Service::NotifyDownloadProgress(nsIMsgFolder *aFolder,
+                                      uint32_t aNumMessages,
+                                      uint32_t aNumTotalMessages)
+{
+  nsTObserverArray<nsCOMPtr<nsIPop3ServiceListener> >::ForwardIterator
+    iter(mListeners);
+  nsCOMPtr<nsIPop3ServiceListener> listener;
+  while (iter.HasMore()) {
+    listener = iter.GetNext();
+    listener->OnDownloadProgress(aFolder, aNumMessages, aNumTotalMessages);
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPop3Service::NotifyDownloadCompleted(nsIMsgFolder *aFolder,
+                                       uint32_t aNumMessages)
+{
+  nsTObserverArray<nsCOMPtr<nsIPop3ServiceListener> >::ForwardIterator
+    iter(mListeners);
+  nsCOMPtr<nsIPop3ServiceListener> listener;
+  while (iter.HasMore()) {
+    listener = iter.GetNext();
+    listener->OnDownloadCompleted(aFolder, aNumMessages);
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsPop3Service::AddListener(nsIPop3ServiceListener *aListener)
+{
+  NS_ENSURE_ARG_POINTER(aListener);
+  mListeners.AppendElementUnlessExists(aListener);
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsPop3Service::RemoveListener(nsIPop3ServiceListener *aListener)
+{
+  NS_ENSURE_ARG_POINTER(aListener);
+  mListeners.RemoveElement(aListener);
+  return NS_OK;
+}
diff --git a/mailnews/local/src/nsPop3Service.h b/mailnews/local/src/nsPop3Service.h
new file mode 100644
index 000000000..61dd9cf5c
--- /dev/null
+++ b/mailnews/local/src/nsPop3Service.h
@@ -0,0 +1,52 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsPop3Service_h___
+#define nsPop3Service_h___
+
+#include "nscore.h"
+
+#include "nsIPop3Service.h"
+#include "nsIPop3URL.h"
+#include "nsIUrlListener.h"
+#include "nsIStreamListener.h"
+#include "nsIProtocolHandler.h"
+#include "nsIMsgProtocolInfo.h"
+#include "nsTObserverArray.h"
+
+class nsIMsgMailNewsUrl;
+
+class nsPop3Service : public nsIPop3Service,
+                      public nsIProtocolHandler,
+                      public nsIMsgProtocolInfo
+{
+public:
+
+  nsPop3Service();
+  
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIPOP3SERVICE
+  NS_DECL_NSIPROTOCOLHANDLER
+  NS_DECL_NSIMSGPROTOCOLINFO
+
+protected:
+  virtual ~nsPop3Service();
+  nsresult GetMail(bool downloadNewMail,
+                   nsIMsgWindow* aMsgWindow, 
+                   nsIUrlListener * aUrlListener,
+                   nsIMsgFolder *inbox, 
+                   nsIPop3IncomingServer *popServer,
+                   nsIURI ** aURL);
+  // convience function to make constructing of the pop3 url easier...
+  nsresult BuildPop3Url(const char * urlSpec, nsIMsgFolder *inbox,
+                    nsIPop3IncomingServer *, nsIUrlListener * aUrlListener,
+                    nsIURI ** aUrl, nsIMsgWindow *aMsgWindow);
+
+  nsresult RunPopUrl(nsIMsgIncomingServer * aServer, nsIURI * aUrlToRun);
+  void AlertServerBusy(nsIMsgMailNewsUrl *url);
+  nsTObserverArray<nsCOMPtr<nsIPop3ServiceListener> > mListeners;
+};
+
+#endif /* nsPop3Service_h___ */
diff --git a/mailnews/local/src/nsPop3Sink.cpp b/mailnews/local/src/nsPop3Sink.cpp
new file mode 100644
index 000000000..af68ea2be
--- /dev/null
+++ b/mailnews/local/src/nsPop3Sink.cpp
@@ -0,0 +1,1026 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "msgCore.h"    // precompiled header...
+#include "nsPop3Sink.h"
+#include "prprf.h"
+#include "prlog.h"
+#include "nscore.h"
+#include <stdio.h>
+#include <time.h>
+#include "nsParseMailbox.h"
+#include "nsIMsgLocalMailFolder.h"
+#include "nsIMsgIncomingServer.h"
+#include "nsLocalUtils.h"
+#include "nsMsgLocalFolderHdrs.h"
+#include "nsIMsgFolder.h" // TO include biffState enum. Change to bool later...
+#include "nsMailHeaders.h"
+#include "nsIMsgAccountManager.h"
+#include "nsILineInputStream.h"
+#include "nsIPop3Protocol.h"
+#include "nsLocalMailFolder.h"
+#include "nsIPrefBranch.h"
+#include "nsIPrefService.h"
+#include "nsDirectoryServiceDefs.h"
+#include "nsIPrompt.h"
+#include "nsIPromptService.h"
+#include "nsIInterfaceRequestor.h"
+#include "nsIInterfaceRequestorUtils.h"
+#include "nsIDocShell.h"
+#include "mozIDOMWindow.h"
+#include "nsEmbedCID.h"
+#include "nsMsgUtils.h"
+#include "nsMsgBaseCID.h"
+#include "nsServiceManagerUtils.h"
+#include "nsIPop3Service.h"
+#include "nsMsgLocalCID.h"
+#include "mozilla/Services.h"
+#include "mozilla/Logging.h"
+
+/* for logging to Error Console */
+#include "nsIScriptError.h"
+#include "nsIConsoleService.h"
+
+extern PRLogModuleInfo *POP3LOGMODULE; // defined in nsPop3Protocol.cpp
+#define POP3LOG(str) "%s sink: [this=%p] " str, POP3LOGMODULE->name, this
+
+NS_IMPL_ISUPPORTS(nsPop3Sink, nsIPop3Sink)
+
+nsPop3Sink::nsPop3Sink()
+{
+    m_authed = false;
+    m_downloadingToTempFile = false;
+    m_biffState = 0;
+    m_numNewMessages = 0;
+    m_numNewMessagesInFolder = 0;
+    m_numMsgsDownloaded = 0;
+    m_senderAuthed = false;
+    m_outFileStream = nullptr;
+    m_uidlDownload = false;
+    m_buildMessageUri = false;
+    if (!POP3LOGMODULE)
+      POP3LOGMODULE = PR_NewLogModule("POP3");
+}
+
+nsPop3Sink::~nsPop3Sink()
+{
+    MOZ_LOG(POP3LOGMODULE, mozilla::LogLevel::Debug,
+            (POP3LOG("Calling ReleaseFolderLock from ~nsPop3Sink")));
+    ReleaseFolderLock();
+}
+
+nsresult
+nsPop3Sink::SetUserAuthenticated(bool authed)
+{
+  m_authed = authed;
+  m_popServer->SetAuthenticated(authed);
+  return NS_OK;
+}
+
+nsresult
+nsPop3Sink::GetUserAuthenticated(bool* authed)
+{
+  return m_popServer->GetAuthenticated(authed);
+}
+
+nsresult
+nsPop3Sink::SetSenderAuthedFlag(void* closure, bool authed)
+{
+  m_authed = authed;
+  return NS_OK;
+}
+
+nsresult
+nsPop3Sink::SetMailAccountURL(const nsACString &urlString)
+{
+  m_accountUrl.Assign(urlString);
+  return NS_OK;
+}
+
+nsresult
+nsPop3Sink::GetMailAccountURL(nsACString &urlString)
+{
+  urlString.Assign(m_accountUrl);
+  return NS_OK;
+}
+
+partialRecord::partialRecord() :
+  m_msgDBHdr(nullptr)
+{
+}
+
+partialRecord::~partialRecord()
+{
+}
+
+// Walk through all the messages in this folder and look for any
+// PARTIAL messages. For each of those, dig thru the mailbox and
+// find the Account that the message belongs to. If that Account
+// matches the current Account, then look for the Uidl and save
+// this message for later processing.
