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

1 files changed, 3400 insertions, 0 deletions

diff --git a/mailnews/imap/src/nsImapService.cpp b/mailnews/imap/src/nsImapService.cpp
new file mode 100644
index 000000000..5e097311e
--- /dev/null
+++ b/mailnews/imap/src/nsImapService.cpp
@@ -0,0 +1,3400 @@
+/* -*- 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 "nsMsgImapCID.h"
+
+#include "netCore.h"
+
+#include "nsIServiceManager.h"
+#include "nsIComponentManager.h"
+
+#include "nsIIMAPHostSessionList.h"
+#include "nsImapService.h"
+
+#include "nsImapUrl.h"
+#include "nsCOMPtr.h"
+#include "nsIMsgFolder.h"
+#include "nsIMsgImapMailFolder.h"
+#include "nsIImapIncomingServer.h"
+#include "nsIImapServerSink.h"
+#include "nsIImapMockChannel.h"
+#include "nsImapUtils.h"
+#include "nsIDocShell.h"
+#include "nsIDocShellLoadInfo.h"
+#include "nsIRDFService.h"
+#include "nsRDFCID.h"
+#include "nsIMsgStatusFeedback.h"
+#include "nsIPrefBranch.h"
+#include "nsIPrefService.h"
+#include "nsILoadGroup.h"
+#include "nsIMsgAccountManager.h"
+#include "nsMsgBaseCID.h"
+#include "nsMsgFolderFlags.h"
+#include "nsISubscribableServer.h"
+#include "nsIDirectoryService.h"
+#include "nsMailDirServiceDefs.h"
+#include "nsIWebNavigation.h"
+#include "nsImapStringBundle.h"
+#include "plbase64.h"
+#include "nsImapOfflineSync.h"
+#include "nsIMsgHdr.h"
+#include "nsMsgUtils.h"
+#include "nsICacheStorage.h"
+#include "nsICacheStorageService.h"
+#include "nsILoadContextInfo.h"
+#include "nsIStreamListenerTee.h"
+#include "nsNetCID.h"
+#include "nsMsgI18N.h"
+#include "nsIOutputStream.h"
+#include "nsIInputStream.h"
+#include "nsISeekableStream.h"
+#include "nsICopyMsgStreamListener.h"
+#include "nsIMsgParseMailMsgState.h"
+#include "nsMsgLocalCID.h"
+#include "nsIOutputStream.h"
+#include "nsIDocShell.h"
+#include "nsIDocShellLoadInfo.h"
+#include "nsIMessengerWindowService.h"
+#include "nsIWindowMediator.h"
+#include "nsIPrompt.h"
+#include "nsIWindowWatcher.h"
+#include "nsImapProtocol.h"
+#include "nsIMsgMailSession.h"
+#include "nsIStreamConverterService.h"
+#include "nsIAutoSyncManager.h"
+#include "nsThreadUtils.h"
+#include "nsNetUtil.h"
+#include "nsMsgMessageFlags.h"
+#include "nsIMsgPluggableStore.h"
+#include "../../base/src/MailnewsLoadContextInfo.h"
+
+#define PREF_MAIL_ROOT_IMAP "mail.root.imap"            // old - for backward compatibility only
+#define PREF_MAIL_ROOT_IMAP_REL "mail.root.imap-rel"
+
+static NS_DEFINE_CID(kImapUrlCID, NS_IMAPURL_CID);
+static NS_DEFINE_CID(kCImapMockChannel, NS_IMAPMOCKCHANNEL_CID);
+
+static const char sequenceString[] = "SEQUENCE";
+static const char uidString[] = "UID";
+
+static bool gInitialized = false;
+static int32_t gMIMEOnDemandThreshold = 15000;
+static bool gMIMEOnDemand = false;
+
+NS_IMPL_ISUPPORTS(nsImapService,
+                   nsIImapService,
+                   nsIMsgMessageService,
+                   nsIProtocolHandler,
+                   nsIMsgProtocolInfo,
+                   nsIMsgMessageFetchPartService,
+                   nsIContentHandler)
+
+nsImapService::nsImapService()
+{
+  mPrintingOperation = false;
+  if (!gInitialized)
+  {
+    nsresult rv;
+    nsCOMPtr<nsIPrefBranch> prefBranch(do_GetService(NS_PREFSERVICE_CONTRACTID, &rv)); 
+    if (NS_SUCCEEDED(rv) && prefBranch) 
+    {
+      prefBranch->GetBoolPref("mail.imap.mime_parts_on_demand", &gMIMEOnDemand);
+      prefBranch->GetIntPref("mail.imap.mime_parts_on_demand_threshold", &gMIMEOnDemandThreshold);
+    }
+
+    // initialize auto-sync service
+    nsCOMPtr<nsIAutoSyncManager> autoSyncMgr = do_GetService(NS_AUTOSYNCMANAGER_CONTRACTID, &rv);
+    if (NS_SUCCEEDED(rv) && autoSyncMgr) 
+    {
+      // auto-sync manager initialization goes here
+      // assign new strategy objects here... 
+    }
+    NS_ASSERTION(autoSyncMgr != nullptr, "*** Cannot initialize nsAutoSyncManager service.");
+
+    gInitialized = true;
+  }
+}
+
+nsImapService::~nsImapService()
+{
+}
+
+char nsImapService::GetHierarchyDelimiter(nsIMsgFolder *aMsgFolder)
+{
+  char delimiter = '/';
+  if (aMsgFolder)
+  {
+    nsCOMPtr<nsIMsgImapMailFolder> imapFolder = do_QueryInterface(aMsgFolder);
+    if (imapFolder)
+      imapFolder->GetHierarchyDelimiter(&delimiter);
+  }
+  return delimiter;
+}
+
+// N.B., this returns an escaped folder name, appropriate for putting in a url.
+nsresult nsImapService::GetFolderName(nsIMsgFolder *aImapFolder, nsACString &aFolderName)
+{
+  nsresult rv;
+  nsCOMPtr<nsIMsgImapMailFolder> aFolder(do_QueryInterface(aImapFolder, &rv));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCString onlineName;
+  // online name is in imap utf-7 - leave it that way
+  rv = aFolder->GetOnlineName(onlineName);
+  NS_ENSURE_SUCCESS(rv, rv);
+  if (onlineName.IsEmpty())
+  {
+    nsCString uri;
+    rv = aImapFolder->GetURI(uri);
+    NS_ENSURE_SUCCESS(rv, rv);
+    nsCString hostname;
+    rv = aImapFolder->GetHostname(hostname);
+    NS_ENSURE_SUCCESS(rv, rv);
+    rv = nsImapURI2FullName(kImapRootURI, hostname.get(), uri.get(), getter_Copies(onlineName));
+  }
+  // if the hierarchy delimiter is not '/', then we want to escape slashes;
+  // otherwise, we do want to escape slashes.
+  // we want to escape slashes and '^' first, otherwise, nsEscape will lose them
+  bool escapeSlashes = (GetHierarchyDelimiter(aImapFolder) != '/');
+  if (escapeSlashes && !onlineName.IsEmpty())
+  {
+    char* escapedOnlineName;
+    rv = nsImapUrl::EscapeSlashes(onlineName.get(), &escapedOnlineName);
+    if (NS_SUCCEEDED(rv))
+      onlineName.Adopt(escapedOnlineName);
+  }
+  // need to escape everything else
+  MsgEscapeString(onlineName, nsINetUtil::ESCAPE_URL_PATH, aFolderName);
+  return rv;
+}
+
+NS_IMETHODIMP nsImapService::SelectFolder(nsIMsgFolder *aImapMailFolder,
+                                          nsIUrlListener *aUrlListener,
+                                          nsIMsgWindow *aMsgWindow,
+                                          nsIURI **aURL)
+{
+  NS_ENSURE_ARG_POINTER(aImapMailFolder);
+
+  if (WeAreOffline())
+    return NS_MSG_ERROR_OFFLINE;
+
+  bool canOpenThisFolder = true;
+  nsCOMPtr<nsIMsgImapMailFolder> imapFolder = do_QueryInterface(aImapMailFolder);
+  if (imapFolder)
+    imapFolder->GetCanOpenFolder(&canOpenThisFolder);
+
+  if (!canOpenThisFolder) 
+    return NS_OK;
+
+  nsresult rv;
+  nsCOMPtr<nsIImapUrl> imapUrl;
+  nsAutoCString urlSpec;
+  char hierarchyDelimiter = GetHierarchyDelimiter(aImapMailFolder);
+  rv = CreateStartOfImapUrl(EmptyCString(), getter_AddRefs(imapUrl),
+                            aImapMailFolder, aUrlListener, urlSpec, hierarchyDelimiter);
+
+  if (NS_SUCCEEDED(rv) && imapUrl)
+  {
+    // nsImapUrl::SetSpec() will set the imap action properly
+    rv = imapUrl->SetImapAction(nsIImapUrl::nsImapSelectFolder);
+
+    nsCOMPtr<nsIMsgMailNewsUrl> mailNewsUrl = do_QueryInterface(imapUrl);
+    // if no msg window, we won't put up error messages (this is almost certainly a biff-inspired get new msgs)
+    if (!aMsgWindow)
+      mailNewsUrl->SetSuppressErrorMsgs(true);
+    mailNewsUrl->SetMsgWindow(aMsgWindow);
+    mailNewsUrl->SetUpdatingFolder(true);
+    rv = SetImapUrlSink(aImapMailFolder, imapUrl);
+
+    if (NS_SUCCEEDED(rv))
+    {
+      nsAutoCString folderName;
+      GetFolderName(aImapMailFolder, folderName);
+      urlSpec.Append("/select>");
+      urlSpec.Append(hierarchyDelimiter);
+      urlSpec.Append(folderName);
+      rv = mailNewsUrl->SetSpec(urlSpec);
+      if (NS_SUCCEEDED(rv))
+        rv = GetImapConnectionAndLoadUrl(imapUrl, nullptr, aURL);
+    }
+  } // if we have a url to run....
+
+  return rv;
+}
+
+// lite select, used to verify UIDVALIDITY while going on/offline
+NS_IMETHODIMP nsImapService::LiteSelectFolder(nsIMsgFolder *aImapMailFolder,
+                                              nsIUrlListener *aUrlListener,
+                                              nsIMsgWindow *aMsgWindow,
+                                              nsIURI **aURL)
+{
+  NS_ENSURE_ARG_POINTER(aImapMailFolder);
+
+  return FolderCommand(aImapMailFolder, aUrlListener,
+                       "/liteselect>", nsIImapUrl::nsImapLiteSelectFolder, aMsgWindow, aURL);
+}
+
+NS_IMETHODIMP nsImapService::GetUrlForUri(const char *aMessageURI, 
+                                          nsIURI **aURL, 
+                                          nsIMsgWindow *aMsgWindow) 
+{
+  nsAutoCString messageURI(aMessageURI);
+
+  if (messageURI.Find(NS_LITERAL_CSTRING("&type=application/x-message-display")) != kNotFound)
+    return NS_NewURI(aURL, aMessageURI);
+
+  nsCOMPtr<nsIMsgFolder> folder;
+  nsAutoCString msgKey;
+  nsresult rv = DecomposeImapURI(messageURI, getter_AddRefs(folder), msgKey);
+  if (NS_SUCCEEDED(rv))
+  {
+    nsCOMPtr<nsIImapUrl> imapUrl;
+    nsAutoCString urlSpec;
+    char hierarchyDelimiter = GetHierarchyDelimiter(folder);
+    rv = CreateStartOfImapUrl(messageURI, getter_AddRefs(imapUrl), folder, nullptr, urlSpec, hierarchyDelimiter);
+    NS_ENSURE_SUCCESS(rv, rv);
+    rv = SetImapUrlSink(folder, imapUrl);
+    NS_ENSURE_SUCCESS(rv, rv);
+    nsCOMPtr <nsIMsgMailNewsUrl> mailnewsUrl = do_QueryInterface(imapUrl);
+    bool useLocalCache = false;
+    folder->HasMsgOffline(strtoul(msgKey.get(), nullptr, 10), &useLocalCache);
+    mailnewsUrl->SetMsgIsInLocalCache(useLocalCache);
+
+    nsCOMPtr<nsIURI> url = do_QueryInterface(imapUrl);
+    rv = url->GetSpec(urlSpec);
+    NS_ENSURE_SUCCESS(rv, rv);
+    urlSpec.Append("fetch>UID>");
+    urlSpec.Append(hierarchyDelimiter);
+
+    nsAutoCString folderName;
+    GetFolderName(folder, folderName);
+    urlSpec.Append(folderName);
+    urlSpec.Append(">");
+    urlSpec.Append(msgKey);
+    rv = url->SetSpec(urlSpec);
+    imapUrl->QueryInterface(NS_GET_IID(nsIURI), (void **) aURL);
+  }
+
+  return rv;
+}
+
+NS_IMETHODIMP nsImapService::OpenAttachment(const char *aContentType, 
+                                            const char *aFileName,
+                                            const char *aUrl, 
+                                            const char *aMessageUri, 
+                                            nsISupports *aDisplayConsumer, 
+                                            nsIMsgWindow *aMsgWindow, 
+                                            nsIUrlListener *aUrlListener)
+{
+  // okay this is a little tricky....we may have to fetch the mime part
+  // or it may already be downloaded for us....the only way i can tell to 
+  // distinguish the two events is to search for ?section or ?part
+  
+  nsAutoCString uri(aMessageUri);
+  nsAutoCString urlString(aUrl);
+  MsgReplaceSubstring(urlString, "/;section", "?section");
+  
+  // more stuff i don't understand
+  int32_t sectionPos = urlString.Find("?section");
+  // if we have a section field then we must be dealing with a mime part we need to fetchf
+  if (sectionPos > 0)
+  {
+    uri.Append(Substring(urlString, sectionPos));
+    uri += "&type=";
+    uri += aContentType;
+    uri += "&filename=";
+    uri += aFileName;
+  }
+  else
+  {
+    // try to extract the specific part number out from the url string
+    const char *partStart = PL_strstr(aUrl, "part=");
+    if (!partStart)
+      return NS_ERROR_FAILURE;
+    nsDependentCString part(partStart);
+    uri += "?";
+    uri += Substring(part, 0, part.FindChar('&'));
+    uri += "&type=";
+    uri += aContentType;
+    uri += "&filename=";
+    uri += aFileName;
+  }
+
+  nsCOMPtr<nsIMsgFolder> folder;
+  nsAutoCString msgKey;
+  nsAutoCString uriMimePart;
+  nsAutoCString folderURI;
+  nsMsgKey key;
+
+  nsresult rv = DecomposeImapURI(uri, getter_AddRefs(folder), msgKey);
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = nsParseImapMessageURI(uri.get(), folderURI, &key, getter_Copies(uriMimePart));
+  if (NS_SUCCEEDED(rv))
+  {
+    nsCOMPtr<nsIImapMessageSink> imapMessageSink(do_QueryInterface(folder, &rv));
+    if (NS_SUCCEEDED(rv))
+    {
+      nsCOMPtr<nsIImapUrl> imapUrl;
+      nsAutoCString urlSpec;
+      char hierarchyDelimiter = GetHierarchyDelimiter(folder);
+      rv = CreateStartOfImapUrl(uri, getter_AddRefs(imapUrl), folder, aUrlListener, urlSpec, hierarchyDelimiter);
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      urlSpec.Append("/fetch>UID>");
+      urlSpec.Append(hierarchyDelimiter);
+
+      nsCString folderName;
+      GetFolderName(folder, folderName);
+      urlSpec.Append(folderName);
+      urlSpec.Append(">");
+      urlSpec.Append(msgKey);
+      urlSpec.Append(uriMimePart);
+
+      if (!uriMimePart.IsEmpty())
+      {
+        nsCOMPtr<nsIMsgMailNewsUrl> mailUrl (do_QueryInterface(imapUrl));
+        if (mailUrl)
+        {
+          rv = mailUrl->SetSpec(urlSpec);
+          NS_ENSURE_SUCCESS(rv, rv);
+          if (aFileName)
+            mailUrl->SetFileName(nsDependentCString(aFileName));
+        }
+        rv =  FetchMimePart(imapUrl, nsIImapUrl::nsImapOpenMimePart, folder, imapMessageSink,
+                            nullptr, aDisplayConsumer, msgKey, uriMimePart);
+      }
+    } // if we got a message sink
+  } // if we parsed the message uri
+
+  return rv;
+}
+
+NS_IMETHODIMP nsImapService::FetchMimePart(nsIURI *aURI, 
+                                           const char *aMessageURI, 
+                                           nsISupports *aDisplayConsumer, 
+                                           nsIMsgWindow *aMsgWindow, 
+                                           nsIUrlListener *aUrlListener, 
+                                           nsIURI **aURL)
+{
+  nsCOMPtr<nsIMsgFolder> folder;
+  nsAutoCString messageURI(aMessageURI);
+  nsAutoCString msgKey;
+  nsAutoCString mimePart;
+  nsAutoCString folderURI;
+  nsMsgKey key;
+  
+  nsresult rv = DecomposeImapURI(messageURI, getter_AddRefs(folder), msgKey);
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = nsParseImapMessageURI(aMessageURI, folderURI, &key, getter_Copies(mimePart));
+  if (NS_SUCCEEDED(rv))
+  {
+    nsCOMPtr<nsIImapMessageSink> imapMessageSink(do_QueryInterface(folder, &rv));
+    if (NS_SUCCEEDED(rv))
+    {
+      nsCOMPtr<nsIImapUrl> imapUrl = do_QueryInterface(aURI);
+      nsCOMPtr<nsIMsgMailNewsUrl> msgurl (do_QueryInterface(aURI));
+      
+      msgurl->SetMsgWindow(aMsgWindow);
+      msgurl->RegisterListener(aUrlListener);
+      
+      if (!mimePart.IsEmpty())
+      {
+        return FetchMimePart(imapUrl, nsIImapUrl::nsImapMsgFetch, folder, imapMessageSink,
+          aURL, aDisplayConsumer, msgKey, mimePart);
+      }
+    }
+  }
+  return rv;
+}
+
+NS_IMETHODIMP nsImapService::DisplayMessage(const char *aMessageURI,
+                                            nsISupports *aDisplayConsumer,  
+                                            nsIMsgWindow *aMsgWindow,
+                                            nsIUrlListener *aUrlListener,
+                                            const char *aCharsetOverride,
+                                            nsIURI **aURL)
+{
+  nsresult rv;
+
+  nsCOMPtr<nsIMsgFolder> folder;
+  nsAutoCString msgKey;
+  nsAutoCString mimePart;
+  nsAutoCString folderURI;
+  nsMsgKey key;
+  nsAutoCString messageURI(aMessageURI);
+
+  int32_t typeIndex = messageURI.Find("&type=application/x-message-display");
+  if (typeIndex != kNotFound)
+  {
+    // This happens with forward inline of a message/rfc822 attachment opened in
+    // a standalone msg window.