+nsresult
+nsPop3Sink::FindPartialMessages()
+{
+  nsCOMPtr<nsISimpleEnumerator> messages;
+  bool hasMore = false;
+  bool isOpen = false;
+  nsLocalFolderScanState folderScanState;
+  nsCOMPtr<nsIMsgDatabase> db;
+  nsCOMPtr<nsIMsgLocalMailFolder> localFolder = do_QueryInterface(m_folder);
+  m_folder->GetMsgDatabase(getter_AddRefs(db));
+  if (!localFolder || !db)
+    return NS_ERROR_FAILURE;  // we need it to grub thru the folder
+
+  nsresult rv = db->EnumerateMessages(getter_AddRefs(messages));
+  if (messages)
+    messages->HasMoreElements(&hasMore);
+  while(hasMore && NS_SUCCEEDED(rv))
+  {
+    nsCOMPtr<nsISupports> aSupport;
+    uint32_t flags = 0;
+    rv = messages->GetNext(getter_AddRefs(aSupport));
+    nsCOMPtr<nsIMsgDBHdr> msgDBHdr(do_QueryInterface(aSupport, &rv));
+    msgDBHdr->GetFlags(&flags);
+    if (flags & nsMsgMessageFlags::Partial)
+    {
+      // Open the various streams we need to seek and read from the mailbox
+      if (!isOpen)
+      {
+        rv = localFolder->GetFolderScanState(&folderScanState);
+        if (NS_SUCCEEDED(rv))
+          isOpen = true;
+        else
+          break;
+      }
+      rv = localFolder->GetUidlFromFolder(&folderScanState, msgDBHdr);
+      if (!NS_SUCCEEDED(rv))
+        break;
+
+      // If we got the uidl, see if this partial message belongs to this
+      // account. Add it to the array if so...
+      if (folderScanState.m_uidl &&
+          m_accountKey.Equals(folderScanState.m_accountKey, nsCaseInsensitiveCStringComparator()))
+      {
+        partialRecord *partialMsg = new partialRecord();
+        if (partialMsg)
+        {
+          partialMsg->m_uidl = folderScanState.m_uidl;
+          partialMsg->m_msgDBHdr = msgDBHdr;
+          m_partialMsgsArray.AppendElement(partialMsg);
+        }
+      }
+    }
+    messages->HasMoreElements(&hasMore);
+  }
+  if (isOpen && folderScanState.m_inputStream)
+    folderScanState.m_inputStream->Close();
+  return rv;
+}
+
+// For all the partial messages saved by FindPartialMessages,
+// ask the protocol handler if they still exist on the server.
+// Any messages that don't exist any more are deleted from the
+// msgDB.
+void
+nsPop3Sink::CheckPartialMessages(nsIPop3Protocol *protocol)
+{
+  uint32_t count = m_partialMsgsArray.Length();
+  bool deleted = false;
+
+  for (uint32_t i = 0; i < count; i++)
+  {
+    partialRecord *partialMsg;
+    bool found = true;
+    partialMsg = m_partialMsgsArray.ElementAt(i);
+    protocol->CheckMessage(partialMsg->m_uidl.get(), &found);
+    if (!found && partialMsg->m_msgDBHdr)
+    {
+      if (m_newMailParser)
+        m_newMailParser->m_mailDB->DeleteHeader(partialMsg->m_msgDBHdr, nullptr, false, true);
+      deleted = true;
+    }
+    delete partialMsg;
+  }
+  m_partialMsgsArray.Clear();
+  if (deleted)
+  {
+    nsCOMPtr<nsIMsgLocalMailFolder> localFolder = do_QueryInterface(m_folder);
+    if (localFolder)
+      localFolder->NotifyDelete();
+  }
+}
+
+nsresult
+nsPop3Sink::BeginMailDelivery(bool uidlDownload, nsIMsgWindow *aMsgWindow, bool* aBool)
+{
+  nsresult rv;
+
+  nsCOMPtr<nsIMsgIncomingServer> server = do_QueryInterface(m_popServer);
+  if (!server)
+    return NS_ERROR_UNEXPECTED;
+
+  m_window = aMsgWindow;
+
+  nsCOMPtr <nsIMsgAccountManager> acctMgr = do_GetService(NS_MSGACCOUNTMANAGER_CONTRACTID, &rv);
+  nsCOMPtr <nsIMsgAccount> account;
+  NS_ENSURE_SUCCESS(rv, rv);
+  acctMgr->FindAccountForServer(server, getter_AddRefs(account));
+  if (account)
+    account->GetKey(m_accountKey);
+
+  bool isLocked;
+  nsCOMPtr <nsISupports> supports = do_QueryInterface(static_cast<nsIPop3Sink*>(this));
+  m_folder->GetLocked(&isLocked);
+  if(!isLocked)
+  {
+    MOZ_LOG(POP3LOGMODULE, mozilla::LogLevel::Debug,
+            (POP3LOG("BeginMailDelivery acquiring semaphore")));
+    m_folder->AcquireSemaphore(supports);
+  }
+  else
+  {
+    MOZ_LOG(POP3LOGMODULE, mozilla::LogLevel::Debug,
+            (POP3LOG("BeginMailDelivery folder locked")));
+    return NS_MSG_FOLDER_BUSY;
+  }
+  m_uidlDownload = uidlDownload;
+  if (!uidlDownload)
+    FindPartialMessages();
+
+  m_folder->GetNumNewMessages(false, &m_numNewMessagesInFolder);
+
+#ifdef DEBUG
+  printf("Begin mail message delivery.\n");
+#endif
+  nsCOMPtr<nsIPop3Service> pop3Service(do_GetService(NS_POP3SERVICE_CONTRACTID1, &rv));
+  NS_ENSURE_SUCCESS(rv, rv);
+  pop3Service->NotifyDownloadStarted(m_folder);
+  if (aBool)
+    *aBool = true;
+  return NS_OK;
+}
+
+nsresult
+nsPop3Sink::EndMailDelivery(nsIPop3Protocol *protocol)
+{
+  CheckPartialMessages(protocol);
+
+  if (m_newMailParser)
+  {
+    if (m_outFileStream)
+      m_outFileStream->Flush();  // try this.
+    m_newMailParser->OnStopRequest(nullptr, nullptr, NS_OK);
+    m_newMailParser->EndMsgDownload();
+  }
+  if (m_outFileStream)
+  {
+    m_outFileStream->Close();
+    m_outFileStream = nullptr;
+  }
+
+  if (m_downloadingToTempFile)
+    m_tmpDownloadFile->Remove(false);
+
+  // tell the parser to mark the db valid *after* closing the mailbox.
+  if (m_newMailParser)
+    m_newMailParser->UpdateDBFolderInfo();
+
+  MOZ_LOG(POP3LOGMODULE, mozilla::LogLevel::Debug,
+          (POP3LOG("Calling ReleaseFolderLock from EndMailDelivery")));
+  nsresult rv = ReleaseFolderLock();
+  NS_ASSERTION(NS_SUCCEEDED(rv),"folder lock not released successfully");
+
+  bool filtersRun;
+  m_folder->CallFilterPlugins(nullptr, &filtersRun); // ??? do we need msgWindow?
+  int32_t numNewMessagesInFolder;
+  // if filters have marked msgs read or deleted, the num new messages count
+  // will go negative by the number of messages marked read or deleted,
+  // so if we add that number to the number of msgs downloaded, that will give
+  // us the number of actual new messages.
+  m_folder->GetNumNewMessages(false, &numNewMessagesInFolder);
+  m_numNewMessages -= (m_numNewMessagesInFolder  - numNewMessagesInFolder);
+  m_folder->SetNumNewMessages(m_numNewMessages); // we'll adjust this for spam later
+  if (!filtersRun && m_numNewMessages > 0)
+  {
+    nsCOMPtr <nsIMsgIncomingServer> server;
+    m_folder->GetServer(getter_AddRefs(server));
+    if (server)
+    {
+      server->SetPerformingBiff(true);
+      m_folder->SetBiffState(m_biffState);
+      server->SetPerformingBiff(false);
+    }
+  }
+  // note that size on disk has possibly changed.
+  nsCOMPtr<nsIMsgLocalMailFolder> localFolder = do_QueryInterface(m_folder);
+  if (localFolder)
+    (void) localFolder->RefreshSizeOnDisk();
+  nsCOMPtr<nsIMsgIncomingServer> server = do_QueryInterface(m_popServer);
+  if (server)
+  {
+    nsCOMPtr <nsIMsgFilterList> filterList;
+    rv = server->GetFilterList(nullptr, getter_AddRefs(filterList));
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    if (filterList)
+      (void) filterList->FlushLogIfNecessary();
+  }
+
+  // fix for bug #161999
+  // we should update the summary totals for the folder (inbox)
+  // in case it's not the open folder
+  m_folder->UpdateSummaryTotals(true);
+
+  // check if the folder open in this window is not the current folder, and if it has new
+  // message, in which case we need to try to run the filter plugin.
+  if (m_newMailParser)
+  {
+    nsCOMPtr <nsIMsgWindow> msgWindow;
+    m_newMailParser->GetMsgWindow(getter_AddRefs(msgWindow));
+    // this breaks down if it's biff downloading new mail because
+    // there's no msgWindow...
+    if (msgWindow)
+    {
+      nsCOMPtr <nsIMsgFolder> openFolder;
+      (void) msgWindow->GetOpenFolder(getter_AddRefs(openFolder));
+      if (openFolder && openFolder != m_folder)
+      {
+        // only call filter plugins if folder is a local folder, because only
+        // local folders get messages filtered into them synchronously by pop3.
+        nsCOMPtr<nsIMsgLocalMailFolder> localFolder = do_QueryInterface(openFolder);
+        if (localFolder)
+        {
+          bool hasNew, isLocked;
+          (void) openFolder->GetHasNewMessages(&hasNew);
+          if (hasNew)
+          {
+            // if the open folder is locked, we shouldn't run the spam filters
+            // on it because someone is using the folder. see 218433.
+            // Ideally, the filter plugin code would try to grab the folder lock
+            // and hold onto it until done, but that's more difficult and I think
+            // this will actually fix the problem.
+            openFolder->GetLocked(&isLocked);
+            if(!isLocked)
+              openFolder->CallFilterPlugins(nullptr, &filtersRun);
+          }
+        }
+      }
+    }
+  }
+#ifdef DEBUG
+  printf("End mail message delivery.\n");
+#endif
+  nsCOMPtr<nsIPop3Service> pop3Service(do_GetService(NS_POP3SERVICE_CONTRACTID1, &rv));
+  NS_ENSURE_SUCCESS(rv, rv);
+  pop3Service->NotifyDownloadCompleted(m_folder, m_numNewMessages);
+  return NS_OK;
+}
+
+nsresult
+nsPop3Sink::ReleaseFolderLock()
+{
+  nsresult result = NS_OK;
+  if (!m_folder)
+    return result;
+  bool haveSemaphore;
+  nsCOMPtr <nsISupports> supports = do_QueryInterface(static_cast<nsIPop3Sink*>(this));
+  result = m_folder->TestSemaphore(supports, &haveSemaphore);
+  MOZ_LOG(POP3LOGMODULE, mozilla::LogLevel::Debug,
+          (POP3LOG("ReleaseFolderLock haveSemaphore = %s"), haveSemaphore ? "TRUE" : "FALSE"));
+
+  if(NS_SUCCEEDED(result) && haveSemaphore)
+    result = m_folder->ReleaseSemaphore(supports);
+  return result;
+}
+
+nsresult
+nsPop3Sink::AbortMailDelivery(nsIPop3Protocol *protocol)
+{
+  CheckPartialMessages(protocol);
+
+  // ### PS TODO - discard any new message?
+
+  if (m_outFileStream)
+  {
+    m_outFileStream->Close();
+    m_outFileStream = nullptr;
+  }
+
+  if (m_downloadingToTempFile && m_tmpDownloadFile)
+    m_tmpDownloadFile->Remove(false);
+
+  /* tell the parser to mark the db valid *after* closing the mailbox.
+  we have truncated the inbox, so berkeley mailbox and msf file are in sync*/
+  if (m_newMailParser)
+    m_newMailParser->UpdateDBFolderInfo();
+  MOZ_LOG(POP3LOGMODULE, mozilla::LogLevel::Debug,
+          (POP3LOG("Calling ReleaseFolderLock from AbortMailDelivery")));
+
+  nsresult rv = ReleaseFolderLock();
+  NS_ASSERTION(NS_SUCCEEDED(rv),"folder lock not released successfully");
+
+#ifdef DEBUG
+    printf("Abort mail message delivery.\n");
+#endif
+  nsCOMPtr<nsIPop3Service> pop3Service(do_GetService(NS_POP3SERVICE_CONTRACTID1, &rv));
+  NS_ENSURE_SUCCESS(rv, rv);
+  pop3Service->NotifyDownloadCompleted(m_folder, 0);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPop3Sink::IncorporateBegin(const char* uidlString,
+                             nsIURI* aURL,
+                             uint32_t flags,
+                             void** closure)
+{
+#ifdef DEBUG
+    printf("Incorporate message begin:\n");
+    if (uidlString)
+        printf("uidl string: %s\n", uidlString);
+#endif
+  nsCOMPtr<nsIFile> path;
+
+  m_folder->GetFilePath(getter_AddRefs(path));
+
+  nsresult rv;
+  nsCOMPtr<nsIPrefBranch> pPrefBranch(do_GetService(NS_PREFSERVICE_CONTRACTID, &rv));
+  if (pPrefBranch)
+  {
+    nsCOMPtr<nsIMsgIncomingServer> server;
+    m_folder->GetServer(getter_AddRefs(server));
+    nsCString plugStoreContract;
+    server->GetCharValue("storeContractID", plugStoreContract);
+    // Maildir doesn't care about quaranting, but other stores besides berkeley
+    // mailbox might. We should probably make this an attribute on the pluggable
+    // store, though.
+    if (plugStoreContract.Equals(
+          NS_LITERAL_CSTRING("@mozilla.org/msgstore/berkeleystore;1")))
+      pPrefBranch->GetBoolPref("mailnews.downloadToTempFile", &m_downloadingToTempFile);
+  }
+
+  nsCOMPtr<nsIMsgDBHdr> newHdr;
+
+  nsCOMPtr<nsIMsgIncomingServer> server = do_QueryInterface(m_popServer);
+  if (!server)
+    return NS_ERROR_UNEXPECTED;
+
+  if (m_downloadingToTempFile)
+  {
+    // need to create an nsIOFileStream from a temp file...
+    nsCOMPtr<nsIFile> tmpDownloadFile;
+    rv = GetSpecialDirectoryWithFileName(NS_OS_TEMP_DIR,
+                                         "newmsg",
+                                         getter_AddRefs(tmpDownloadFile));
+
+    NS_ASSERTION(NS_SUCCEEDED(rv),
+                 "writing tmp pop3 download file: failed to append filename");
+    if (NS_FAILED(rv))
+      return rv;
+
+    if (!m_tmpDownloadFile)
+    {
+      //need a unique tmp file to prevent dataloss in multiuser environment
+      rv = tmpDownloadFile->CreateUnique(nsIFile::NORMAL_FILE_TYPE, 00600);
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      m_tmpDownloadFile = do_QueryInterface(tmpDownloadFile, &rv);
+    }
+    if (NS_SUCCEEDED(rv))
+    {
+      rv = MsgGetFileStream(m_tmpDownloadFile, getter_AddRefs(m_outFileStream));
+      NS_ENSURE_SUCCESS(rv, rv);
+    }
+  }
+  else
+  {
+    rv = server->GetMsgStore(getter_AddRefs(m_msgStore));
+    bool reusable;
+    NS_ENSURE_SUCCESS(rv, rv);
+    m_msgStore->GetNewMsgOutputStream(m_folder, getter_AddRefs(newHdr),
+                                      &reusable, getter_AddRefs(m_outFileStream));
+  }
+  // The following (!m_outFileStream etc) was added to make sure that we don't
+  // write somewhere where for some reason or another we can't write to and
+  // lose the messages. See bug 62480
+  if (!m_outFileStream)
+      return NS_ERROR_OUT_OF_MEMORY;
+
+  nsCOMPtr<nsISeekableStream> seekableOutStream = do_QueryInterface(m_outFileStream);
+
+  // create a new mail parser
+  if (!m_newMailParser)
+    m_newMailParser = new nsParseNewMailState;
+  NS_ENSURE_TRUE(m_newMailParser, NS_ERROR_OUT_OF_MEMORY);
+  if (m_uidlDownload)
+    m_newMailParser->DisableFilters();
+
+  nsCOMPtr <nsIMsgFolder> serverFolder;
+  rv = GetServerFolder(getter_AddRefs(serverFolder));
+  if (NS_FAILED(rv)) return rv;
+
+  rv = m_newMailParser->Init(serverFolder, m_folder,
+                             m_window, newHdr, m_outFileStream);
+  // If we failed to initialize the parser, then just don't use it!!!
+  // We can still continue without one.
+
+  if (NS_FAILED(rv))
+  {
+    m_newMailParser = nullptr;
+    rv = NS_OK;
+  }
+
+    if (closure)
+        *closure = (void*) this;
+
+#ifdef DEBUG
+    // Debugging, see bug 1116055.
+    int64_t first_pre_seek_pos;
+    nsresult rv3 = seekableOutStream->Tell(&first_pre_seek_pos);
+#endif
+
+    // XXX Handle error such as network error for remote file system.
+    seekableOutStream->Seek(nsISeekableStream::NS_SEEK_END, 0);
+
+#ifdef DEBUG
+    // Debugging, see bug 1116055.