+    // So, just cut to the chase and call AsyncOpen on a channel.
+    nsCOMPtr <nsIURI> uri;
+    messageURI.Cut(typeIndex, sizeof("&type=application/x-message-display") - 1);
+    rv = NS_NewURI(getter_AddRefs(uri), messageURI.get());
+    NS_ENSURE_SUCCESS(rv, rv);
+    if (aURL)
+      NS_IF_ADDREF(*aURL = uri);
+    nsCOMPtr<nsIStreamListener> aStreamListener = do_QueryInterface(aDisplayConsumer, &rv);
+    if (NS_SUCCEEDED(rv) && aStreamListener)
+    {
+      nsCOMPtr<nsIChannel> aChannel;
+      nsCOMPtr<nsILoadGroup> aLoadGroup;
+      nsCOMPtr<nsIMsgMailNewsUrl> mailnewsUrl = do_QueryInterface(uri, &rv);
+      if (NS_SUCCEEDED(rv) && mailnewsUrl)
+        mailnewsUrl->GetLoadGroup(getter_AddRefs(aLoadGroup));
+
+      rv = NewChannel(uri, getter_AddRefs(aChannel));
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      nsCOMPtr<nsISupports> aCtxt = do_QueryInterface(uri);
+      //  now try to open the channel passing in our display consumer as the listener
+      rv = aChannel->AsyncOpen(aStreamListener, aCtxt);
+      return rv;
+    }
+  }
+
+  rv = DecomposeImapURI(messageURI, getter_AddRefs(folder), msgKey);
+  NS_ENSURE_SUCCESS(rv, rv);
+  if (msgKey.IsEmpty())
+    return NS_MSG_MESSAGE_NOT_FOUND;
+
+  rv = nsParseImapMessageURI(aMessageURI, folderURI, &key, getter_Copies(mimePart));
+  if (NS_SUCCEEDED(rv))
+  {
+    nsCOMPtr<nsIImapMessageSink> imapMessageSink(do_QueryInterface(folder, &rv));
+    if (NS_SUCCEEDED(rv))
+    {
+      nsCOMPtr<nsIImapUrl> imapUrl;
+      nsAutoCString urlSpec;
+      char hierarchyDelimiter = GetHierarchyDelimiter(folder);
+      rv = CreateStartOfImapUrl(messageURI, getter_AddRefs(imapUrl), folder, aUrlListener, urlSpec, hierarchyDelimiter);
+      NS_ENSURE_SUCCESS(rv, rv);
+      if (!mimePart.IsEmpty())
+      {
+        nsresult rv;
+        nsCOMPtr<nsIURI> url = do_QueryInterface(imapUrl);
+
+        rv = AddImapFetchToUrl(url, folder, msgKey + mimePart, EmptyCString());
+        NS_ENSURE_SUCCESS(rv, rv);
+
+        return FetchMimePart(imapUrl, nsIImapUrl::nsImapMsgFetch, folder, imapMessageSink,
+                             aURL, aDisplayConsumer, msgKey, mimePart);
+      }
+
+      nsCOMPtr<nsIMsgMailNewsUrl> msgurl (do_QueryInterface(imapUrl));
+      nsCOMPtr<nsIMsgI18NUrl> i18nurl (do_QueryInterface(imapUrl));
+      i18nurl->SetCharsetOverRide(aCharsetOverride);
+
+      uint32_t messageSize;
+      bool useMimePartsOnDemand = gMIMEOnDemand;
+      bool shouldStoreMsgOffline = false;
+      bool hasMsgOffline = false;
+
+      nsCOMPtr<nsIMsgIncomingServer> aMsgIncomingServer;
+
+      if (imapMessageSink)
+        imapMessageSink->GetMessageSizeFromDB(msgKey.get(), &messageSize);
+
+      msgurl->SetMsgWindow(aMsgWindow);
+
+      rv = msgurl->GetServer(getter_AddRefs(aMsgIncomingServer));
+
+      if (NS_SUCCEEDED(rv) && aMsgIncomingServer)
+      {
+        nsCOMPtr<nsIImapIncomingServer> aImapServer(do_QueryInterface(aMsgIncomingServer, &rv));
+        if (NS_SUCCEEDED(rv) && aImapServer)
+          aImapServer->GetMimePartsOnDemand(&useMimePartsOnDemand);
+      }
+
+      nsAutoCString uriStr(aMessageURI);
+      int32_t keySeparator = uriStr.RFindChar('#');
+      if(keySeparator != -1)
+      {
+        int32_t keyEndSeparator = MsgFindCharInSet(uriStr, "/?&", keySeparator);
+        int32_t mpodFetchPos = MsgFind(uriStr, "fetchCompleteMessage=true", false, keyEndSeparator);
+        if (mpodFetchPos != -1)
+          useMimePartsOnDemand = false;
+      }
+
+      if (folder)
+      {
+        folder->ShouldStoreMsgOffline(key, &shouldStoreMsgOffline);
+        folder->HasMsgOffline(key, &hasMsgOffline);
+      }
+      imapUrl->SetStoreResultsOffline(shouldStoreMsgOffline);
+      imapUrl->SetFetchPartsOnDemand(
+        useMimePartsOnDemand && messageSize >= (uint32_t) gMIMEOnDemandThreshold);
+
+      if (hasMsgOffline)
+        msgurl->SetMsgIsInLocalCache(true);
+
+      nsCOMPtr<nsIPrefBranch> prefBranch(do_GetService(NS_PREFSERVICE_CONTRACTID, &rv));
+      // Should the message fetch force a peek or a traditional fetch?
+      // Force peek if there is a delay in marking read (or no auto-marking at all).
+      // This is because a FETCH (BODY[]) will implicitly set tha \Seen flag on the msg,
+      // but a FETCH (BODY.PEEK[]) won't.
+      bool forcePeek = false;
+      if (NS_SUCCEEDED(rv) && prefBranch)
+      {
+        int32_t dontMarkAsReadPos = uriStr.Find("&markRead=false");
+        bool markReadAuto = true;
+        prefBranch->GetBoolPref("mailnews.mark_message_read.auto", &markReadAuto);
+        bool markReadDelay = false;
+        prefBranch->GetBoolPref("mailnews.mark_message_read.delay", &markReadDelay);
+        forcePeek = (!markReadAuto || markReadDelay || (dontMarkAsReadPos != kNotFound));
+      }
+
+      rv = FetchMessage(imapUrl, forcePeek ? nsIImapUrl::nsImapMsgFetchPeek : nsIImapUrl::nsImapMsgFetch, 
+                        folder, imapMessageSink, aMsgWindow, aDisplayConsumer, msgKey, false, 
+                        (mPrintingOperation) ? NS_LITERAL_CSTRING("print") : NS_LITERAL_CSTRING(""), aURL);
+    }
+  }
+  return rv;
+}
+
+
+nsresult nsImapService::FetchMimePart(nsIImapUrl *aImapUrl,
+                                      nsImapAction aImapAction,
+                                      nsIMsgFolder *aImapMailFolder, 
+                                      nsIImapMessageSink *aImapMessage,
+                                      nsIURI **aURL,
+                                      nsISupports *aDisplayConsumer, 
+                                      const nsACString &messageIdentifierList,
+                                      const nsACString &mimePart) 
+{
+  NS_ENSURE_ARG_POINTER(aImapUrl);
+  NS_ENSURE_ARG_POINTER(aImapMailFolder);
+  NS_ENSURE_ARG_POINTER(aImapMessage);
+
+  // create a protocol instance to handle the request.
+  // NOTE: once we start working with multiple connections, this step will be much more complicated...but for now
+  // just create a connection and process the request.
+  nsAutoCString urlSpec;
+  nsresult rv = SetImapUrlSink(aImapMailFolder, aImapUrl);
+  nsImapAction actionToUse = aImapAction;
+  if (actionToUse == nsImapUrl::nsImapOpenMimePart)
+    actionToUse = nsIImapUrl::nsImapMsgFetch;
+
+  nsCOMPtr<nsIMsgMailNewsUrl> msgurl (do_QueryInterface(aImapUrl));
+  if (aImapMailFolder && msgurl && !messageIdentifierList.IsEmpty())
+  {
+    bool useLocalCache = false;
+    aImapMailFolder->HasMsgOffline(strtoul(nsCString(messageIdentifierList).get(), nullptr, 10),
+                                   &useLocalCache);
+    msgurl->SetMsgIsInLocalCache(useLocalCache);
+  }
+  rv = aImapUrl->SetImapMessageSink(aImapMessage);
+  if (NS_SUCCEEDED(rv))
+  {
+    nsCOMPtr<nsIURI> url = do_QueryInterface(aImapUrl);
+    if (aURL)
+      NS_IF_ADDREF(*aURL = url);
+
+    rv = url->GetSpec(urlSpec);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    // rhp: If we are displaying this message for the purpose of printing, we
+    // need to append the header=print option.
+    //
+    if (mPrintingOperation)
+      urlSpec.Append("?header=print");
+
+    rv = url->SetSpec(urlSpec);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    rv = aImapUrl->SetImapAction(actionToUse /* nsIImapUrl::nsImapMsgFetch */);
+    if (aImapMailFolder && aDisplayConsumer)
+    {
+      nsCOMPtr<nsIMsgIncomingServer> aMsgIncomingServer;
+      rv = aImapMailFolder->GetServer(getter_AddRefs(aMsgIncomingServer));
+      if (NS_SUCCEEDED(rv) && aMsgIncomingServer)
+      {
+        bool interrupted;
+        nsCOMPtr<nsIImapIncomingServer>
+          aImapServer(do_QueryInterface(aMsgIncomingServer, &rv));
+        if (NS_SUCCEEDED(rv) && aImapServer)
+          aImapServer->PseudoInterruptMsgLoad(aImapMailFolder, nullptr, &interrupted);
+      }
+    }
+    // if the display consumer is a docshell, then we should run the url in the docshell.
+    // otherwise, it should be a stream listener....so open a channel using AsyncRead
+    // and the provided stream listener....
+    
+    nsCOMPtr<nsIDocShell> docShell(do_QueryInterface(aDisplayConsumer, &rv));
+    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 (aImapAction == nsImapUrl::nsImapOpenMimePart)
+      {
+        docShell->CreateLoadInfo(getter_AddRefs(loadInfo));
+        loadInfo->SetLoadType(nsIDocShellLoadInfo::loadLink);
+      }
+      
+      rv = docShell->LoadURI(url, loadInfo, nsIWebNavigation::LOAD_FLAGS_NONE, false);
+    }
+    else
+    {
+      nsCOMPtr<nsIStreamListener> aStreamListener = do_QueryInterface(aDisplayConsumer, &rv);
+      if (NS_SUCCEEDED(rv) && aStreamListener)
+      {
+        nsCOMPtr<nsIChannel> aChannel;
+        nsCOMPtr<nsILoadGroup> loadGroup;
+        nsCOMPtr<nsIMsgMailNewsUrl> mailnewsUrl = do_QueryInterface(aImapUrl, &rv);
+        if (NS_SUCCEEDED(rv) && mailnewsUrl)
+          mailnewsUrl->GetLoadGroup(getter_AddRefs(loadGroup));
+        
+        rv = NewChannel(url, getter_AddRefs(aChannel));
+        NS_ENSURE_SUCCESS(rv, rv);
+        
+        // we need a load group to hold onto the channel. When the request is finished,
+        // it'll get removed from the load group, and the channel will go away,
+        // which will free the load group.
+        if (!loadGroup)
+          loadGroup = do_CreateInstance(NS_LOADGROUP_CONTRACTID);
+
+        aChannel->SetLoadGroup(loadGroup);
+
+        nsCOMPtr<nsISupports> aCtxt = do_QueryInterface(url);
+        //  now try to open the channel passing in our display consumer as the listener
+        rv = aChannel->AsyncOpen(aStreamListener, aCtxt);
+      }
+      else // do what we used to do before
+      {
+        // I'd like to get rid of this code as I believe that we always get a docshell
+        // or stream listener passed into us in this method but i'm not sure yet...
+        // I'm going to use an assert for now to figure out if this is ever getting called
+#if defined(DEBUG_mscott) || defined(DEBUG_bienvenu)
+        NS_ERROR("oops...someone still is reaching this part of the code");
+#endif
+        rv = GetImapConnectionAndLoadUrl(aImapUrl, aDisplayConsumer, aURL);
+      }
+    }
+  }
+  return rv;
+}
+
+//
+// rhp: Right now, this is the same as simple DisplayMessage, but it will change
+// to support print rendering.
+//
+NS_IMETHODIMP nsImapService::DisplayMessageForPrinting(const char *aMessageURI,
+                                                       nsISupports *aDisplayConsumer,  
+                                                       nsIMsgWindow *aMsgWindow,
+                                                       nsIUrlListener *aUrlListener,
+                                                       nsIURI **aURL) 
+{
+  mPrintingOperation = true;
+  nsresult rv = DisplayMessage(aMessageURI, aDisplayConsumer, aMsgWindow, aUrlListener, nullptr, aURL);
+  mPrintingOperation = false;
+  return rv;
+}
+
+NS_IMETHODIMP nsImapService::CopyMessage(const char *aSrcMailboxURI, 
+                                         nsIStreamListener *aMailboxCopy, 
+                                         bool moveMessage,
+                                         nsIUrlListener *aUrlListener, 
+                                         nsIMsgWindow *aMsgWindow, 
+                                         nsIURI **aURL)
+{
+  NS_ENSURE_ARG_POINTER(aSrcMailboxURI);
+  NS_ENSURE_ARG_POINTER(aMailboxCopy);
+  
+  nsresult rv;
+  nsCOMPtr<nsISupports> streamSupport;
+  streamSupport = do_QueryInterface(aMailboxCopy, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+  
+  nsCOMPtr<nsIMsgFolder> folder;
+  nsAutoCString msgKey;
+  rv = DecomposeImapURI(nsDependentCString(aSrcMailboxURI), getter_AddRefs(folder), msgKey);
+  if (NS_SUCCEEDED(rv))
+  {
+    nsCOMPtr<nsIImapMessageSink> imapMessageSink(do_QueryInterface(folder, &rv));
+    if (NS_SUCCEEDED(rv))
+    {
+      nsCOMPtr<nsIImapUrl> imapUrl;
+      nsAutoCString urlSpec;
+      char hierarchyDelimiter = GetHierarchyDelimiter(folder);
+      bool hasMsgOffline = false;
+      nsMsgKey key = strtoul(msgKey.get(), nullptr, 10);
+
+      rv = CreateStartOfImapUrl(nsDependentCString(aSrcMailboxURI), getter_AddRefs(imapUrl),
+                                folder, aUrlListener, urlSpec, hierarchyDelimiter);
+      if (folder)
+      {
+        nsCOMPtr<nsIMsgMailNewsUrl> msgurl (do_QueryInterface(imapUrl));
+        folder->HasMsgOffline(key, &hasMsgOffline);
+        if (msgurl)
+          msgurl->SetMsgIsInLocalCache(hasMsgOffline);
+      }
+      // now try to download the message
+      nsImapAction imapAction = nsIImapUrl::nsImapOnlineToOfflineCopy;
+      if (moveMessage)
+        imapAction = nsIImapUrl::nsImapOnlineToOfflineMove; 
+      rv = FetchMessage(imapUrl,imapAction, folder, imapMessageSink,aMsgWindow, 
+                        streamSupport, msgKey, false, EmptyCString(), aURL);
+    } // if we got an imap message sink
+  } // if we decomposed the imap message 
+  return rv;
+}
+
+NS_IMETHODIMP nsImapService::CopyMessages(uint32_t aNumKeys,
+                                          nsMsgKey*aKeys,
+                                          nsIMsgFolder *srcFolder,
+                                          nsIStreamListener *aMailboxCopy,
+                                          bool moveMessage,
+                                          nsIUrlListener *aUrlListener,
+                                          nsIMsgWindow *aMsgWindow, 
+                                          nsIURI **aURL)
+{
+  NS_ENSURE_ARG_POINTER(aMailboxCopy);
+  NS_ENSURE_ARG_POINTER(aKeys);
+
+  nsresult rv;
+  nsCOMPtr<nsISupports> streamSupport = do_QueryInterface(aMailboxCopy, &rv);
+  if (!streamSupport || NS_FAILED(rv)) 
+    return rv;
+  
+  nsCOMPtr<nsIMsgFolder> folder = srcFolder;
+  if (NS_SUCCEEDED(rv))
+  {
+    nsCOMPtr<nsIImapMessageSink> imapMessageSink(do_QueryInterface(folder, &rv));
+    if (NS_SUCCEEDED(rv))
+    {
+      // we generate the uri for the first message so that way on down the line,
+      // GetMessage in nsCopyMessageStreamListener will get an unescaped username
+      // and be able to find the msg hdr. See bug 259656 for details
+      nsCString uri;
+      srcFolder->GenerateMessageURI(aKeys[0], uri);
+
+      nsCString messageIds;
+      AllocateImapUidString(aKeys, aNumKeys, nullptr, messageIds);
+      nsCOMPtr<nsIImapUrl> imapUrl;
+      nsAutoCString urlSpec;
+      char hierarchyDelimiter = GetHierarchyDelimiter(folder);
+      rv = CreateStartOfImapUrl(uri, getter_AddRefs(imapUrl), folder, aUrlListener, urlSpec, hierarchyDelimiter);
+      nsImapAction action;
+      if (moveMessage) // don't use ?: syntax here, it seems to break the Mac.
+        action = nsIImapUrl::nsImapOnlineToOfflineMove;
+      else
+        action = nsIImapUrl::nsImapOnlineToOfflineCopy;
+      imapUrl->SetCopyState(aMailboxCopy);
+      // now try to display the message
+      rv = FetchMessage(imapUrl, action, folder, imapMessageSink, aMsgWindow, 
+                        streamSupport, messageIds, false, EmptyCString(), aURL);
+      // ### end of copy operation should know how to do the delete.if this is a move
+      
+    } // if we got an imap message sink
+  } // if we decomposed the imap message 
+  return rv;
+}
+
+NS_IMETHODIMP nsImapService::Search(nsIMsgSearchSession *aSearchSession, 
+                                    nsIMsgWindow *aMsgWindow, 
+                                    nsIMsgFolder *aMsgFolder, 
+                                    const char *aSearchUri)
+{
+  NS_ENSURE_ARG_POINTER(aSearchUri);
+  NS_ENSURE_ARG_POINTER(aMsgFolder);
+  nsresult rv;
+
+  nsCOMPtr<nsIImapUrl> imapUrl;
+  nsCOMPtr <nsIUrlListener> urlListener = do_QueryInterface(aSearchSession, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsAutoCString urlSpec;
+  char hierarchyDelimiter = GetHierarchyDelimiter(aMsgFolder);
+  rv = CreateStartOfImapUrl(EmptyCString(), getter_AddRefs(imapUrl),
+                            aMsgFolder, urlListener, urlSpec,
+                            hierarchyDelimiter);
+  NS_ENSURE_SUCCESS(rv, rv);
+  nsCOMPtr<nsIMsgMailNewsUrl> msgurl (do_QueryInterface(imapUrl));
+
+  msgurl->SetMsgWindow(aMsgWindow);
+  msgurl->SetSearchSession(aSearchSession);
+  rv = SetImapUrlSink(aMsgFolder, imapUrl);
+
+  if (NS_SUCCEEDED(rv))
+  {
+    nsCString folderName;
+    GetFolderName(aMsgFolder, folderName);
+
+    nsCOMPtr <nsIMsgMailNewsUrl> mailNewsUrl = do_QueryInterface(imapUrl);
+    if (!aMsgWindow)
+      mailNewsUrl->SetSuppressErrorMsgs(true);
+
+    urlSpec.Append("/search>UID>");
+    urlSpec.Append(hierarchyDelimiter);
+    urlSpec.Append(folderName);
+    urlSpec.Append('>');
+    // escape aSearchUri so that IMAP special characters (i.e. '\')
+    // won't be replaced with '/' in NECKO.
+    // it will be unescaped in nsImapUrl::ParseUrl().
+    nsCString escapedSearchUri;
+
+    MsgEscapeString(nsDependentCString(aSearchUri), nsINetUtil::ESCAPE_XALPHAS, escapedSearchUri);
+    urlSpec.Append(escapedSearchUri);
+    rv = mailNewsUrl->SetSpec(urlSpec);
+    if (NS_SUCCEEDED(rv))
+      rv = GetImapConnectionAndLoadUrl(imapUrl, nullptr, nullptr);
+  }
+  return rv;
+}
+
+// just a helper method to break down imap message URIs....
+nsresult nsImapService::DecomposeImapURI(const nsACString &aMessageURI,
+                                         nsIMsgFolder **aFolder,
+                                         nsACString &aMsgKey)
+{
+  nsMsgKey msgKey;
+  nsresult rv = DecomposeImapURI(aMessageURI, aFolder, &msgKey);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  if (msgKey)
+  {
+    nsAutoCString messageIdString;
+    messageIdString.AppendInt(msgKey);
+    aMsgKey = messageIdString;
+  }
+
+  return rv;
+}
+
+// just a helper method to break down imap message URIs....
+nsresult nsImapService::DecomposeImapURI(const nsACString &aMessageURI,
+                                         nsIMsgFolder **aFolder,
+                                         nsMsgKey *aMsgKey)
+{
+  NS_ENSURE_ARG_POINTER(aFolder);
+  NS_ENSURE_ARG_POINTER(aMsgKey);
+
+  nsAutoCString folderURI;
+  nsresult rv = nsParseImapMessageURI(PromiseFlatCString(aMessageURI).get(),
+                                      folderURI, aMsgKey, nullptr);
+  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);
+
+  nsCOMPtr<nsIMsgFolder> msgFolder = do_QueryInterface(res);
+  NS_ENSURE_TRUE(msgFolder, NS_ERROR_FAILURE);
+
+  msgFolder.swap(*aFolder);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsImapService::SaveMessageToDisk(const char *aMessageURI,
+                                               nsIFile *aFile,
+                                               bool aAddDummyEnvelope,
+                                               nsIUrlListener *aUrlListener,
+                                               nsIURI **aURL,
+                                               bool canonicalLineEnding,
+                                               nsIMsgWindow *aMsgWindow)
+{
+  nsCOMPtr<nsIMsgFolder> folder;
+  nsCOMPtr<nsIImapUrl> imapUrl;
+  nsAutoCString msgKey;
+
+  nsresult rv = DecomposeImapURI(nsDependentCString(aMessageURI),
+                                 getter_AddRefs(folder), msgKey);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  bool hasMsgOffline = false;
+
+  if (folder)
+    folder->HasMsgOffline(strtoul(msgKey.get(), nullptr, 10), &hasMsgOffline);
+
+  nsAutoCString urlSpec;
+  char hierarchyDelimiter = GetHierarchyDelimiter(folder);
+  rv = CreateStartOfImapUrl(nsDependentCString(aMessageURI), getter_AddRefs(imapUrl), 
+                            folder, aUrlListener, urlSpec, hierarchyDelimiter);
+  if (NS_SUCCEEDED(rv)) 
+  {
+    nsCOMPtr<nsIImapMessageSink> imapMessageSink(do_QueryInterface(folder, &rv));
+    NS_ENSURE_SUCCESS(rv, rv);  
+    nsCOMPtr<nsIMsgMessageUrl> msgUrl = do_QueryInterface(imapUrl, &rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+    msgUrl->SetMessageFile(aFile);
+    msgUrl->SetAddDummyEnvelope(aAddDummyEnvelope);
+    msgUrl->SetCanonicalLineEnding(canonicalLineEnding);
+
+    nsCOMPtr <nsIMsgMailNewsUrl> mailnewsUrl = do_QueryInterface(msgUrl);
+    if (mailnewsUrl)
+      mailnewsUrl->SetMsgIsInLocalCache(hasMsgOffline);
+
+    nsCOMPtr <nsIStreamListener> saveAsListener;
+    mailnewsUrl->GetSaveAsListener(aAddDummyEnvelope, aFile, getter_AddRefs(saveAsListener));
+
+    return FetchMessage(imapUrl, nsIImapUrl::nsImapSaveMessageToDisk, folder, imapMessageSink, 
+                        aMsgWindow, saveAsListener, msgKey, false, EmptyCString(), aURL);
+  }
+  return rv;
+}
+
+/* fetching RFC822 messages */
+/* imap4://HOST>fetch><UID>>MAILBOXPATH>x */
+/*   'x' is the message UID */
+/* will set the 'SEEN' flag */
+NS_IMETHODIMP nsImapService::AddImapFetchToUrl(nsIURI *aUrl,
+                                               nsIMsgFolder *aImapMailFolder,
+                                               const nsACString &aMessageIdentifierList,
+                                               const nsACString &aAdditionalHeader)
+{
+  NS_ENSURE_ARG_POINTER(aUrl);
+
+  nsAutoCString urlSpec;
+  nsresult rv = aUrl->GetSpec(urlSpec);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  char hierarchyDelimiter = GetHierarchyDelimiter(aImapMailFolder);
+
+  urlSpec.Append("fetch>UID>");
+  urlSpec.Append(hierarchyDelimiter);
+
+  nsAutoCString folderName;
+  GetFolderName(aImapMailFolder, folderName);
+  urlSpec.Append(folderName);
+
+  urlSpec.Append(">");
+  urlSpec.Append(aMessageIdentifierList);
+
+  if (!aAdditionalHeader.IsEmpty())
+  {
+    urlSpec.Append("?header=");
+    urlSpec.Append(aAdditionalHeader);
+  }
+
+  return aUrl->SetSpec(urlSpec);
+}
+
+NS_IMETHODIMP nsImapService::FetchMessage(nsIImapUrl *aImapUrl,
+                                          nsImapAction aImapAction,
+                                          nsIMsgFolder *aImapMailFolder, 
+                                          nsIImapMessageSink *aImapMessage,
+                                          nsIMsgWindow *aMsgWindow,
+                                          nsISupports *aDisplayConsumer, 
+                                          const nsACString &messageIdentifierList,
+                                          bool aConvertDataToText,
+                                          const nsACString &aAdditionalHeader,
+                                          nsIURI **aURL)
+{
+  NS_ENSURE_ARG_POINTER(aImapUrl);
+  NS_ENSURE_ARG_POINTER(aImapMailFolder);
+  NS_ENSURE_ARG_POINTER(aImapMessage);
+
+  nsresult rv;
+  nsCOMPtr<nsIURI> url = do_QueryInterface(aImapUrl);
+
+  rv = AddImapFetchToUrl(url, aImapMailFolder, messageIdentifierList, aAdditionalHeader);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  if (WeAreOffline())
+  {
+    bool msgIsInCache = false;
+    nsCOMPtr<nsIMsgMailNewsUrl> msgUrl(do_QueryInterface(aImapUrl));
+    msgUrl->GetMsgIsInLocalCache(&msgIsInCache);
+    if (!msgIsInCache)
+      IsMsgInMemCache(url, aImapMailFolder, &msgIsInCache);
+
+    // Display the "offline" message if we didn't find it in the memory cache either
+    if (!msgIsInCache)
+    {
+      nsCOMPtr<nsIMsgIncomingServer> server;
+      rv = aImapMailFolder->GetServer(getter_AddRefs(server));
+      if (server && aDisplayConsumer)
+        rv = server->DisplayOfflineMsg(aMsgWindow);
+      return rv;
+    }
+  }
+
+  if (aURL)
+    NS_IF_ADDREF(*aURL = url);
+
+  return GetMessageFromUrl(aImapUrl, aImapAction, aImapMailFolder, aImapMessage,
+                           aMsgWindow, aDisplayConsumer, aConvertDataToText, aURL);
+}
+
+nsresult nsImapService::GetMessageFromUrl(nsIImapUrl *aImapUrl,
+                                          nsImapAction aImapAction,
+                                          nsIMsgFolder *aImapMailFolder,
+                                          nsIImapMessageSink *aImapMessage,
+                                          nsIMsgWindow *aMsgWindow,
+                                          nsISupports *aDisplayConsumer,
+                                          bool aConvertDataToText,
+                                          nsIURI **aURL)
+{
+  nsresult rv = SetImapUrlSink(aImapMailFolder, aImapUrl);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = aImapUrl->SetImapMessageSink(aImapMessage);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = aImapUrl->SetImapAction(aImapAction);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsIURI> url(do_QueryInterface(aImapUrl));
+
+  // if the display consumer is a docshell, then we should run the url in the docshell.