+    int64_t first_post_seek_pos;
+    nsresult rv4 = seekableOutStream->Tell(&first_post_seek_pos);
+    if (NS_SUCCEEDED(rv3) && NS_SUCCEEDED(rv4)) {
+      if (first_pre_seek_pos != first_post_seek_pos) {
+        nsCOMPtr<nsIMsgFolder> localFolder = do_QueryInterface(m_folder);
+        nsString folderName;
+        if (localFolder)
+          localFolder->GetPrettiestName(folderName);
+        if (!folderName.IsEmpty()) {
+          fprintf(stderr,"(seekdebug) Seek was necessary in IncorporateBegin() for folder %s.\n",
+                  NS_ConvertUTF16toUTF8(folderName).get());
+        } else {
+          fprintf(stderr,"(seekdebug) Seek was necessary in IncorporateBegin().\n");
+        }
+        fprintf(stderr,"(seekdebug) first_pre_seek_pos = 0x%016llx, first_post_seek_pos=0x%016llx\n",
+                (unsigned long long) first_pre_seek_pos, (unsigned long long) first_post_seek_pos);
+      }
+    }
+#endif
+
+    nsCString outputString(GetDummyEnvelope());
+    rv = WriteLineToMailbox(outputString);
+    NS_ENSURE_SUCCESS(rv, rv);
+    // Write out account-key before UIDL so the code that looks for
+    // UIDL will find the account first and know it can stop looking
+    // once it finds the UIDL line.
+    if (!m_accountKey.IsEmpty())
+    {
+      outputString.AssignLiteral(HEADER_X_MOZILLA_ACCOUNT_KEY ": ");
+      outputString.Append(m_accountKey);
+      outputString.AppendLiteral(MSG_LINEBREAK);
+      rv = WriteLineToMailbox(outputString);
+      NS_ENSURE_SUCCESS(rv, rv);
+    }
+    if (uidlString)
+    {
+      outputString.AssignLiteral("X-UIDL: ");
+      outputString.Append(uidlString);
+      outputString.AppendLiteral(MSG_LINEBREAK);
+      rv = WriteLineToMailbox(outputString);
+      NS_ENSURE_SUCCESS(rv, rv);
+    }
+
+    // WriteLineToMailbox("X-Mozilla-Status: 8000" MSG_LINEBREAK);
+    char *statusLine = PR_smprintf(X_MOZILLA_STATUS_FORMAT MSG_LINEBREAK, flags);
+    outputString.Assign(statusLine);
+    rv = WriteLineToMailbox(outputString);
+    PR_smprintf_free(statusLine);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    rv = WriteLineToMailbox(NS_LITERAL_CSTRING("X-Mozilla-Status2: 00000000" MSG_LINEBREAK));
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    // leave space for 60 bytes worth of keys/tags
+    rv = WriteLineToMailbox(NS_LITERAL_CSTRING(X_MOZILLA_KEYWORDS));
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPop3Sink::SetPopServer(nsIPop3IncomingServer *server)
+{
+  m_popServer = server;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPop3Sink::GetPopServer(nsIPop3IncomingServer **aServer)
+{
+  NS_ENSURE_ARG_POINTER(aServer);
+  NS_IF_ADDREF(*aServer = m_popServer);
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsPop3Sink::GetFolder(nsIMsgFolder **aFolder)
+{
+  NS_ENSURE_ARG_POINTER(aFolder);
+  NS_IF_ADDREF(*aFolder = m_folder);
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsPop3Sink::SetFolder(nsIMsgFolder * aFolder)
+{
+  m_folder = aFolder;
+  return NS_OK;
+}
+
+nsresult
+nsPop3Sink::GetServerFolder(nsIMsgFolder **aFolder)
+{
+  NS_ENSURE_ARG_POINTER(aFolder);
+
+  if (m_popServer)
+  {
+    // not sure what this is used for - might be wrong if we have a deferred account.
+    nsCOMPtr <nsIMsgIncomingServer> incomingServer = do_QueryInterface(m_popServer);
+    if (incomingServer)
+      return incomingServer->GetRootFolder(aFolder);
+  }
+  *aFolder = nullptr;
+  return NS_ERROR_NULL_POINTER;
+}
+
+NS_IMETHODIMP nsPop3Sink::SetMsgsToDownload(uint32_t aNumMessages)
+{
+  m_numNewMessages = aNumMessages;
+  return NS_OK;
+}
+
+char*
+nsPop3Sink::GetDummyEnvelope(void)
+{
+  static char result[75];
+  char *ct;
+  time_t now = time ((time_t *) 0);
+#if defined (XP_WIN)
+  if (now < 0 || now > 0x7FFFFFFF)
+    now = 0x7FFFFFFF;
+#endif
+  ct = ctime(&now);
+  PR_ASSERT(ct[24] == '\r' || ct[24] == '\n');
+  ct[24] = 0;
+  /* This value must be in ctime() format, with English abbreviations.
+   strftime("... %c ...") is no good, because it is localized. */
+  PL_strcpy(result, "From - ");
+  PL_strcpy(result + 7, ct);
+  PL_strcpy(result + 7 + 24, MSG_LINEBREAK);
+  return result;
+}
+
+nsresult
+nsPop3Sink::IncorporateWrite(const char* block,
+                             int32_t length)
+{
+  m_outputBuffer.Truncate();
+  if (!strncmp(block, "From ", 5))
+    m_outputBuffer.Assign('>');
+
+  m_outputBuffer.Append(block);
+
+  return WriteLineToMailbox(m_outputBuffer);
+}
+
+nsresult nsPop3Sink::WriteLineToMailbox(const nsACString& buffer)
+{
+  if (!buffer.IsEmpty())
+  {
+    uint32_t bufferLen = buffer.Length();
+    if (m_newMailParser)
+      m_newMailParser->HandleLine(buffer.BeginReading(), bufferLen);
+    // The following (!m_outFileStream etc) was added to make sure that we don't write somewhere
+    // where for some reason or another we can't write to and lose the messages
+    // See bug 62480
+    NS_ENSURE_TRUE(m_outFileStream, NS_ERROR_OUT_OF_MEMORY);
+
+    // To remove seeking to the end for each line to be written, remove the
+    // following line. See bug 1116055 for details.
+#define SEEK_TO_END
+#ifdef  SEEK_TO_END
+    // seek to the end in case someone else has seeked elsewhere in our stream.
+    nsCOMPtr <nsISeekableStream> seekableOutStream = do_QueryInterface(m_outFileStream);
+
+    int64_t before_seek_pos;
+    nsresult rv2 = seekableOutStream->Tell(&before_seek_pos);
+    MOZ_ASSERT(NS_SUCCEEDED(rv2), "seekableOutStream->Tell(&before_seek_pos) failed");
+
+    // XXX Handle error such as network error for remote file system.
+    seekableOutStream->Seek(nsISeekableStream::NS_SEEK_END, 0);
+
+    int64_t after_seek_pos;
+    nsresult rv3 = seekableOutStream->Tell(&after_seek_pos);
+    MOZ_ASSERT(NS_SUCCEEDED(rv3), "seekableOutStream->Tell(&after_seek_pos) failed");
+
+    if (NS_SUCCEEDED(rv2) && NS_SUCCEEDED(rv3)) {
+      if (before_seek_pos != after_seek_pos) {
+        nsCOMPtr<nsIMsgFolder> localFolder = do_QueryInterface(m_folder);
+        nsString folderName;
+        if (localFolder)
+          localFolder->GetPrettiestName(folderName);
+        // This merits a console message, it's poor man's telemetry.
+        MsgLogToConsole4(
+          NS_LITERAL_STRING("Unexpected file position change detected") +
+          (folderName.IsEmpty() ? EmptyString() : NS_LITERAL_STRING(" in folder ")) +
+          (folderName.IsEmpty() ? EmptyString() : folderName) + NS_LITERAL_STRING(". "
+          "If you can reliably reproduce this, please report the steps "
+          "you used to dev-apps-thunderbird@lists.mozilla.org or to bug 1308335 at bugzilla.mozilla.org. "
+          "Resolving this problem will allow speeding up message downloads."),
+          NS_LITERAL_STRING(__FILE__), __LINE__, nsIScriptError::errorFlag);
+#ifdef DEBUG
+        // Debugging, see bug 1116055.