+  // otherwise, it should be a stream listener....so open a channel using AsyncRead
+  // and the provided stream listener....
+  
+  nsCOMPtr<nsIDocShell> docShell(do_QueryInterface(aDisplayConsumer, &rv));
+  if (aImapMailFolder && docShell)
+  {
+    nsCOMPtr<nsIMsgIncomingServer> aMsgIncomingServer;
+    rv = aImapMailFolder->GetServer(getter_AddRefs(aMsgIncomingServer));
+    if (NS_SUCCEEDED(rv) && aMsgIncomingServer)
+    {
+      bool interrupted;
+      nsCOMPtr<nsIImapIncomingServer>
+        aImapServer(do_QueryInterface(aMsgIncomingServer, &rv));
+      if (NS_SUCCEEDED(rv) && aImapServer)
+        aImapServer->PseudoInterruptMsgLoad(aImapMailFolder, aMsgWindow, &interrupted);
+    }
+  }
+  if (NS_SUCCEEDED(rv) && docShell)
+  {
+    NS_ASSERTION(!aConvertDataToText, "can't convert to text when using docshell");
+    rv = docShell->LoadURI(url, nullptr, nsIWebNavigation::LOAD_FLAGS_NONE, false);
+  }
+  else
+  {
+    nsCOMPtr<nsIStreamListener> streamListener = do_QueryInterface(aDisplayConsumer, &rv);
+    nsCOMPtr<nsIMsgMailNewsUrl> mailnewsUrl = do_QueryInterface(aImapUrl, &rv);
+    if (aMsgWindow && mailnewsUrl)
+      mailnewsUrl->SetMsgWindow(aMsgWindow);
+    if (NS_SUCCEEDED(rv) && streamListener)
+    {
+      nsCOMPtr<nsIChannel> channel;
+      nsCOMPtr<nsILoadGroup> loadGroup;
+      if (NS_SUCCEEDED(rv) && mailnewsUrl)
+        mailnewsUrl->GetLoadGroup(getter_AddRefs(loadGroup));
+      
+      rv = NewChannel(url, getter_AddRefs(channel));
+      NS_ENSURE_SUCCESS(rv, rv);
+      
+      // we need a load group to hold onto the channel. When the request is finished,
+      // it'll get removed from the load group, and the channel will go away,
+      // which will free the load group.
+      if (!loadGroup)
+        loadGroup = do_CreateInstance(NS_LOADGROUP_CONTRACTID);
+
+      rv = channel->SetLoadGroup(loadGroup);
+      NS_ENSURE_SUCCESS(rv, rv);
+      
+      if (aConvertDataToText)
+      {
+        nsCOMPtr<nsIStreamListener> conversionListener;
+        nsCOMPtr<nsIStreamConverterService> streamConverter = do_GetService("@mozilla.org/streamConverters;1", &rv);
+        NS_ENSURE_SUCCESS(rv, rv);
+        rv = streamConverter->AsyncConvertData("message/rfc822",
+                                               "*/*", streamListener, channel, getter_AddRefs(conversionListener));
+        NS_ENSURE_SUCCESS(rv, rv);
+        streamListener = conversionListener; // this is our new listener.
+      }
+
+      nsCOMPtr<nsISupports> aCtxt = do_QueryInterface(url);
+      //  now try to open the channel passing in our display consumer as the listener 
+      rv = channel->AsyncOpen(streamListener, aCtxt);
+    }
+    else // do what we used to do before
+    {
+      // I'd like to get rid of this code as I believe that we always get a docshell
+      // or stream listener passed into us in this method but i'm not sure yet...
+      // I'm going to use an assert for now to figure out if this is ever getting called
+#if defined(DEBUG_mscott) || defined(DEBUG_bienvenu)
+      NS_ERROR("oops...someone still is reaching this part of the code");
+#endif
+      rv = GetImapConnectionAndLoadUrl(aImapUrl,
+                                       aDisplayConsumer, aURL);
+    }
+  }
+  return rv;
+}
+
+// this method streams a message to the passed in consumer, with an optional stream converter
+// and additional header (e.g., "header=filter")
+NS_IMETHODIMP nsImapService::StreamMessage(const char *aMessageURI, 
+                                           nsISupports *aConsumer, 
+                                           nsIMsgWindow *aMsgWindow,
+                                           nsIUrlListener *aUrlListener, 
+                                           bool aConvertData,
+                                           const nsACString &aAdditionalHeader,
+                                           bool aLocalOnly,
+                                           nsIURI **aURL)
+{
+  NS_ENSURE_ARG_POINTER(aMessageURI);
+
+  nsCOMPtr<nsIMsgFolder> folder;
+  nsAutoCString msgKey;
+  nsAutoCString mimePart;
+  nsAutoCString folderURI;
+  nsMsgKey key;
+
+  nsresult rv = DecomposeImapURI(nsDependentCString(aMessageURI), getter_AddRefs(folder), msgKey);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  if (msgKey.IsEmpty())
+    return NS_MSG_MESSAGE_NOT_FOUND;
+  rv = nsParseImapMessageURI(aMessageURI, folderURI, &key, getter_Copies(mimePart));
+  if (NS_SUCCEEDED(rv))
+  {
+    nsCOMPtr<nsIImapMessageSink> imapMessageSink(do_QueryInterface(folder, &rv));
+    if (NS_SUCCEEDED(rv))
+    {
+      nsCOMPtr<nsIImapUrl> imapUrl;
+      nsAutoCString urlSpec;
+      char hierarchyDelimiter = GetHierarchyDelimiter(folder);
+      rv = CreateStartOfImapUrl(nsDependentCString(aMessageURI), getter_AddRefs(imapUrl), 
+                                folder, aUrlListener, urlSpec, hierarchyDelimiter);
+      NS_ENSURE_SUCCESS(rv, rv);
+      nsCOMPtr<nsIMsgMailNewsUrl> msgurl (do_QueryInterface(imapUrl));
+      nsCOMPtr<nsIURI> url(do_QueryInterface(imapUrl));
+
+      // This option is used by the JS Mime Emitter, in case we want a cheap
+      // streaming, for example, if we just want a quick look at some header,
+      // without having to download all the attachments...
+
+      uint32_t messageSize = 0;
+      imapMessageSink->GetMessageSizeFromDB(msgKey.get(), &messageSize);
+      nsAutoCString additionalHeader(aAdditionalHeader);
+      bool fetchOnDemand =
+        additionalHeader.Find("&fetchCompleteMessage=false") != kNotFound &&
+          messageSize > (uint32_t) gMIMEOnDemandThreshold;
+      imapUrl->SetFetchPartsOnDemand(fetchOnDemand);
+
+      // We need to add the fetch command here for the cache lookup to behave correctly
+      rv = AddImapFetchToUrl(url, folder, msgKey, additionalHeader);
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      nsCOMPtr<nsIMsgIncomingServer> aMsgIncomingServer;
+
+      msgurl->SetMsgWindow(aMsgWindow);
+      rv = msgurl->GetServer(getter_AddRefs(aMsgIncomingServer));
+
+      // Try to check if the message is offline
+      bool hasMsgOffline = false;
+      folder->HasMsgOffline(key, &hasMsgOffline);
+      msgurl->SetMsgIsInLocalCache(hasMsgOffline);
+      imapUrl->SetLocalFetchOnly(aLocalOnly);
+
+      // If we don't have the message available locally, and we can't get it over
+      // the network, return with an error
+      if (aLocalOnly || WeAreOffline())
+      {
+        bool isMsgInMemCache = false;
+        if (!hasMsgOffline)
+        {
+          rv = IsMsgInMemCache(url, folder, &isMsgInMemCache);
+          NS_ENSURE_SUCCESS(rv, rv);
+
+          if (!isMsgInMemCache)
+            return NS_ERROR_FAILURE;
+        }
+      }
+
+      bool shouldStoreMsgOffline = false;
+      folder->ShouldStoreMsgOffline(key, &shouldStoreMsgOffline);
+      imapUrl->SetStoreResultsOffline(shouldStoreMsgOffline);
+      rv = GetMessageFromUrl(imapUrl, nsIImapUrl::nsImapMsgFetchPeek, folder,
+                             imapMessageSink, aMsgWindow, aConsumer,
+                             aConvertData, aURL);
+    }
+  }
+  return rv;
+}
+
+// this method streams a message's headers to the passed in consumer.
+NS_IMETHODIMP nsImapService::StreamHeaders(const char *aMessageURI,
+                                           nsIStreamListener *aConsumer,
+                                           nsIUrlListener *aUrlListener,
+                                           bool aLocalOnly,
+                                           nsIURI **aURL)
+{
+  NS_ENSURE_ARG_POINTER(aMessageURI);
+  NS_ENSURE_ARG_POINTER(aConsumer);
+  nsCOMPtr<nsIMsgFolder> folder;
+  nsAutoCString msgKey;
+  nsAutoCString folderURI;
+  nsCString mimePart;
+  nsMsgKey key;
+
+  nsresult rv = DecomposeImapURI(nsDependentCString(aMessageURI), getter_AddRefs(folder), msgKey);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  if (msgKey.IsEmpty())
+    return NS_MSG_MESSAGE_NOT_FOUND;
+  rv = nsParseImapMessageURI(aMessageURI, folderURI, &key, getter_Copies(mimePart));
+  if (NS_SUCCEEDED(rv))
+  {
+    nsCOMPtr<nsIInputStream> inputStream;
+    bool hasMsgOffline = false;
+    folder->HasMsgOffline(key, &hasMsgOffline);
+    if (hasMsgOffline)
+    {
+      int64_t messageOffset;
+      uint32_t messageSize;
+      folder->GetOfflineFileStream(key, &messageOffset, &messageSize, getter_AddRefs(inputStream));
+      if (inputStream)
+        return MsgStreamMsgHeaders(inputStream, aConsumer);
+    }
+  }
+
+  if (aLocalOnly)
+    return NS_ERROR_FAILURE;
+  return rv;
+}
+
+NS_IMETHODIMP nsImapService::IsMsgInMemCache(nsIURI *aUrl,
+                                             nsIMsgFolder *aImapMailFolder,
+                                             bool *aResult)
+{
+  NS_ENSURE_ARG_POINTER(aUrl);
+  NS_ENSURE_ARG_POINTER(aImapMailFolder);
+  *aResult = false;
+
+  // Poke around in the memory cache
+  if (mCacheStorage)
+  {
+    nsAutoCString urlSpec;
+    aUrl->GetSpec(urlSpec);
+
+    // Strip any query qualifiers.
+    bool truncated = false;
+    int32_t ind = urlSpec.FindChar('?');
+    if (ind != kNotFound) {
+      urlSpec.SetLength(ind);
+      truncated = true;
+    }
+    ind = urlSpec.Find("/;");
+    if (ind != kNotFound) {
+      urlSpec.SetLength(ind);
+      truncated = true;
+    }
+
+    nsresult rv;
+    nsCOMPtr<nsIImapMailFolderSink> folderSink(do_QueryInterface(aImapMailFolder, &rv));
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    int32_t uidValidity = -1;
+    folderSink->GetUidValidity(&uidValidity);
+    // stick the uid validity in front of the url, so that if the uid validity
+    // changes, we won't re-use the wrong cache entries.
+    nsAutoCString extension;
+    extension.AppendInt(uidValidity, 16);
+
+    bool exists;
+    if (truncated) {
+      nsCOMPtr<nsIURI> newUri;
+      aUrl->Clone(getter_AddRefs(newUri));
+      newUri->SetSpec(urlSpec);
+      rv = mCacheStorage->Exists(newUri, extension, &exists);
+    } else {
+      rv = mCacheStorage->Exists(aUrl, extension, &exists);
+    }
+    if (NS_SUCCEEDED(rv) && exists) {
+      *aResult = true;
+    }
+  }
+
+  return NS_OK;
+}
+
+nsresult nsImapService::CreateStartOfImapUrl(const nsACString &aImapURI, 
+                                             nsIImapUrl **imapUrl,
+                                             nsIMsgFolder *aImapMailFolder,
+                                             nsIUrlListener *aUrlListener,
+                                             nsACString &urlSpec, 
+                                             char &hierarchyDelimiter)
+{
+  NS_ENSURE_ARG_POINTER(aImapMailFolder);
+
+  nsCString hostname;
+  nsCString username;
+  nsCString escapedUsername;
+
+  nsresult rv = aImapMailFolder->GetHostname(hostname);
+  NS_ENSURE_SUCCESS(rv, rv);
+  rv = aImapMailFolder->GetUsername(username);
+  NS_ENSURE_SUCCESS(rv, rv);
+  if (!username.IsEmpty())
+    MsgEscapeString(username, nsINetUtil::ESCAPE_XALPHAS, escapedUsername);
+
+  int32_t port = nsIImapUrl::DEFAULT_IMAP_PORT;
+  nsCOMPtr<nsIMsgIncomingServer> server;
+  rv = aImapMailFolder->GetServer(getter_AddRefs(server));
+  if (NS_SUCCEEDED(rv)) 
+  {
+    server->GetPort(&port);
+    if (port == -1 || port == 0) port = nsIImapUrl::DEFAULT_IMAP_PORT;
+  }
+
+  // now we need to create an imap url to load into the connection. The url
+  // needs to represent a select folder action. 
+  rv = CallCreateInstance(kImapUrlCID, imapUrl);
+  if (NS_SUCCEEDED(rv) && *imapUrl)
+  {
+    nsCOMPtr<nsIMsgMailNewsUrl> mailnewsUrl = do_QueryInterface(*imapUrl, &rv);
+    if (NS_SUCCEEDED(rv) && mailnewsUrl && aUrlListener)
+      mailnewsUrl->RegisterListener(aUrlListener);
+    nsCOMPtr<nsIMsgMessageUrl> msgurl(do_QueryInterface(*imapUrl));
+    (*imapUrl)->SetExternalLinkUrl(false);
+    msgurl->SetUri(PromiseFlatCString(aImapURI).get());
+
+    urlSpec = "imap://";
+    urlSpec.Append(escapedUsername);
+    urlSpec.Append('@');
+    urlSpec.Append(hostname);
+    urlSpec.Append(':');
+
+    nsAutoCString portStr;
+    portStr.AppendInt(port);
+    urlSpec.Append(portStr);
+
+    // *** jefft - force to parse the urlSpec in order to search for
+    // the correct incoming server
+    rv = mailnewsUrl->SetSpec(urlSpec);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    hierarchyDelimiter = kOnlineHierarchySeparatorUnknown;
+    nsCOMPtr <nsIMsgImapMailFolder> imapFolder = do_QueryInterface(aImapMailFolder);
+    if (imapFolder)
+      imapFolder->GetHierarchyDelimiter(&hierarchyDelimiter);
+  }
+  return rv;
+}
+
+/* fetching the headers of RFC822 messages */
+/* imap4://HOST>header><UID/SEQUENCE>>MAILBOXPATH>x */
+/*   'x' is the message UID or sequence number list */
+/* will not affect the 'SEEN' flag */
+NS_IMETHODIMP nsImapService::GetHeaders(nsIMsgFolder *aImapMailFolder, 
+                                        nsIUrlListener *aUrlListener, 
+                                        nsIURI **aURL,
+                                        const nsACString &messageIdentifierList,
+                                        bool messageIdsAreUID)
+{
+  // create a protocol instance to handle the request.
+  // NOTE: once we start working with multiple connections, this step will be much more complicated...but for now
+  // just create a connection and process the request.
+  NS_ENSURE_ARG_POINTER(aImapMailFolder);
+
+  nsCOMPtr<nsIImapUrl> imapUrl;
+  nsAutoCString urlSpec;
+  char hierarchyDelimiter = GetHierarchyDelimiter(aImapMailFolder);
+
+  nsresult rv = CreateStartOfImapUrl(EmptyCString(), getter_AddRefs(imapUrl), aImapMailFolder, 
+                                     aUrlListener, urlSpec, hierarchyDelimiter);
+  if (NS_SUCCEEDED(rv) && imapUrl)
+  {
+    nsCOMPtr<nsIURI> uri = do_QueryInterface(imapUrl);
+
+    rv = imapUrl->SetImapAction(nsIImapUrl::nsImapMsgFetch);
+    rv = SetImapUrlSink(aImapMailFolder, imapUrl);
+
+    if (NS_SUCCEEDED(rv))
+    {
+      urlSpec.Append("/header>");
+      urlSpec.Append(messageIdsAreUID ? uidString : sequenceString);
+      urlSpec.Append(">");
+      urlSpec.Append(char (hierarchyDelimiter));
+
+      nsCString folderName;
+
+      GetFolderName(aImapMailFolder, folderName);
+      urlSpec.Append(folderName);
+      urlSpec.Append(">");
+      urlSpec.Append(messageIdentifierList);
+      rv = uri->SetSpec(urlSpec);
+
+      if (NS_SUCCEEDED(rv))
+        rv = GetImapConnectionAndLoadUrl(imapUrl, nullptr, aURL);
+    }
+  }
+  return rv;
+}
+
+
+/* peeking at the start of msg bodies */
+/* imap4://HOST>header><UID>>MAILBOXPATH>x>n */
+/*   'x' is the message UID */
+/*   'n' is the number of bytes to fetch */
+/* will not affect the 'SEEN' flag */
+NS_IMETHODIMP nsImapService::GetBodyStart(nsIMsgFolder *aImapMailFolder, 
+                                          nsIUrlListener *aUrlListener, 
+                                          const nsACString &messageIdentifierList,
+                                          int32_t numBytes,
+                                          nsIURI **aURL)
+{
+  NS_ENSURE_ARG_POINTER(aImapMailFolder);
+
+  nsresult rv;
+  nsCOMPtr<nsIImapUrl> imapUrl;
+  nsAutoCString urlSpec;
+
+  char hierarchyDelimiter = GetHierarchyDelimiter(aImapMailFolder);
+  rv = CreateStartOfImapUrl(EmptyCString(), getter_AddRefs(imapUrl), aImapMailFolder, 
+    aUrlListener, urlSpec, hierarchyDelimiter);
+  if (NS_SUCCEEDED(rv) && imapUrl)
+  {
+    rv = imapUrl->SetImapAction(nsIImapUrl::nsImapMsgPreview);
+    rv = SetImapUrlSink(aImapMailFolder, imapUrl);
+
+    if (NS_SUCCEEDED(rv))
+    {
+      nsCOMPtr<nsIURI> uri = do_QueryInterface(imapUrl);
+
+      urlSpec.Append("/previewBody>");
+      urlSpec.Append(uidString);
+      urlSpec.Append(">");
+      urlSpec.Append(hierarchyDelimiter);
+
+      nsCString folderName;
+      GetFolderName(aImapMailFolder, folderName);
+      urlSpec.Append(folderName);
+      urlSpec.Append(">");
+      urlSpec.Append(messageIdentifierList);
+      urlSpec.Append(">");
+      urlSpec.AppendInt(numBytes);
+      rv = uri->SetSpec(urlSpec);
+      if (NS_SUCCEEDED(rv))
+        rv = GetImapConnectionAndLoadUrl(imapUrl, nullptr, aURL);
+    }
+  }
+  return rv;
+}
+
+nsresult nsImapService::FolderCommand(nsIMsgFolder *imapMailFolder,
+                                      nsIUrlListener *urlListener,
+                                      const char *aCommand,
+                                      nsImapAction imapAction,
+                                      nsIMsgWindow *msgWindow,
+                                      nsIURI **url)
+{
+  NS_ENSURE_ARG_POINTER(imapMailFolder);
+
+  nsCOMPtr<nsIImapUrl> imapUrl;
+  nsAutoCString urlSpec;
+
+  char hierarchyDelimiter = GetHierarchyDelimiter(imapMailFolder);
+  nsresult rv = CreateStartOfImapUrl(EmptyCString(), getter_AddRefs(imapUrl),
+                                     imapMailFolder, urlListener, urlSpec, hierarchyDelimiter);
+  if (NS_SUCCEEDED(rv) && imapUrl)
+  {
+    rv = imapUrl->SetImapAction(imapAction);
+    rv = SetImapUrlSink(imapMailFolder, imapUrl);
+    nsCOMPtr<nsIURI> uri = do_QueryInterface(imapUrl);
+    nsCOMPtr<nsIMsgMailNewsUrl> mailnewsurl = do_QueryInterface(imapUrl);
+    if (mailnewsurl)
+      mailnewsurl->SetMsgWindow(msgWindow);
+
+    if (NS_SUCCEEDED(rv))
+    {
+      urlSpec.Append(aCommand);
+      urlSpec.Append(hierarchyDelimiter);
+
+      nsCString folderName;
+      GetFolderName(imapMailFolder, folderName);
+      urlSpec.Append(folderName);
+      rv = uri->SetSpec(urlSpec);
+      if (NS_SUCCEEDED(rv))
+        rv = GetImapConnectionAndLoadUrl(imapUrl, nullptr, url);
+    }
+  }
+  return rv;
+}
+
+NS_IMETHODIMP
+nsImapService::VerifyLogon(nsIMsgFolder *aFolder, nsIUrlListener *aUrlListener,
+                           nsIMsgWindow *aMsgWindow, nsIURI **aURL)
+{
+  nsCOMPtr<nsIImapUrl> imapUrl;
+  nsAutoCString urlSpec;
+
+  char delimiter = '/'; // shouldn't matter what is is.
+  nsresult rv = CreateStartOfImapUrl(EmptyCString(), getter_AddRefs(imapUrl), aFolder,
+                                     aUrlListener, urlSpec, delimiter);
+  if (NS_SUCCEEDED(rv) && imapUrl)
+  {
+    nsCOMPtr<nsIURI> uri = do_QueryInterface(imapUrl);
+
+    nsCOMPtr<nsIMsgMailNewsUrl> mailNewsUrl = do_QueryInterface(imapUrl);
+    mailNewsUrl->SetSuppressErrorMsgs(true);
+    mailNewsUrl->SetMsgWindow(aMsgWindow);
+    rv = SetImapUrlSink(aFolder, imapUrl);
+    urlSpec.Append("/verifyLogon");
+    rv = uri->SetSpec(urlSpec);
+    if (NS_SUCCEEDED(rv))
+      rv = GetImapConnectionAndLoadUrl(imapUrl, nullptr, nullptr);
+    if (aURL)
+      uri.forget(aURL);
+  }
+  return rv;
+}
+
+// Noop, used to update a folder (causes server to send changes).
+NS_IMETHODIMP nsImapService::Noop(nsIMsgFolder *aImapMailFolder,
+                                  nsIUrlListener *aUrlListener, 
+                                  nsIURI **aURL)
+{
+  NS_ENSURE_ARG_POINTER(aImapMailFolder);
+
+  return FolderCommand(aImapMailFolder, aUrlListener,
+                       "/selectnoop>", nsIImapUrl::nsImapSelectNoopFolder, nullptr, aURL);
+}
+    
+// FolderStatus, used to update message counts
+NS_IMETHODIMP nsImapService::UpdateFolderStatus(nsIMsgFolder *aImapMailFolder,
+                                                nsIUrlListener *aUrlListener, 
+                                                nsIURI **aURL)
+{
+  NS_ENSURE_ARG_POINTER(aImapMailFolder);
+
+  return FolderCommand(aImapMailFolder, aUrlListener,
+                       "/folderstatus>", nsIImapUrl::nsImapFolderStatus, nullptr, aURL);
+}
+
+// Expunge, used to "compress" an imap folder,removes deleted messages.
+NS_IMETHODIMP nsImapService::Expunge(nsIMsgFolder *aImapMailFolder,
+                                     nsIUrlListener *aUrlListener,
+                                     nsIMsgWindow *aMsgWindow,
+                                     nsIURI **aURL)
+{
+  NS_ENSURE_ARG_POINTER(aImapMailFolder);
+
+  return FolderCommand(aImapMailFolder, aUrlListener,
+                       "/Expunge>", nsIImapUrl::nsImapExpungeFolder, aMsgWindow, aURL);
+}
+
+/* old-stle biff that doesn't download headers */
+NS_IMETHODIMP nsImapService::Biff(nsIMsgFolder *aImapMailFolder,
+                                  nsIUrlListener *aUrlListener, 
+                                  nsIURI **aURL,
+                                  uint32_t uidHighWater)
+{
+  NS_ENSURE_ARG_POINTER(aImapMailFolder);
+
+  // static const char *formatString = "biff>%c%s>%ld";
+  nsCOMPtr<nsIImapUrl> imapUrl;
+  nsAutoCString urlSpec;
+
+  char hierarchyDelimiter = GetHierarchyDelimiter(aImapMailFolder);
+  nsresult rv = CreateStartOfImapUrl(EmptyCString(), getter_AddRefs(imapUrl),
+    aImapMailFolder, aUrlListener, urlSpec, hierarchyDelimiter);
+  if (NS_SUCCEEDED(rv) && imapUrl)
+  {
+    rv = imapUrl->SetImapAction(nsIImapUrl::nsImapExpungeFolder);
+    rv = SetImapUrlSink(aImapMailFolder, imapUrl);
+
+    nsCOMPtr<nsIURI> uri = do_QueryInterface(imapUrl);
+    if (NS_SUCCEEDED(rv))
+    {
+      urlSpec.Append("/Biff>");
+      urlSpec.Append(hierarchyDelimiter);
+
+      nsCString folderName;
+      GetFolderName(aImapMailFolder, folderName);
+      urlSpec.Append(folderName);
+      urlSpec.Append(">");
+      urlSpec.AppendInt(uidHighWater);
+      rv = uri->SetSpec(urlSpec);
+      if (NS_SUCCEEDED(rv))
+        rv = GetImapConnectionAndLoadUrl(imapUrl, nullptr, aURL);
+    }
+  }
+  return rv;
+}
+
+NS_IMETHODIMP nsImapService::DeleteFolder(nsIMsgFolder *aImapMailFolder,
+                                          nsIUrlListener *aUrlListener,
+                                          nsIMsgWindow *aMsgWindow,
+                                          nsIURI **aURL)
+{
+  NS_ENSURE_ARG_POINTER(aImapMailFolder);
+
+  // If it's an aol server then use 'deletefolder' url to 
+  // remove all msgs first and then remove the folder itself.
+  bool removeFolderAndMsgs = false;
+  nsCOMPtr<nsIMsgIncomingServer> server;
+  if (NS_SUCCEEDED(aImapMailFolder->GetServer(getter_AddRefs(server))) && server)
+  {
+    nsCOMPtr <nsIImapIncomingServer> imapServer = do_QueryInterface(server);
+    if (imapServer) 
+      imapServer->GetIsAOLServer(&removeFolderAndMsgs);
+  }
+  
+  return FolderCommand(aImapMailFolder, aUrlListener,
+                       removeFolderAndMsgs ? "/deletefolder>" : "/delete>", 
+                       nsIImapUrl::nsImapDeleteFolder, aMsgWindow, aURL);
+}
+
+NS_IMETHODIMP nsImapService::DeleteMessages(nsIMsgFolder *aImapMailFolder, 
+                                            nsIUrlListener *aUrlListener, 
+                                            nsIURI **aURL,
+                                            const nsACString &messageIdentifierList,
+                                            bool messageIdsAreUID)
+{
+  NS_ENSURE_ARG_POINTER(aImapMailFolder);
+
+  // create a protocol instance to handle the request.