+        if (!folderName.IsEmpty()) {
+          fprintf(stderr,"(seekdebug) WriteLineToMailbox() detected an unexpected file position change in folder %s.\n",
+                  NS_ConvertUTF16toUTF8(folderName).get());
+        } else {
+          fprintf(stderr,"(seekdebug) WriteLineToMailbox() detected an unexpected file position change.\n");
+        }
+        fprintf(stderr,"(seekdebug) before_seek_pos=0x%016llx, after_seek_pos=0x%016llx\n",
+                (long long unsigned int) before_seek_pos, (long long unsigned int) after_seek_pos);
+#endif
+      }
+    }
+#endif
+
+    uint32_t bytesWritten;
+    m_outFileStream->Write(buffer.BeginReading(), bufferLen, &bytesWritten);
+    NS_ENSURE_TRUE(bytesWritten == bufferLen, NS_ERROR_FAILURE);
+  }
+  return NS_OK;
+}
+
+nsresult nsPop3Sink::HandleTempDownloadFailed(nsIMsgWindow *msgWindow)
+{
+  nsresult rv;
+  nsCOMPtr<nsIStringBundleService> bundleService =
+    mozilla::services::GetStringBundleService();
+  NS_ENSURE_TRUE(bundleService, NS_ERROR_UNEXPECTED);
+  nsCOMPtr<nsIStringBundle> bundle;
+  rv = bundleService->CreateBundle("chrome://messenger/locale/localMsgs.properties", getter_AddRefs(bundle));
+  NS_ENSURE_SUCCESS(rv, rv);
+  nsString fromStr, subjectStr, confirmString;
+
+  m_newMailParser->m_newMsgHdr->GetMime2DecodedSubject(subjectStr);
+  m_newMailParser->m_newMsgHdr->GetMime2DecodedAuthor(fromStr);
+  const char16_t *params[] = { fromStr.get(), subjectStr.get() };
+  bundle->FormatStringFromName(
+    u"pop3TmpDownloadError",
+    params, 2, getter_Copies(confirmString));
+  nsCOMPtr<mozIDOMWindowProxy> parentWindow;
+  nsCOMPtr<nsIPromptService> promptService = do_GetService(NS_PROMPTSERVICE_CONTRACTID);
+  nsCOMPtr<nsIDocShell> docShell;
+  if (msgWindow)
+  {
+    (void) msgWindow->GetRootDocShell(getter_AddRefs(docShell));
+    parentWindow = do_QueryInterface(docShell);
+  }
+  if (promptService && !confirmString.IsEmpty())
+  {
+    int32_t dlgResult  = -1;
+    bool dummyValue = false;
+    rv = promptService->ConfirmEx(parentWindow, nullptr, confirmString.get(),
+                      nsIPromptService::STD_YES_NO_BUTTONS,
+                      nullptr,
+                      nullptr,
+                      nullptr,
+                      nullptr,
+                      &dummyValue,
+                      &dlgResult);
+    m_newMailParser->m_newMsgHdr = nullptr;
+
+    return (dlgResult == 0) ? NS_OK : NS_MSG_ERROR_COPYING_FROM_TMP_DOWNLOAD;
+  }
+  return rv;
+}
+
+
+NS_IMETHODIMP
+nsPop3Sink::IncorporateComplete(nsIMsgWindow *aMsgWindow, int32_t aSize)
+{
+  if (m_buildMessageUri && !m_baseMessageUri.IsEmpty() && m_newMailParser &&
+      m_newMailParser->m_newMsgHdr)
+  {
+    nsMsgKey msgKey;
+    m_newMailParser->m_newMsgHdr->GetMessageKey(&msgKey);
+    m_messageUri.Truncate();
+    nsBuildLocalMessageURI(m_baseMessageUri.get(), msgKey, m_messageUri);
+  }
+
+  nsresult rv = WriteLineToMailbox(NS_LITERAL_CSTRING(MSG_LINEBREAK));
+  NS_ENSURE_SUCCESS(rv, rv);
+  bool leaveOnServer = false;
+  m_popServer->GetLeaveMessagesOnServer(&leaveOnServer);
+  // We need to flush the output stream, in case mail filters move
+  // the new message, which relies on all the data being flushed.
+  rv = m_outFileStream->Flush(); // Make sure the message is written to the disk
+  NS_ENSURE_SUCCESS(rv, rv);
+  NS_ASSERTION(m_newMailParser, "could not get m_newMailParser");
+  if (m_newMailParser)
+  {
+    // PublishMsgHdr clears m_newMsgHdr, so we need a comptr to
+    // hold onto it.
+    nsCOMPtr<nsIMsgDBHdr> hdr = m_newMailParser->m_newMsgHdr;
+    NS_ASSERTION(hdr, "m_newMailParser->m_newMsgHdr wasn't set");
+    if (!hdr)
+      return NS_ERROR_FAILURE;
+
+    nsCOMPtr<nsIMsgLocalMailFolder> localFolder = do_QueryInterface(m_folder);
+    bool doSelect = false;
+
+    // aSize is only set for partial messages. For full messages,
+    // check to see if we're replacing an old partial message.
+    if (!aSize && localFolder)
+      (void) localFolder->DeleteDownloadMsg(hdr, &doSelect);
+
+    // If a header already exists for this message (for example, when
+    // getting a complete message when a partial exists), then update the new
+    // header from the old.
+    if (!m_origMessageUri.IsEmpty() && localFolder)
+    {
+      nsCOMPtr <nsIMsgDBHdr> oldMsgHdr;
+      rv = GetMsgDBHdrFromURI(m_origMessageUri.get(), getter_AddRefs(oldMsgHdr));
+      if (NS_SUCCEEDED(rv) && oldMsgHdr)
+        localFolder->UpdateNewMsgHdr(oldMsgHdr, hdr);
+    }
+
+    if (m_downloadingToTempFile)
+    {
+      // close file to give virus checkers a chance to do their thing...
+      m_outFileStream->Flush();
+      m_outFileStream->Close();
+      m_newMailParser->FinishHeader();
+      // need to re-open the inbox file stream.
+      bool exists;
+      m_tmpDownloadFile->Exists(&exists);
+      if (!exists)
+        return HandleTempDownloadFailed(aMsgWindow);
+
+      nsCOMPtr <nsIInputStream> inboxInputStream = do_QueryInterface(m_outFileStream);
+      rv = MsgReopenFileStream(m_tmpDownloadFile, inboxInputStream);
+      NS_ENSURE_SUCCESS(rv, HandleTempDownloadFailed(aMsgWindow));
+      if (m_outFileStream)
+      {
+        int64_t tmpDownloadFileSize;
+        uint32_t msgSize;
+        hdr->GetMessageSize(&msgSize);
+        // we need to clone because nsLocalFileUnix caches its stat result,
+        // so it doesn't realize the file has changed size.
+        nsCOMPtr <nsIFile> tmpClone;
+        rv = m_tmpDownloadFile->Clone(getter_AddRefs(tmpClone));
+        NS_ENSURE_SUCCESS(rv, rv);
+        tmpClone->GetFileSize(&tmpDownloadFileSize);
+
+        if (msgSize > tmpDownloadFileSize)
+          rv = NS_MSG_ERROR_WRITING_MAIL_FOLDER;
+        else
+          rv = m_newMailParser->AppendMsgFromStream(inboxInputStream, hdr,
+                                                    msgSize, m_folder);
+        if (NS_FAILED(rv))
+          return HandleTempDownloadFailed(aMsgWindow);
+
+        m_outFileStream->Close(); // close so we can truncate.
+        m_tmpDownloadFile->SetFileSize(0);
+      }
+      else
+      {
+          return HandleTempDownloadFailed(aMsgWindow);
+        // need to give an error here.
+      }
+    }
+    else
+    {
+      m_msgStore->FinishNewMessage(m_outFileStream, hdr);
+    }
+    m_newMailParser->PublishMsgHeader(aMsgWindow);
+    // run any reply/forward filter after we've finished with the
+    // temp quarantine file, and/or moved the message to another folder.