+  // NOTE: once we start working with multiple connections, this step will be much more complicated...but for now
+  // just create a connection and process the request.
+  nsresult rv;
+  nsCOMPtr<nsIImapUrl> imapUrl;
+  nsAutoCString urlSpec;
+
+  char hierarchyDelimiter = GetHierarchyDelimiter(aImapMailFolder);
+  rv = CreateStartOfImapUrl(EmptyCString(), getter_AddRefs(imapUrl), aImapMailFolder, 
+    aUrlListener, urlSpec, hierarchyDelimiter);
+  if (NS_SUCCEEDED(rv) && imapUrl)
+  {
+    rv = imapUrl->SetImapAction(nsIImapUrl::nsImapMsgFetch);
+    rv = SetImapUrlSink(aImapMailFolder, imapUrl);
+
+    if (NS_SUCCEEDED(rv))
+    {
+      nsCOMPtr<nsIURI> uri = do_QueryInterface(imapUrl);
+
+      urlSpec.Append("/deletemsg>");
+      urlSpec.Append(messageIdsAreUID ? uidString : sequenceString);
+      urlSpec.Append(">");
+      urlSpec.Append(hierarchyDelimiter);
+
+      nsCString folderName;
+      GetFolderName(aImapMailFolder, folderName);
+      urlSpec.Append(folderName);
+      urlSpec.Append(">");
+      urlSpec.Append(messageIdentifierList);
+      rv = uri->SetSpec(urlSpec);
+      if (NS_SUCCEEDED(rv))
+        rv = GetImapConnectionAndLoadUrl(imapUrl, nullptr, aURL);
+    }
+  }
+  return rv;
+}
+
+// Delete all messages in a folder, used to empty trash
+NS_IMETHODIMP nsImapService::DeleteAllMessages(nsIMsgFolder *aImapMailFolder,
+                                               nsIUrlListener *aUrlListener, 
+                                               nsIURI **aURL)
+{
+  NS_ENSURE_ARG_POINTER(aImapMailFolder);
+
+  return FolderCommand(aImapMailFolder, aUrlListener,
+                      "/deleteallmsgs>", nsIImapUrl::nsImapSelectNoopFolder, nullptr, aURL);
+}
+
+NS_IMETHODIMP nsImapService::AddMessageFlags(nsIMsgFolder *aImapMailFolder,
+                                             nsIUrlListener *aUrlListener,
+                                             nsIURI **aURL,
+                                             const nsACString &messageIdentifierList,
+                                             imapMessageFlagsType flags,
+                                             bool messageIdsAreUID)
+{
+  NS_ENSURE_ARG_POINTER(aImapMailFolder);
+
+  return DiddleFlags(aImapMailFolder, aUrlListener, aURL, messageIdentifierList,
+                     "addmsgflags", flags, messageIdsAreUID);
+}
+
+NS_IMETHODIMP nsImapService::SubtractMessageFlags(nsIMsgFolder *aImapMailFolder,
+                                                  nsIUrlListener *aUrlListener,
+                                                  nsIURI **aURL,
+                                                  const nsACString &messageIdentifierList,
+                                                  imapMessageFlagsType flags,
+                                                  bool messageIdsAreUID)
+{
+  NS_ENSURE_ARG_POINTER(aImapMailFolder);
+
+  return DiddleFlags(aImapMailFolder, aUrlListener, aURL, messageIdentifierList,
+                     "subtractmsgflags", flags, messageIdsAreUID);
+}
+
+NS_IMETHODIMP nsImapService::SetMessageFlags(nsIMsgFolder *aImapMailFolder,
+                                             nsIUrlListener *aUrlListener,
+                                             nsIURI **aURL,
+                                             const nsACString &messageIdentifierList,
+                                             imapMessageFlagsType flags,
+                                             bool messageIdsAreUID)
+{
+  NS_ENSURE_ARG_POINTER(aImapMailFolder);
+
+  return DiddleFlags(aImapMailFolder, aUrlListener, aURL, messageIdentifierList,
+                     "setmsgflags", flags, messageIdsAreUID);
+}
+
+nsresult nsImapService::DiddleFlags(nsIMsgFolder *aImapMailFolder,
+                                    nsIUrlListener *aUrlListener,
+                                    nsIURI **aURL,
+                                    const nsACString &messageIdentifierList,
+                                    const char *howToDiddle,
+                                    imapMessageFlagsType flags,
+                                    bool messageIdsAreUID)
+{
+  NS_ENSURE_ARG_POINTER(aImapMailFolder);
+
+  // create a protocol instance to handle the request.
+  // NOTE: once we start working with multiple connections, 
+  //       this step will be much more complicated...but for now
+  // just create a connection and process the request.
+  nsCOMPtr<nsIImapUrl> imapUrl;
+  nsAutoCString urlSpec;
+
+  char hierarchyDelimiter = GetHierarchyDelimiter(aImapMailFolder);
+  nsresult rv = CreateStartOfImapUrl(EmptyCString(), getter_AddRefs(imapUrl),
+                                     aImapMailFolder, aUrlListener, urlSpec, hierarchyDelimiter); 
+  if (NS_SUCCEEDED(rv) && imapUrl)
+  {
+    rv = imapUrl->SetImapAction(nsIImapUrl::nsImapMsgFetch);
+    rv = SetImapUrlSink(aImapMailFolder, imapUrl);
+
+    if (NS_SUCCEEDED(rv))
+    {
+      nsCOMPtr<nsIURI> uri = do_QueryInterface(imapUrl);
+
+      urlSpec.Append('/');
+      urlSpec.Append(howToDiddle);
+      urlSpec.Append('>');
+      urlSpec.Append(messageIdsAreUID ? uidString : sequenceString);
+      urlSpec.Append(">");
+      urlSpec.Append(hierarchyDelimiter);
+      nsCString folderName;
+      GetFolderName(aImapMailFolder, folderName);
+      urlSpec.Append(folderName);
+      urlSpec.Append(">");
+      urlSpec.Append(messageIdentifierList);
+      urlSpec.Append('>');
+      urlSpec.AppendInt(flags);
+      rv = uri->SetSpec(urlSpec);
+      if (NS_SUCCEEDED(rv))
+        rv = GetImapConnectionAndLoadUrl(imapUrl, nullptr, aURL);
+    }
+  }
+  return rv;
+}
+
+nsresult nsImapService::SetImapUrlSink(nsIMsgFolder *aMsgFolder, nsIImapUrl *aImapUrl)
+{
+  NS_ENSURE_ARG_POINTER(aMsgFolder);
+  NS_ENSURE_ARG_POINTER(aImapUrl);
+  
+  nsresult rv;
+  nsCOMPtr<nsIMsgIncomingServer> incomingServer;
+  nsCOMPtr<nsIImapServerSink> imapServerSink;
+    
+  rv = aMsgFolder->GetServer(getter_AddRefs(incomingServer));
+  if (NS_SUCCEEDED(rv) && incomingServer)
+  {
+    imapServerSink = do_QueryInterface(incomingServer);
+    if (imapServerSink)
+      aImapUrl->SetImapServerSink(imapServerSink);
+  }
+   
+  nsCOMPtr<nsIImapMailFolderSink> imapMailFolderSink = do_QueryInterface(aMsgFolder);
+  if (NS_SUCCEEDED(rv) && imapMailFolderSink)
+    aImapUrl->SetImapMailFolderSink(imapMailFolderSink);
+  
+  nsCOMPtr<nsIImapMessageSink> imapMessageSink = do_QueryInterface(aMsgFolder);
+  if (NS_SUCCEEDED(rv) && imapMessageSink)
+    aImapUrl->SetImapMessageSink(imapMessageSink);
+  
+  nsCOMPtr <nsIMsgMailNewsUrl> mailnewsUrl = do_QueryInterface(aImapUrl);
+  mailnewsUrl->SetFolder(aMsgFolder);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsImapService::DiscoverAllFolders(nsIMsgFolder *aImapMailFolder,
+                                                nsIUrlListener *aUrlListener,
+                                                nsIMsgWindow *aMsgWindow,
+                                                nsIURI **aURL)
+{
+  NS_ENSURE_ARG_POINTER(aImapMailFolder);
+
+  nsCOMPtr<nsIImapUrl> imapUrl;
+  nsAutoCString urlSpec;
+
+  char hierarchyDelimiter = GetHierarchyDelimiter(aImapMailFolder);
+  nsresult rv = CreateStartOfImapUrl(EmptyCString(), getter_AddRefs(imapUrl), aImapMailFolder, 
+                                     aUrlListener, urlSpec, hierarchyDelimiter);
+  if (NS_SUCCEEDED (rv))
+  {
+    rv = SetImapUrlSink(aImapMailFolder, imapUrl);
+
+    if (NS_SUCCEEDED(rv))
+    {
+      nsCOMPtr<nsIURI> uri = do_QueryInterface(imapUrl);
+      nsCOMPtr<nsIMsgMailNewsUrl> mailnewsurl = do_QueryInterface(imapUrl);
+      if (mailnewsurl)
+        mailnewsurl->SetMsgWindow(aMsgWindow);
+      urlSpec.Append("/discoverallboxes");
+      nsCOMPtr <nsIURI> url = do_QueryInterface(imapUrl, &rv);
+      rv = uri->SetSpec(urlSpec);
+      if (NS_SUCCEEDED(rv))
+        rv = GetImapConnectionAndLoadUrl(imapUrl, nullptr, aURL);
+    }
+  }
+  return rv;
+}
+
+NS_IMETHODIMP nsImapService::DiscoverAllAndSubscribedFolders(nsIMsgFolder *aImapMailFolder,
+                                                             nsIUrlListener *aUrlListener,
+                                                             nsIURI **aURL)
+{
+  NS_ENSURE_ARG_POINTER(aImapMailFolder);
+
+  nsCOMPtr<nsIImapUrl> aImapUrl;
+  nsAutoCString urlSpec;
+
+  char hierarchyDelimiter = GetHierarchyDelimiter(aImapMailFolder);
+  nsresult rv = CreateStartOfImapUrl(EmptyCString(), getter_AddRefs(aImapUrl), aImapMailFolder,
+                                     aUrlListener, urlSpec, hierarchyDelimiter);
+  if (NS_SUCCEEDED(rv) && aImapUrl)
+  {
+    rv = SetImapUrlSink(aImapMailFolder, aImapUrl);
+    if (NS_SUCCEEDED(rv))
+    {
+      nsCOMPtr<nsIURI> uri = do_QueryInterface(aImapUrl);
+      urlSpec.Append("/discoverallandsubscribedboxes");
+      rv = uri->SetSpec(urlSpec);
+      if (NS_SUCCEEDED(rv))
+        rv = GetImapConnectionAndLoadUrl(aImapUrl, nullptr, aURL);
+    }
+  }
+  return rv;
+}
+
+NS_IMETHODIMP nsImapService::DiscoverChildren(nsIMsgFolder *aImapMailFolder,
+                                              nsIUrlListener *aUrlListener,
+                                              const nsACString &folderPath,
+                                              nsIURI **aURL)
+{
+  NS_ENSURE_ARG_POINTER(aImapMailFolder);
+
+  nsCOMPtr<nsIImapUrl> aImapUrl;
+  nsAutoCString urlSpec;
+
+  char hierarchyDelimiter = GetHierarchyDelimiter(aImapMailFolder);
+  nsresult rv = CreateStartOfImapUrl(EmptyCString(), getter_AddRefs(aImapUrl), aImapMailFolder, 
+                                     aUrlListener, urlSpec, hierarchyDelimiter);
+  if (NS_SUCCEEDED (rv))
+  {
+    rv = SetImapUrlSink(aImapMailFolder, aImapUrl);
+    if (NS_SUCCEEDED(rv))
+    {
+      if (!folderPath.IsEmpty())
+      {
+        nsCOMPtr<nsIURI> uri = do_QueryInterface(aImapUrl);
+        urlSpec.Append("/discoverchildren>");
+        urlSpec.Append(hierarchyDelimiter);
+        urlSpec.Append(folderPath);
+        rv = uri->SetSpec(urlSpec);
+
+        // Make sure the uri has the same hierarchy separator as the one in msg folder 
+        // obj if it's not kOnlineHierarchySeparatorUnknown (ie, '^').
+        char uriDelimiter;
+        nsresult rv1 = aImapUrl->GetOnlineSubDirSeparator(&uriDelimiter);
+        if (NS_SUCCEEDED (rv1) && hierarchyDelimiter != kOnlineHierarchySeparatorUnknown &&
+            uriDelimiter != hierarchyDelimiter)
+          aImapUrl->SetOnlineSubDirSeparator(hierarchyDelimiter);
+
+        if (NS_SUCCEEDED(rv))
+          rv = GetImapConnectionAndLoadUrl(aImapUrl, nullptr, aURL);
+      }
+      else
+        rv = NS_ERROR_FAILURE;
+    }
+  }
+  return rv;
+}
+
+NS_IMETHODIMP nsImapService::OnlineMessageCopy(nsIMsgFolder *aSrcFolder,
+                                               const nsACString &messageIds,
+                                               nsIMsgFolder *aDstFolder,
+                                               bool idsAreUids,
+                                               bool isMove,
+                                               nsIUrlListener *aUrlListener,
+                                               nsIURI **aURL,
+                                               nsISupports *copyState,
+                                               nsIMsgWindow *aMsgWindow)
+{
+  NS_ENSURE_ARG_POINTER(aSrcFolder);
+  NS_ENSURE_ARG_POINTER(aDstFolder);
+
+  nsresult rv;
+  nsCOMPtr<nsIMsgIncomingServer> srcServer;
+  nsCOMPtr<nsIMsgIncomingServer> dstServer;
+
+  rv = aSrcFolder->GetServer(getter_AddRefs(srcServer));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  rv = aDstFolder->GetServer(getter_AddRefs(dstServer));
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  bool sameServer;
+  rv = dstServer->Equals(srcServer, &sameServer);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  if (!sameServer) 
+  {
+    NS_ASSERTION(false, "can't use this method to copy across servers");
+    // *** can only take message from the same imap host and user accnt
+    return NS_ERROR_FAILURE;
+  }
+
+  nsCOMPtr<nsIImapUrl> imapUrl;
+  nsAutoCString urlSpec;
+
+  char hierarchyDelimiter = GetHierarchyDelimiter(aSrcFolder);
+  rv = CreateStartOfImapUrl(EmptyCString(), getter_AddRefs(imapUrl), aSrcFolder, aUrlListener, urlSpec, hierarchyDelimiter);
+  if (NS_SUCCEEDED(rv))
+  {
+    SetImapUrlSink(aSrcFolder, imapUrl);
+    imapUrl->SetCopyState(copyState);
+
+    nsCOMPtr<nsIMsgMailNewsUrl> msgurl (do_QueryInterface(imapUrl));
+
+    msgurl->SetMsgWindow(aMsgWindow);
+    nsCOMPtr<nsIURI> uri = do_QueryInterface(imapUrl);
+
+    if (isMove)
+      urlSpec.Append("/onlinemove>");
+    else
+      urlSpec.Append("/onlinecopy>");
+    if (idsAreUids)
+      urlSpec.Append(uidString);
+    else
+      urlSpec.Append(sequenceString);
+    urlSpec.Append('>');
+    urlSpec.Append(hierarchyDelimiter);
+
+    nsCString folderName;
+    GetFolderName(aSrcFolder, folderName);
+    urlSpec.Append(folderName);
+    urlSpec.Append('>');
+    urlSpec.Append(messageIds);
+    urlSpec.Append('>');
+    urlSpec.Append(hierarchyDelimiter);
+    folderName.Adopt(strdup(""));
+    GetFolderName(aDstFolder, folderName);
+    urlSpec.Append(folderName);
+
+    rv = uri->SetSpec(urlSpec);
+    if (NS_SUCCEEDED(rv))
+      rv = GetImapConnectionAndLoadUrl(imapUrl, nullptr, aURL);
+  }
+  return rv;
+}
+
+nsresult nsImapService::OfflineAppendFromFile(nsIFile *aFile,
+                                              nsIURI *aUrl,
+                                              nsIMsgFolder* aDstFolder,
+                                              const nsACString &messageId,  // to be replaced
+                                              bool inSelectedState, // needs to be in
+                                              nsIUrlListener *aListener,
+                                              nsIURI **aURL,
+                                              nsISupports *aCopyState)
+{
+  nsCOMPtr<nsIMsgDatabase> destDB;
+  nsresult rv = aDstFolder->GetMsgDatabase(getter_AddRefs(destDB));
+  // ### might need to send some notifications instead of just returning
+
+  bool isLocked;
+  aDstFolder->GetLocked(&isLocked);
+  if (isLocked)
+    return NS_MSG_FOLDER_BUSY;
+
+  if (NS_SUCCEEDED(rv) && destDB)
+  {
+    nsMsgKey fakeKey;
+    destDB->GetNextFakeOfflineMsgKey(&fakeKey);
+
+    nsCOMPtr <nsIMsgOfflineImapOperation> op;
+    rv = destDB->GetOfflineOpForKey(fakeKey, true, getter_AddRefs(op));
+    if (NS_SUCCEEDED(rv) && op)
+    {
+      nsCString destFolderUri;
+      aDstFolder->GetURI(destFolderUri);
+      op->SetOperation(nsIMsgOfflineImapOperation::kAppendDraft); // ### do we care if it's a template?
+      op->SetDestinationFolderURI(destFolderUri.get());
+      nsCOMPtr <nsIOutputStream> offlineStore;
+      nsCOMPtr<nsIMsgPluggableStore> msgStore;
+      nsCOMPtr<nsIMsgIncomingServer> dstServer;
+      nsCOMPtr<nsIMsgDBHdr> newMsgHdr;
+
+      aDstFolder->GetServer(getter_AddRefs(dstServer));
+      rv = dstServer->GetMsgStore(getter_AddRefs(msgStore));
+      NS_ENSURE_SUCCESS(rv, rv);
+      rv = destDB->CreateNewHdr(fakeKey, getter_AddRefs(newMsgHdr));
+      NS_ENSURE_SUCCESS(rv, rv);
+      rv = aDstFolder->GetOfflineStoreOutputStream(newMsgHdr, getter_AddRefs(offlineStore));
+
+      if (NS_SUCCEEDED(rv) && offlineStore)
+      {
+        int64_t curOfflineStorePos = 0;
+        nsCOMPtr <nsISeekableStream> seekable = do_QueryInterface(offlineStore);
+        if (seekable)
+          seekable->Tell(&curOfflineStorePos);
+        else
+        {
+          NS_ERROR("needs to be a random store!");
+          return NS_ERROR_FAILURE;
+        }
+
+        nsCOMPtr <nsIInputStream> inputStream;
+        nsCOMPtr <nsIMsgParseMailMsgState> msgParser = do_CreateInstance(NS_PARSEMAILMSGSTATE_CONTRACTID, &rv);
+        msgParser->SetMailDB(destDB);
+
+        rv = NS_NewLocalFileInputStream(getter_AddRefs(inputStream), aFile);
+        if (NS_SUCCEEDED(rv) && inputStream)
+        {
+          // now, copy the temp file to the offline store for the dest folder.
+          nsMsgLineStreamBuffer *inputStreamBuffer = new nsMsgLineStreamBuffer(FILE_IO_BUFFER_SIZE,
+                                                                               true,    // allocate new lines
+                                                                               false);  // leave CRLFs on the returned string
+          int64_t fileSize;
+          aFile->GetFileSize(&fileSize);
+          uint32_t bytesWritten;
+          rv = NS_OK;
+//        rv = inputStream->Read(inputBuffer, inputBufferSize, &bytesRead);
+//        if (NS_SUCCEEDED(rv) && bytesRead > 0)
+          msgParser->SetState(nsIMsgParseMailMsgState::ParseHeadersState);
+          msgParser->SetNewMsgHdr(newMsgHdr);
+          // set the new key to fake key so the msg hdr will have that for a key
+          msgParser->SetNewKey(fakeKey);
+          bool needMoreData = false;
+          char * newLine = nullptr;
+          uint32_t numBytesInLine = 0;
+          do
+          {
+            newLine = inputStreamBuffer->ReadNextLine(inputStream, numBytesInLine, needMoreData); 
+            if (newLine)
+            {
+              msgParser->ParseAFolderLine(newLine, numBytesInLine);
+              rv = offlineStore->Write(newLine, numBytesInLine, &bytesWritten);
+              NS_Free(newLine);
+            }
+          } while (newLine);
+          msgParser->FinishHeader();
+
+          nsCOMPtr<nsIMsgDBHdr> fakeHdr;
+          msgParser->GetNewMsgHdr(getter_AddRefs(fakeHdr));
+          if (fakeHdr)
+          {
+            if (NS_SUCCEEDED(rv) && fakeHdr)
+            {
+              uint32_t resultFlags;
+              fakeHdr->SetMessageOffset(curOfflineStorePos);
+              fakeHdr->OrFlags(nsMsgMessageFlags::Offline | nsMsgMessageFlags::Read, &resultFlags);
+              fakeHdr->SetOfflineMessageSize(fileSize);
+              destDB->AddNewHdrToDB(fakeHdr, true /* notify */);
+              aDstFolder->SetFlag(nsMsgFolderFlags::OfflineEvents);
+              if (msgStore)
+                msgStore->FinishNewMessage(offlineStore, fakeHdr);
+            }
+          }
+          // tell the listener we're done.
+          inputStream->Close();
+          inputStream = nullptr;
+          aListener->OnStopRunningUrl(aUrl, NS_OK);
+          delete inputStreamBuffer;
+        }
+        offlineStore->Close();
+      }
+    }
+  }
+          
+  if (destDB)
+    destDB->Close(true);
+  return rv;
+}
+
+/* append message from file url */
+/* imap://HOST>appendmsgfromfile>DESTINATIONMAILBOXPATH */
+/* imap://HOST>appenddraftfromfile>DESTINATIONMAILBOXPATH>UID>messageId */
+NS_IMETHODIMP nsImapService::AppendMessageFromFile(nsIFile *aFile,
+                                                   nsIMsgFolder *aDstFolder,
+                                                   const nsACString &messageId,  // to be replaced
+                                                   bool idsAreUids,
+                                                   bool inSelectedState,       // needs to be in
+                                                   nsIUrlListener *aListener,
+                                                   nsIURI **aURL,
+                                                   nsISupports *aCopyState,
+                                                   nsIMsgWindow *aMsgWindow)
+{
+  NS_ENSURE_ARG_POINTER(aFile);
+  NS_ENSURE_ARG_POINTER(aDstFolder);
+
+  nsresult rv;
+  nsCOMPtr<nsIImapUrl> imapUrl;
+  nsAutoCString urlSpec;
+
+  char hierarchyDelimiter = GetHierarchyDelimiter(aDstFolder);
+  rv = CreateStartOfImapUrl(EmptyCString(), getter_AddRefs(imapUrl), aDstFolder, aListener, urlSpec, hierarchyDelimiter);
+  if (NS_SUCCEEDED(rv))
+  {
+    nsCOMPtr<nsIMsgMailNewsUrl> msgUrl = do_QueryInterface(imapUrl);
+    if (msgUrl && aMsgWindow)
+    {
+      // we get the loadGroup from msgWindow
+      msgUrl->SetMsgWindow(aMsgWindow);
+    }
+
+    SetImapUrlSink(aDstFolder, imapUrl);
+    imapUrl->SetMsgFile(aFile);
+    imapUrl->SetCopyState(aCopyState);
+
+    nsCOMPtr<nsIURI> uri = do_QueryInterface(imapUrl);
+
+    if (inSelectedState)
+      urlSpec.Append("/appenddraftfromfile>");
+    else
+      urlSpec.Append("/appendmsgfromfile>");
+
+    urlSpec.Append(hierarchyDelimiter);
+
+    nsCString folderName;
+    GetFolderName(aDstFolder, folderName);
+    urlSpec.Append(folderName);
+
+    if (inSelectedState)
+    {
+      urlSpec.Append('>');
+      if (idsAreUids)
+        urlSpec.Append(uidString);
+      else
+        urlSpec.Append(sequenceString);
+      urlSpec.Append('>');
+      if (!messageId.IsEmpty())
+        urlSpec.Append(messageId);
+    }
+    
+    rv = uri->SetSpec(urlSpec);
+    if (WeAreOffline())
+    {
+      // handle offline append to drafts or templates folder here.
+      return OfflineAppendFromFile(aFile, uri, aDstFolder, messageId, inSelectedState, aListener, aURL, aCopyState);
+    }
+    if (NS_SUCCEEDED(rv))
+      rv = GetImapConnectionAndLoadUrl(imapUrl, nullptr, aURL);
+  }
+  return rv;
+}
+
+nsresult nsImapService::GetImapConnectionAndLoadUrl(nsIImapUrl *aImapUrl,
+                                                    nsISupports *aConsumer,
+                                                    nsIURI **aURL)
+{
+  NS_ENSURE_ARG_POINTER(aImapUrl);
+
+  bool isValidUrl;
+  aImapUrl->GetValidUrl(&isValidUrl);
+  if (!isValidUrl)
+    return NS_ERROR_FAILURE;
+
+  if (WeAreOffline())
+  {
+    nsImapAction imapAction;
+
+    // the only thing we can do offline is fetch messages.
+    // ### TODO - need to look at msg copy, save attachment, etc. when we
+    // have offline message bodies.