+    m_newMailParser->ApplyForwardAndReplyFilter(aMsgWindow);
+    if (aSize)
+      hdr->SetUint32Property("onlineSize", aSize);
+
+    // if DeleteDownloadMsg requested it, select the new message
+    else if (doSelect)
+      (void) localFolder->SelectDownloadMsg();
+  }
+
+#ifdef DEBUG
+  printf("Incorporate message complete.\n");
+#endif
+  nsCOMPtr<nsIPop3Service> pop3Service(do_GetService(NS_POP3SERVICE_CONTRACTID1, &rv));
+  NS_ENSURE_SUCCESS(rv, rv);
+  pop3Service->NotifyDownloadProgress(m_folder, ++m_numMsgsDownloaded, m_numNewMessages);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPop3Sink::IncorporateAbort(bool uidlDownload)
+{
+  nsresult rv = m_outFileStream->Close();
+  NS_ENSURE_SUCCESS(rv,rv);
+  if (!m_downloadingToTempFile && m_msgStore && m_newMailParser &&
+      m_newMailParser->m_newMsgHdr)
+  {
+      m_msgStore->DiscardNewMessage(m_outFileStream,
+                                    m_newMailParser->m_newMsgHdr);
+  }
+#ifdef DEBUG
+  printf("Incorporate message abort.\n");
+#endif
+  return rv;
+}
+
+nsresult
+nsPop3Sink::BiffGetNewMail()
+{
+#ifdef DEBUG
+    printf("Biff get new mail.\n");
+#endif
+    return NS_OK;
+}
+
+nsresult
+nsPop3Sink::SetBiffStateAndUpdateFE(uint32_t aBiffState, int32_t numNewMessages, bool notify)
+{
+  m_biffState = aBiffState;
+  if (m_newMailParser)
+    numNewMessages -= m_newMailParser->m_numNotNewMessages;
+
+  if (notify && m_folder && numNewMessages > 0 && numNewMessages != m_numNewMessages
+      && aBiffState == nsIMsgFolder::nsMsgBiffState_NewMail)
+  {
+    m_folder->SetNumNewMessages(numNewMessages);
+    m_folder->SetBiffState(aBiffState);
+  }
+  m_numNewMessages = numNewMessages;
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPop3Sink::GetBuildMessageUri(bool *bVal)
+{
+  NS_ENSURE_ARG_POINTER(bVal);
+  *bVal = m_buildMessageUri;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPop3Sink::SetBuildMessageUri(bool bVal)
+{
+  m_buildMessageUri = bVal;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPop3Sink::GetMessageUri(char **messageUri)
+{
+  NS_ENSURE_ARG_POINTER(messageUri);
+  NS_ENSURE_TRUE(!m_messageUri.IsEmpty(), NS_ERROR_FAILURE);
+  *messageUri = ToNewCString(m_messageUri);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPop3Sink::SetMessageUri(const char *messageUri)
+{
+  NS_ENSURE_ARG_POINTER(messageUri);
+  m_messageUri = messageUri;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPop3Sink::GetBaseMessageUri(char ** baseMessageUri)
+{
+  NS_ENSURE_ARG_POINTER(baseMessageUri);
+  NS_ENSURE_TRUE(!m_baseMessageUri.IsEmpty(), NS_ERROR_FAILURE);
+  *baseMessageUri = ToNewCString(m_baseMessageUri);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPop3Sink::SetBaseMessageUri(const char *baseMessageUri)
+{
+  NS_ENSURE_ARG_POINTER(baseMessageUri);
+  m_baseMessageUri = baseMessageUri;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPop3Sink::GetOrigMessageUri(nsACString& aOrigMessageUri)
+{
+  aOrigMessageUri.Assign(m_origMessageUri);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPop3Sink::SetOrigMessageUri(const nsACString& aOrigMessageUri)
+{
+  m_origMessageUri.Assign(aOrigMessageUri);
+  return NS_OK;
+}
diff --git a/mailnews/local/src/nsPop3Sink.h b/mailnews/local/src/nsPop3Sink.h
new file mode 100644
index 000000000..bd11eba35
--- /dev/null
+++ b/mailnews/local/src/nsPop3Sink.h
@@ -0,0 +1,78 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+#ifndef nsPop3Sink_h__
+#define nsPop3Sink_h__
+
+#include "nscore.h"
+#include "nsIURL.h"
+#include "nsIPop3Sink.h"
+#include "nsIOutputStream.h"
+#include "prmem.h"
+#include "prio.h"
+#include "plstr.h"
+#include "prenv.h"
+#include "nsIMsgFolder.h"
+#include "nsAutoPtr.h"
+#include "nsTArray.h"
+#include "nsStringGlue.h"
+
+class nsParseNewMailState;
+class nsIMsgFolder;
+
+struct partialRecord
+{
+  partialRecord();
+  ~partialRecord();
+
+  nsCOMPtr<nsIMsgDBHdr> m_msgDBHdr;
+  nsCString m_uidl;
+};
+
+class nsPop3Sink : public nsIPop3Sink
+{
+public:
+    nsPop3Sink();
+
+    NS_DECL_THREADSAFE_ISUPPORTS
+    NS_DECL_NSIPOP3SINK
+    nsresult GetServerFolder(nsIMsgFolder **aFolder);
+    nsresult FindPartialMessages();
+    void CheckPartialMessages(nsIPop3Protocol *protocol);
+
+    static char*  GetDummyEnvelope(void);
+
+protected:
+    virtual ~nsPop3Sink();
+    nsresult WriteLineToMailbox(const nsACString& buffer);
+    nsresult ReleaseFolderLock();
+    nsresult HandleTempDownloadFailed(nsIMsgWindow *msgWindow);
+
+    bool m_authed;
+    nsCString m_accountUrl;
+    uint32_t m_biffState;
+    int32_t m_numNewMessages;
+    int32_t m_numNewMessagesInFolder;
+    int32_t m_numMsgsDownloaded;
+    bool m_senderAuthed;
+    nsCString m_outputBuffer;
+    nsCOMPtr<nsIPop3IncomingServer> m_popServer;
+    //Currently the folder we want to update about biff info
+    nsCOMPtr<nsIMsgFolder> m_folder;
+    RefPtr<nsParseNewMailState> m_newMailParser;
+    nsCOMPtr <nsIOutputStream> m_outFileStream; // the file we write to, which may be temporary
+    nsCOMPtr<nsIMsgPluggableStore> m_msgStore;
+    bool m_uidlDownload;
+    bool m_buildMessageUri;
+    bool m_downloadingToTempFile;
+    nsCOMPtr <nsIFile> m_tmpDownloadFile;
+    nsCOMPtr<nsIMsgWindow> m_window;
+    nsCString m_messageUri;
+    nsCString m_baseMessageUri;
+    nsCString m_origMessageUri;
+    nsCString m_accountKey;
+    nsTArray<partialRecord*> m_partialMsgsArray;
+};
+
+#endif
diff --git a/mailnews/local/src/nsPop3URL.cpp b/mailnews/local/src/nsPop3URL.cpp
new file mode 100644
index 000000000..f3d724793
--- /dev/null
+++ b/mailnews/local/src/nsPop3URL.cpp
@@ -0,0 +1,63 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "msgCore.h"    // precompiled header...
+
+#include "nsIURL.h"
+#include "nsPop3URL.h"
+#include "nsPop3Protocol.h"
+#include "nsStringGlue.h"
+#include "prmem.h"
+#include "plstr.h"
+#include "prprf.h"
+
+nsPop3URL::nsPop3URL(): nsMsgMailNewsUrl()
+{
+}
+
+nsPop3URL::~nsPop3URL()
+{
+}
+
+NS_IMPL_ISUPPORTS_INHERITED(nsPop3URL, nsMsgMailNewsUrl, nsIPop3URL)
+
+
+////////////////////////////////////////////////////////////////////////////////////
+// Begin nsIPop3URL specific support
+////////////////////////////////////////////////////////////////////////////////////
+
+nsresult nsPop3URL::SetPop3Sink(nsIPop3Sink* aPop3Sink)
+{
+    if (aPop3Sink)
+        m_pop3Sink = aPop3Sink;
+    return NS_OK;
+}
+
+nsresult nsPop3URL::GetPop3Sink(nsIPop3Sink** aPop3Sink)
+{
+    if (aPop3Sink)
+    {
+        *aPop3Sink = m_pop3Sink;
+        NS_IF_ADDREF(*aPop3Sink);
+    }
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPop3URL::GetMessageUri(char ** aMessageUri)
+{
+    if(!aMessageUri || m_messageUri.IsEmpty())
+        return NS_ERROR_NULL_POINTER;
+    *aMessageUri = ToNewCString(m_messageUri);
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsPop3URL::SetMessageUri(const char *aMessageUri)
+{
+    if (aMessageUri)
+        m_messageUri = aMessageUri;
+    return NS_OK;
+}
diff --git a/mailnews/local/src/nsPop3URL.h b/mailnews/local/src/nsPop3URL.h
new file mode 100644
index 000000000..4c6ec6b0a
--- /dev/null
+++ b/mailnews/local/src/nsPop3URL.h
@@ -0,0 +1,30 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsPop3URL_h__
+#define nsPop3URL_h__
+
+#include "nsIPop3URL.h"
+#include "nsMsgMailNewsUrl.h"
+#include "nsIMsgIncomingServer.h"
+#include "nsCOMPtr.h"
+
+class nsPop3URL : public nsIPop3URL, public nsMsgMailNewsUrl
+{
+public:
+  NS_DECL_NSIPOP3URL
+  nsPop3URL();
+  NS_DECL_ISUPPORTS_INHERITED
+
+protected:
+  virtual ~nsPop3URL();
+
+  nsCString m_messageUri;
+
+  /* Pop3 specific event sinks */
+  nsCOMPtr<nsIPop3Sink> m_pop3Sink;
+};
+
+#endif // nsPop3URL_h__
diff --git a/mailnews/local/src/nsRssIncomingServer.cpp b/mailnews/local/src/nsRssIncomingServer.cpp
new file mode 100644
index 000000000..fe1e8abe3
--- /dev/null
+++ b/mailnews/local/src/nsRssIncomingServer.cpp
@@ -0,0 +1,260 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsIRssService.h"
+#include "nsRssIncomingServer.h"
+#include "nsMsgFolderFlags.h"
+#include "nsINewsBlogFeedDownloader.h"
+#include "nsMsgBaseCID.h"
+#include "nsIFile.h"
+#include "nsIMsgFolderNotificationService.h"
+
+#include "nsIMsgLocalMailFolder.h"
+#include "nsIDBFolderInfo.h"
+#include "nsServiceManagerUtils.h"
+#include "nsComponentManagerUtils.h"
+#include "nsArrayUtils.h"
+#include "nsMsgUtils.h"
+
+nsrefcnt nsRssIncomingServer::gInstanceCount    = 0;
+
+NS_IMPL_ISUPPORTS_INHERITED(nsRssIncomingServer,
+                             nsMsgIncomingServer,
+                             nsIRssIncomingServer,
+                             nsIMsgFolderListener,
+                             nsILocalMailIncomingServer)
+
+nsRssIncomingServer::nsRssIncomingServer()
+{
+  m_canHaveFilters = true;
+
+  if (gInstanceCount == 0)
+  {
+    nsresult rv;
+    nsCOMPtr<nsIMsgFolderNotificationService> notifyService =
+      do_GetService(NS_MSGNOTIFICATIONSERVICE_CONTRACTID, &rv);
+    if (NS_SUCCEEDED(rv))
+      notifyService->AddListener(this,
+          nsIMsgFolderNotificationService::folderAdded |
+          nsIMsgFolderNotificationService::folderDeleted |
+          nsIMsgFolderNotificationService::folderMoveCopyCompleted |
+          nsIMsgFolderNotificationService::folderRenamed);
+  }
+
+  gInstanceCount++;
+}
+
+nsRssIncomingServer::~nsRssIncomingServer()
+{
+  gInstanceCount--;
+
+  if (gInstanceCount == 0)
+  {
+    nsresult rv;
+    nsCOMPtr<nsIMsgFolderNotificationService> notifyService =
+      do_GetService(NS_MSGNOTIFICATIONSERVICE_CONTRACTID, &rv);
+    if (NS_SUCCEEDED(rv))
+      notifyService->RemoveListener(this);
+  }
+}
+
+nsresult nsRssIncomingServer::FillInDataSourcePath(const nsAString& aDataSourceName,
+                                                   nsIFile ** aLocation)
+{
+  nsresult rv;
+  // Get the local path for this server.
+  nsCOMPtr<nsIFile> localFile;
+  rv = GetLocalPath(getter_AddRefs(localFile));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // Append the name of the subscriptions data source.
+  rv = localFile->Append(aDataSourceName);
+  NS_IF_ADDREF(*aLocation = localFile);
+  return rv;
+}
+
+// nsIRSSIncomingServer methods
+NS_IMETHODIMP nsRssIncomingServer::GetSubscriptionsDataSourcePath(nsIFile ** aLocation)
+{
+  return FillInDataSourcePath(NS_LITERAL_STRING("feeds.rdf"), aLocation);
+}
+
+NS_IMETHODIMP nsRssIncomingServer::GetFeedItemsDataSourcePath(nsIFile ** aLocation)
+{
+  return FillInDataSourcePath(NS_LITERAL_STRING("feeditems.rdf"), aLocation);
+}
+
+NS_IMETHODIMP nsRssIncomingServer::CreateDefaultMailboxes()
+{
+  // For Feeds, all we have is Trash.
+  return CreateLocalFolder(NS_LITERAL_STRING("Trash"));
+}
+
+NS_IMETHODIMP nsRssIncomingServer::SetFlagsOnDefaultMailboxes()
+{
+  nsCOMPtr<nsIMsgFolder> rootFolder;
+  nsresult rv = GetRootFolder(getter_AddRefs(rootFolder));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsIMsgLocalMailFolder> localFolder = do_QueryInterface(rootFolder, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  localFolder->SetFlagsOnDefaultMailboxes(nsMsgFolderFlags::Trash);
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsRssIncomingServer::PerformBiff(nsIMsgWindow *aMsgWindow)
+{
+  // Get the account root (server) folder and pass it on.
+  nsCOMPtr<nsIMsgFolder> rootRSSFolder;
+  GetRootMsgFolder(getter_AddRefs(rootRSSFolder));
+  nsCOMPtr<nsIUrlListener> urlListener = do_QueryInterface(rootRSSFolder);
+  nsresult rv;
+  bool isBiff = true;
+  nsCOMPtr<nsINewsBlogFeedDownloader> rssDownloader =
+    do_GetService("@mozilla.org/newsblog-feed-downloader;1", &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+  rssDownloader->DownloadFeed(rootRSSFolder, urlListener, isBiff, aMsgWindow);
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsRssIncomingServer::GetNewMail(nsIMsgWindow *aMsgWindow,
+                                              nsIUrlListener *aUrlListener,
+                                              nsIMsgFolder *aFolder,
+                                              nsIURI **_retval)
+{
+  // Pass the selected folder on to the downloader.
+  NS_ENSURE_ARG_POINTER(aFolder);
+  nsresult rv;
+  bool isBiff = false;
+  nsCOMPtr<nsINewsBlogFeedDownloader> rssDownloader =
+    do_GetService("@mozilla.org/newsblog-feed-downloader;1", &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+  rssDownloader->DownloadFeed(aFolder, aUrlListener, isBiff, aMsgWindow);
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsRssIncomingServer::GetAccountManagerChrome(nsAString& aResult)
+{
+  aResult.AssignLiteral("am-newsblog.xul");
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsRssIncomingServer::GetOfflineSupportLevel(int32_t *aSupportLevel)
+{
+  NS_ENSURE_ARG_POINTER(aSupportLevel);
+  *aSupportLevel = OFFLINE_SUPPORT_LEVEL_NONE;
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsRssIncomingServer::GetSupportsDiskSpace(bool *aSupportsDiskSpace)
+{
+  NS_ENSURE_ARG_POINTER(aSupportsDiskSpace);
+  *aSupportsDiskSpace = true;
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsRssIncomingServer::GetServerRequiresPasswordForBiff(bool *aServerRequiresPasswordForBiff)
+{
+  NS_ENSURE_ARG_POINTER(aServerRequiresPasswordForBiff);
+  // For Feed folders, we don't require a password.
+  *aServerRequiresPasswordForBiff = false;
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsRssIncomingServer::GetCanSearchMessages(bool *canSearchMessages)
+{
+  NS_ENSURE_ARG_POINTER(canSearchMessages);
+  *canSearchMessages = true;
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsRssIncomingServer::MsgAdded(nsIMsgDBHdr *aMsg)
+{
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP nsRssIncomingServer::MsgsClassified(nsIArray *aMsgs,
+                                                  bool aJunkProcessed,
+                                                  bool aTraitProcessed)
+{
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP nsRssIncomingServer::MsgsDeleted(nsIArray *aMsgs)
+{
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP nsRssIncomingServer::MsgsMoveCopyCompleted(bool aMove,
+                                                         nsIArray *aSrcMsgs,
+                                                         nsIMsgFolder *aDestFolder,
+  nsIArray *aDestMsgs)
+{
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP nsRssIncomingServer::MsgKeyChanged(nsMsgKey aOldKey,
+                                                 nsIMsgDBHdr *aNewHdr)
+{
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP nsRssIncomingServer::FolderAdded(nsIMsgFolder *aFolder)
+{
+  // Nothing to do. Not necessary for new folder adds, as a new folder never
+  // has a subscription.
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsRssIncomingServer::FolderDeleted(nsIMsgFolder *aFolder)
+{
+  // Not necessary for folder deletes, which are move to Trash and handled by
+  // movecopy. Virtual folder or trash folder deletes send a folderdeleted,
+  // but these should have no subscriptions already.
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsRssIncomingServer::FolderMoveCopyCompleted(bool aMove,
+                                                           nsIMsgFolder *aSrcFolder,
+                                                           nsIMsgFolder *aDestFolder)
+{
+  return FolderChanged(aDestFolder, aSrcFolder, (aMove ? "move" : "copy"));
+}
+
+NS_IMETHODIMP nsRssIncomingServer::FolderRenamed(nsIMsgFolder *aOrigFolder,
+                                                 nsIMsgFolder *aNewFolder)
+{
+  return FolderChanged(aNewFolder, aOrigFolder, "rename");
+}
+
+NS_IMETHODIMP nsRssIncomingServer::ItemEvent(nsISupports *aItem,
+                                             const nsACString &aEvent,
+                                             nsISupports *aData)
+{
+  return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+nsresult nsRssIncomingServer::FolderChanged(nsIMsgFolder *aFolder,
+                                            nsIMsgFolder *aOrigFolder,
+                                            const char *aAction)
+{
+  if (!aFolder)
+    return NS_OK;
+
+  nsresult rv;
+  nsCOMPtr<nsINewsBlogFeedDownloader> rssDownloader =
+    do_GetService("@mozilla.org/newsblog-feed-downloader;1", &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+  rssDownloader->UpdateSubscriptionsDS(aFolder, aOrigFolder, aAction);
+  return rv;
+}
+
+NS_IMETHODIMP
+nsRssIncomingServer::GetSortOrder(int32_t* aSortOrder)
+{
+  NS_ENSURE_ARG_POINTER(aSortOrder);
+  *aSortOrder = 400000000;
+  return NS_OK;
+}
diff --git a/mailnews/local/src/nsRssIncomingServer.h b/mailnews/local/src/nsRssIncomingServer.h
new file mode 100644
index 000000000..67406f19a
--- /dev/null
+++ b/mailnews/local/src/nsRssIncomingServer.h
@@ -0,0 +1,43 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef __nsRssIncomingServer_h
+#define __nsRssIncomingServer_h
+
+#include "mozilla/Attributes.h"
+#include "nsIRssIncomingServer.h"
+#include "nsILocalMailIncomingServer.h"
+#include "nsMsgIncomingServer.h"
+#include "nsIMsgFolderListener.h"
+#include "nsMailboxServer.h"
+
+class nsRssIncomingServer : public nsMailboxServer,
+                            public nsIRssIncomingServer,
+                            public nsILocalMailIncomingServer,
+                            public nsIMsgFolderListener
+
+{
+public:
+    NS_DECL_ISUPPORTS_INHERITED
+    NS_DECL_NSIRSSINCOMINGSERVER
+    NS_DECL_NSILOCALMAILINCOMINGSERVER
+    NS_DECL_NSIMSGFOLDERLISTENER
+
+    NS_IMETHOD GetOfflineSupportLevel(int32_t *aSupportLevel) override;
+    NS_IMETHOD GetSupportsDiskSpace(bool *aSupportsDiskSpace) override;
+    NS_IMETHOD GetAccountManagerChrome(nsAString& aResult) override;
+    NS_IMETHOD PerformBiff(nsIMsgWindow *aMsgWindow) override;
+    NS_IMETHOD GetServerRequiresPasswordForBiff(bool *aServerRequiresPasswordForBiff) override;
+    NS_IMETHOD GetCanSearchMessages(bool *canSearchMessages) override;
+    NS_IMETHOD GetSortOrder(int32_t* aSortOrder) override;
+
+    nsRssIncomingServer();
+protected:
+    virtual ~nsRssIncomingServer();
+    nsresult FolderChanged(nsIMsgFolder *aFolder, nsIMsgFolder *aOrigFolder, const char *aAction);
+    nsresult FillInDataSourcePath(const nsAString& aDataSourceName, nsIFile ** aLocation);
+    static nsrefcnt gInstanceCount;
+};
+
+#endif /* __nsRssIncomingServer_h */
diff --git a/mailnews/local/src/nsRssService.cpp b/mailnews/local/src/nsRssService.cpp
new file mode 100644
index 000000000..f5caac257
--- /dev/null
+++ b/mailnews/local/src/nsRssService.cpp
@@ -0,0 +1,130 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsRssService.h"
+#include "nsIRssIncomingServer.h"
+#include "nsCOMPtr.h"
+#include "nsIFile.h"
+#include "nsMailDirServiceDefs.h"
+#include "nsIProperties.h"
+#include "nsServiceManagerUtils.h"
+
+nsRssService::nsRssService()
+{
+}
+
+nsRssService::~nsRssService()
+{
+}
+
+NS_IMPL_ISUPPORTS(nsRssService,
+                   nsIRssService,
+                   nsIMsgProtocolInfo)
+                   
+NS_IMETHODIMP nsRssService::GetDefaultLocalPath(nsIFile * *aDefaultLocalPath)
+{
+    NS_ENSURE_ARG_POINTER(aDefaultLocalPath);
+    *aDefaultLocalPath = nullptr;
+    
+    nsCOMPtr<nsIFile> localFile;
+    nsCOMPtr<nsIProperties> dirService(do_GetService("@mozilla.org/file/directory_service;1"));
+    if (!dirService) return NS_ERROR_FAILURE;
+    dirService->Get(NS_APP_MAIL_50_DIR, NS_GET_IID(nsIFile), getter_AddRefs(localFile));
+    if (!localFile) return NS_ERROR_FAILURE;
+
+    bool exists;
+    nsresult rv = localFile->Exists(&exists);
+    if (NS_SUCCEEDED(rv) && !exists)
+        rv = localFile->Create(nsIFile::DIRECTORY_TYPE, 0775);
+    if (NS_FAILED(rv)) return rv;
+   
+    NS_IF_ADDREF(*aDefaultLocalPath = localFile);
+    return NS_OK;
+
+}
+
+NS_IMETHODIMP nsRssService::SetDefaultLocalPath(nsIFile * aDefaultLocalPath)
+{
+    return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP nsRssService::GetServerIID(nsIID * *aServerIID)
+{
+    return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP nsRssService::GetRequiresUsername(bool *aRequiresUsername)
+{
+    NS_ENSURE_ARG_POINTER(aRequiresUsername);
+    *aRequiresUsername = false;
+    return NS_OK;
+}
+
+NS_IMETHODIMP nsRssService::GetPreflightPrettyNameWithEmailAddress(bool *aPreflightPrettyNameWithEmailAddress)
+{
+    return NS_ERROR_NOT_IMPLEMENTED;
+}
+
+NS_IMETHODIMP nsRssService::GetCanDelete(bool *aCanDelete)
+{
+    NS_ENSURE_ARG_POINTER(aCanDelete);
+    *aCanDelete = true;
+    return NS_OK;
+}
+
+NS_IMETHODIMP nsRssService::GetCanLoginAtStartUp(bool *aCanLoginAtStartUp)
+{
+    NS_ENSURE_ARG_POINTER(aCanLoginAtStartUp);
+    *aCanLoginAtStartUp = true;
+    return NS_OK;
+}
+
+NS_IMETHODIMP nsRssService::GetCanDuplicate(bool *aCanDuplicate)
+{
+    NS_ENSURE_ARG_POINTER(aCanDuplicate);
+    *aCanDuplicate = true;
+    return NS_OK;
+}
+
+NS_IMETHODIMP nsRssService::GetDefaultServerPort(bool isSecure, int32_t *_retval)
+{
+    *_retval = -1;
+    return NS_OK;
+}
+
+NS_IMETHODIMP nsRssService::GetCanGetMessages(bool *aCanGetMessages)
+{
+    NS_ENSURE_ARG_POINTER(aCanGetMessages);
+    *aCanGetMessages = true;
+    return NS_OK;
+}
+
+NS_IMETHODIMP nsRssService::GetCanGetIncomingMessages(bool *aCanGetIncomingMessages)
+{
+    NS_ENSURE_ARG_POINTER(aCanGetIncomingMessages);
+    *aCanGetIncomingMessages = true;
+    return NS_OK;
+}
+
+NS_IMETHODIMP nsRssService::GetDefaultDoBiff(bool *aDefaultDoBiff)
+{
+    NS_ENSURE_ARG_POINTER(aDefaultDoBiff);
+    // by default, do biff for RSS feeds
+    *aDefaultDoBiff = true;    
+    return NS_OK;
+}
+
+NS_IMETHODIMP nsRssService::GetShowComposeMsgLink(bool *aShowComposeMsgLink)
+{
+    NS_ENSURE_ARG_POINTER(aShowComposeMsgLink);
+    *aShowComposeMsgLink = false;    
+    return NS_OK;
+}
+
+NS_IMETHODIMP nsRssService::GetFoldersCreatedAsync(bool *aAsyncCreation)
+{
+  NS_ENSURE_ARG_POINTER(aAsyncCreation);
+  *aAsyncCreation = false;
+  return NS_OK;
+}
diff --git a/mailnews/local/src/nsRssService.h b/mailnews/local/src/nsRssService.h
new file mode 100644
index 000000000..45893bba7
--- /dev/null
+++ b/mailnews/local/src/nsRssService.h
@@ -0,0 +1,25 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef nsRssService_h___
+#define nsRssService_h___
+
+#include "nsIRssService.h"
+#include "nsIMsgProtocolInfo.h"
+
+class nsRssService : public nsIMsgProtocolInfo, public nsIRssService
+{
+public:
+
+  nsRssService();
+  
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIRSSSERVICE
+  NS_DECL_NSIMSGPROTOCOLINFO
+
+private:
+  virtual ~nsRssService();
+};
+
+#endif /* nsRssService_h___ */