+    aImapUrl->GetImapAction(&imapAction);
+    if (imapAction != nsIImapUrl::nsImapMsgFetch && imapAction != nsIImapUrl::nsImapSaveMessageToDisk)
+      return NS_MSG_ERROR_OFFLINE;
+  }
+
+  nsCOMPtr<nsIMsgIncomingServer> aMsgIncomingServer;
+  nsCOMPtr<nsIMsgMailNewsUrl> msgUrl = do_QueryInterface(aImapUrl);
+  nsresult rv = msgUrl->GetServer(getter_AddRefs(aMsgIncomingServer));
+    
+  if (aURL)
+  {
+    nsCOMPtr<nsIURI> msgUrlUri = do_QueryInterface(msgUrl);
+    msgUrlUri.swap(*aURL);
+  }
+
+  if (NS_SUCCEEDED(rv) && aMsgIncomingServer)
+  {
+    nsCOMPtr<nsIImapIncomingServer> aImapServer(do_QueryInterface(aMsgIncomingServer, &rv));
+    if (NS_SUCCEEDED(rv) && aImapServer)
+      rv = aImapServer->GetImapConnectionAndLoadUrl(aImapUrl, aConsumer);
+  }
+  return rv;
+}
+
+NS_IMETHODIMP nsImapService::MoveFolder(nsIMsgFolder *srcFolder,
+                                        nsIMsgFolder *dstFolder, 
+                                        nsIUrlListener *urlListener, 
+                                        nsIMsgWindow *msgWindow, 
+                                        nsIURI **url)
+{
+  NS_ENSURE_ARG_POINTER(srcFolder);
+  NS_ENSURE_ARG_POINTER(dstFolder);
+
+  nsCOMPtr<nsIImapUrl> imapUrl;
+  nsAutoCString urlSpec;
+  nsresult rv;
+
+  char default_hierarchyDelimiter = GetHierarchyDelimiter(dstFolder);
+  rv = CreateStartOfImapUrl(EmptyCString(), getter_AddRefs(imapUrl), dstFolder, 
+                            urlListener, urlSpec, default_hierarchyDelimiter);
+  if (NS_SUCCEEDED(rv) && imapUrl)
+  {
+    rv = SetImapUrlSink(dstFolder, imapUrl);
+    if (NS_SUCCEEDED(rv))
+    {
+      nsCOMPtr<nsIMsgMailNewsUrl> mailNewsUrl = do_QueryInterface(imapUrl);
+      if (mailNewsUrl)
+        mailNewsUrl->SetMsgWindow(msgWindow);
+      char hierarchyDelimiter = kOnlineHierarchySeparatorUnknown;
+      nsCString folderName;
+
+      nsCOMPtr<nsIURI> uri = do_QueryInterface(imapUrl);
+      GetFolderName(srcFolder, folderName);
+      urlSpec.Append("/movefolderhierarchy>");
+      urlSpec.Append(hierarchyDelimiter);
+      urlSpec.Append(folderName);
+      urlSpec.Append('>');
+      GetFolderName(dstFolder, folderName);
+      if (!folderName.IsEmpty())
+      {
+        urlSpec.Append(hierarchyDelimiter);
+        urlSpec.Append(folderName);
+      }
+      rv = uri->SetSpec(urlSpec);
+      if (NS_SUCCEEDED(rv))
+      {
+        GetFolderName(srcFolder, folderName);
+        rv = GetImapConnectionAndLoadUrl(imapUrl, nullptr, url);
+      }
+    }
+  }
+  return rv;
+}
+
+NS_IMETHODIMP nsImapService::RenameLeaf(nsIMsgFolder *srcFolder,
+                                        const nsAString &newLeafName, 
+                                        nsIUrlListener *urlListener,
+                                        nsIMsgWindow *msgWindow, 
+                                        nsIURI **url)
+{
+  NS_ENSURE_ARG_POINTER(srcFolder);
+
+  nsCOMPtr<nsIImapUrl> imapUrl;
+  nsAutoCString urlSpec;
+
+  char hierarchyDelimiter = GetHierarchyDelimiter(srcFolder);
+  nsresult rv = CreateStartOfImapUrl(EmptyCString(), getter_AddRefs(imapUrl), srcFolder, 
+                            urlListener, urlSpec, hierarchyDelimiter);
+  if (NS_SUCCEEDED(rv))
+  {
+    rv = SetImapUrlSink(srcFolder, imapUrl);
+    if (NS_SUCCEEDED(rv))
+    {
+      nsCOMPtr<nsIURI> uri = do_QueryInterface(imapUrl);
+      nsCOMPtr<nsIMsgMailNewsUrl> mailNewsUrl = do_QueryInterface(imapUrl);
+      if (mailNewsUrl)
+        mailNewsUrl->SetMsgWindow(msgWindow);
+      nsCString folderName;
+      GetFolderName(srcFolder, folderName);
+      urlSpec.Append("/rename>");
+      urlSpec.Append(hierarchyDelimiter);
+      urlSpec.Append(folderName);
+      urlSpec.Append('>');
+      urlSpec.Append(hierarchyDelimiter);
+      nsAutoCString cStrFolderName;
+      // Unescape the name before looking for parent path
+      MsgUnescapeString(folderName, 0, cStrFolderName);
+      int32_t leafNameStart = cStrFolderName.RFindChar(hierarchyDelimiter);
+      if (leafNameStart != -1)
+      {
+        cStrFolderName.SetLength(leafNameStart+1);
+        urlSpec.Append(cStrFolderName);
+      }
+
+      nsAutoCString utfNewName;
+      CopyUTF16toMUTF7(PromiseFlatString(newLeafName), utfNewName);
+      nsCString escapedNewName;
+      MsgEscapeString(utfNewName, nsINetUtil::ESCAPE_URL_PATH, escapedNewName);
+      nsCString escapedSlashName;
+      rv = nsImapUrl::EscapeSlashes(escapedNewName.get(), getter_Copies(escapedSlashName));
+      NS_ENSURE_SUCCESS(rv, rv);
+      urlSpec.Append(escapedSlashName);
+
+      rv = uri->SetSpec(urlSpec);
+      if (NS_SUCCEEDED(rv))
+        rv = GetImapConnectionAndLoadUrl(imapUrl, nullptr, url);
+    } // if (NS_SUCCEEDED(rv))
+  } // if (NS_SUCCEEDED(rv) && imapUrl)
+  return rv;
+}
+
+NS_IMETHODIMP nsImapService::CreateFolder(nsIMsgFolder *parent,
+                                          const nsAString &newFolderName,
+                                          nsIUrlListener *urlListener,
+                                          nsIURI **url)
+{
+  NS_ENSURE_ARG_POINTER(parent);
+
+  nsCOMPtr<nsIImapUrl> imapUrl;
+  nsAutoCString urlSpec;
+  nsresult rv;
+
+  char hierarchyDelimiter = GetHierarchyDelimiter(parent);
+  rv = CreateStartOfImapUrl(EmptyCString(), getter_AddRefs(imapUrl), parent, 
+                            urlListener, urlSpec, hierarchyDelimiter);
+  if (NS_SUCCEEDED(rv) && imapUrl)
+  {
+    rv = SetImapUrlSink(parent, imapUrl);
+    if (NS_SUCCEEDED(rv))
+    {
+      nsCOMPtr<nsIURI> uri = do_QueryInterface(imapUrl);
+
+      nsCString folderName;
+      GetFolderName(parent, folderName);
+      urlSpec.Append("/create>");
+      urlSpec.Append(hierarchyDelimiter);
+      if (!folderName.IsEmpty())
+      {
+        nsCString canonicalName;
+        nsImapUrl::ConvertToCanonicalFormat(folderName.get(),
+                                            hierarchyDelimiter,
+                                            getter_Copies(canonicalName));
+        urlSpec.Append(canonicalName);
+        urlSpec.Append(hierarchyDelimiter);
+      }
+
+      nsAutoCString utfNewName;
+      rv = CopyUTF16toMUTF7(PromiseFlatString(newFolderName), utfNewName);
+      NS_ENSURE_SUCCESS(rv, rv);
+      nsCString escapedFolderName;
+      MsgEscapeString(utfNewName, nsINetUtil::ESCAPE_URL_PATH, escapedFolderName);
+      urlSpec.Append(escapedFolderName);
+
+      rv = uri->SetSpec(urlSpec);
+      if (NS_SUCCEEDED(rv))
+        rv = GetImapConnectionAndLoadUrl(imapUrl, nullptr, url);
+    } // if (NS_SUCCEEDED(rv))
+  } // if (NS_SUCCEEDED(rv) && imapUrl)
+  return rv;
+}
+
+NS_IMETHODIMP nsImapService::EnsureFolderExists(nsIMsgFolder *parent,
+                                                const nsAString &newFolderName, 
+                                                nsIUrlListener *urlListener, 
+                                                nsIURI **url)
+{
+  NS_ENSURE_ARG_POINTER(parent);
+
+  nsCOMPtr<nsIImapUrl> imapUrl;
+  nsAutoCString urlSpec;
+  nsresult rv;
+
+  char hierarchyDelimiter = GetHierarchyDelimiter(parent);
+  rv = CreateStartOfImapUrl(EmptyCString(), getter_AddRefs(imapUrl), parent, urlListener, urlSpec, hierarchyDelimiter);
+  if (NS_SUCCEEDED(rv) && imapUrl)
+  {
+    rv = SetImapUrlSink(parent, imapUrl);
+    if (NS_SUCCEEDED(rv))
+    {
+      nsCOMPtr<nsIURI> uri = do_QueryInterface(imapUrl);
+
+      nsCString folderName;
+      GetFolderName(parent, folderName);
+      urlSpec.Append("/ensureExists>");
+      urlSpec.Append(hierarchyDelimiter);
+      if (!folderName.IsEmpty())
+      {
+        urlSpec.Append(folderName);
+        urlSpec.Append(hierarchyDelimiter);
+      }
+      nsAutoCString utfNewName; 
+      CopyUTF16toMUTF7(PromiseFlatString(newFolderName), utfNewName);
+      nsCString escapedFolderName;
+      MsgEscapeString(utfNewName, nsINetUtil::ESCAPE_URL_PATH, escapedFolderName);
+      urlSpec.Append(escapedFolderName);
+
+      rv = uri->SetSpec(urlSpec);
+      if (NS_SUCCEEDED(rv))
+        rv = GetImapConnectionAndLoadUrl(imapUrl, nullptr, url);
+    } // if (NS_SUCCEEDED(rv))
+  } // if (NS_SUCCEEDED(rv) && imapUrl)
+  return rv;
+}
+
+NS_IMETHODIMP nsImapService::ListFolder(nsIMsgFolder *aImapMailFolder,
+                                        nsIUrlListener *aUrlListener,
+                                        nsIURI **aURL)
+{
+  NS_ENSURE_ARG_POINTER(aImapMailFolder);
+
+  return FolderCommand(aImapMailFolder, aUrlListener,
+                       "/listfolder>", nsIImapUrl::nsImapListFolder, nullptr, aURL);
+}
+
+NS_IMETHODIMP nsImapService::GetScheme(nsACString &aScheme)
+{
+  aScheme.Assign("imap");
+  return NS_OK; 
+}
+
+NS_IMETHODIMP nsImapService::GetDefaultPort(int32_t *aDefaultPort)
+{
+  NS_ENSURE_ARG_POINTER(aDefaultPort);
+  *aDefaultPort = nsIImapUrl::DEFAULT_IMAP_PORT;
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsImapService::GetProtocolFlags(uint32_t *result)
+{
+  *result = URI_STD | URI_FORBIDS_AUTOMATIC_DOCUMENT_REPLACEMENT |
+  URI_DANGEROUS_TO_LOAD | ALLOWS_PROXY | URI_FORBIDS_COOKIE_ACCESS
+#ifdef IS_ORIGIN_IS_FULL_SPEC_DEFINED
+  | ORIGIN_IS_FULL_SPEC
+#endif
+  ;
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsImapService::AllowPort(int32_t port, const char *scheme, bool *aRetVal)
+{
+  // allow imap to run on any port
+  *aRetVal = true;
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsImapService::GetDefaultDoBiff(bool *aDoBiff)
+{
+  NS_ENSURE_ARG_POINTER(aDoBiff);
+  // by default, do biff for IMAP servers
+  *aDoBiff = true;    
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsImapService::GetDefaultServerPort(bool isSecure, int32_t *aDefaultPort)
+{
+  nsresult rv = NS_OK;
+  
+  // Return Secure IMAP Port if secure option chosen i.e., if isSecure is TRUE
+  if (isSecure)
+    *aDefaultPort = nsIImapUrl::DEFAULT_IMAPS_PORT;
+  else    
+    rv = GetDefaultPort(aDefaultPort);
+  
+  return rv;
+}
+
+// this method first tries to find an exact username and hostname match with the given url
+// then, tries to find any account on the passed in imap host in case this is a url to 
+// a shared imap folder.
+nsresult nsImapService::GetServerFromUrl(nsIImapUrl *aImapUrl, nsIMsgIncomingServer **aServer)
+{
+  nsresult rv;
+  nsCString folderName;
+  nsAutoCString userPass;
+  nsAutoCString hostName;
+  nsCOMPtr<nsIMsgMailNewsUrl> mailnewsUrl = do_QueryInterface(aImapUrl);
+  
+  // if we can't get a folder name out of the url then I think this is an error
+  aImapUrl->CreateCanonicalSourceFolderPathString(getter_Copies(folderName));
+  if (folderName.IsEmpty())
+  {
+    rv = mailnewsUrl->GetFileName(folderName);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+  
+  nsCOMPtr<nsIMsgAccountManager> accountManager = do_GetService(NS_MSGACCOUNTMANAGER_CONTRACTID, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+  
+  rv = accountManager->FindServerByURI(mailnewsUrl, false, aServer);
+  
+  // look for server with any user name, in case we're trying to subscribe
+  // to a folder with some one else's user name like the following
+  // "IMAP://userSharingFolder@server1/SharedFolderName"
+  if (NS_FAILED(rv) || !aServer)
+  {
+    nsAutoCString turl;
+    nsCOMPtr<nsIURL> url = do_CreateInstance(NS_STANDARDURL_CONTRACTID, &rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    rv = mailnewsUrl->GetSpec(turl);
+    NS_ENSURE_SUCCESS(rv, rv);
+    rv = url->SetSpec(turl);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    url->SetUserPass(EmptyCString());
+    rv = accountManager->FindServerByURI(url, false, aServer);
+    if (*aServer)
+      aImapUrl->SetExternalLinkUrl(true);
+  }
+  
+    // if we can't extract the imap server from this url then give up!!!
+  NS_ENSURE_TRUE(*aServer, NS_ERROR_FAILURE);
+  return rv;
+}
+
+NS_IMETHODIMP nsImapService::NewURI(const nsACString &aSpec,
+                                    const char *aOriginCharset,  // ignored
+                                    nsIURI *aBaseURI,
+                                    nsIURI **aRetVal)
+{
+  NS_ENSURE_ARG_POINTER(aRetVal);
+
+  nsresult rv;
+  nsCOMPtr<nsIImapUrl> aImapUrl = do_CreateInstance(kImapUrlCID, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // now extract lots of fun information...
+  nsCOMPtr<nsIMsgMailNewsUrl> mailnewsUrl = do_QueryInterface(aImapUrl);
+  // nsAutoCString unescapedSpec(aSpec);
+  // nsUnescape(unescapedSpec.BeginWriting());
+
+  // set the spec
+  if (aBaseURI)
+  {
+    nsAutoCString newSpec;
+    aBaseURI->Resolve(aSpec, newSpec);
+    rv = mailnewsUrl->SetSpec(newSpec);
+  }
+  else
+  {
+    rv = mailnewsUrl->SetSpec(aSpec);
+  }
+
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCString folderName;
+  // if we can't get a folder name out of the url then I think this is an error
+  aImapUrl->CreateCanonicalSourceFolderPathString(getter_Copies(folderName));
+  if (folderName.IsEmpty())
+  {
+    rv = mailnewsUrl->GetFileName(folderName);
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  nsCOMPtr<nsIMsgIncomingServer> server;
+  rv = GetServerFromUrl(aImapUrl, getter_AddRefs(server));
+  // if we can't extract the imap server from this url then give up!!!
+  NS_ENSURE_SUCCESS(rv, rv);
+  NS_ENSURE_TRUE(server, NS_ERROR_FAILURE);
+
+  // now try to get the folder in question...
+  nsCOMPtr<nsIMsgFolder> rootFolder;
+  server->GetRootFolder(getter_AddRefs(rootFolder));
+  if (rootFolder && !folderName.IsEmpty())
+  {
+    nsCOMPtr<nsIMsgFolder> folder;
+    nsCOMPtr<nsIMsgImapMailFolder> imapRoot = do_QueryInterface(rootFolder);
+    nsCOMPtr<nsIMsgImapMailFolder> subFolder;
+    if (imapRoot)
+    {
+      imapRoot->FindOnlineSubFolder(folderName, getter_AddRefs(subFolder));
+      folder = do_QueryInterface(subFolder);
+    }
+
+    // If we can't find the folder, we can still create the URI
+    // in this low-level service. Cloning URIs where the folder
+    // isn't found is common when folders are renamed or moved.
+    // We also ignore return statuses here.
+    if (folder)
+    {
+      nsCOMPtr<nsIImapMessageSink> msgSink = do_QueryInterface(folder);
+      (void) aImapUrl->SetImapMessageSink(msgSink);
+
+      nsCOMPtr<nsIMsgFolder> msgFolder = do_QueryInterface(folder);
+      (void) SetImapUrlSink(msgFolder, aImapUrl);
+
+      nsCString messageIdString;
+      aImapUrl->GetListOfMessageIds(messageIdString);
+      if (!messageIdString.IsEmpty())
+      {
+        bool useLocalCache = false;
+        msgFolder->HasMsgOffline(strtoul(messageIdString.get(), nullptr, 10),
+                                 &useLocalCache);
+        mailnewsUrl->SetMsgIsInLocalCache(useLocalCache);
+      }
+    }
+  }
+
+  // if we are fetching a part, be sure to enable fetch parts on demand
+  bool mimePartSelectorDetected = false;
+  aImapUrl->GetMimePartSelectorDetected(&mimePartSelectorDetected);
+  if (mimePartSelectorDetected)
+    aImapUrl->SetFetchPartsOnDemand(true);
+
+  // we got an imap url, so be sure to return it...
+  nsCOMPtr<nsIURI> imapUri = do_QueryInterface(aImapUrl);
+
+  imapUri.swap(*aRetVal);
+
+  return rv;
+}
+
+NS_IMETHODIMP nsImapService::NewChannel(nsIURI *aURI, nsIChannel **aRetVal)
+{
+  return NewChannel2(aURI, nullptr, aRetVal);
+}
+
+NS_IMETHODIMP nsImapService::NewChannel2(nsIURI *aURI,
+                                         nsILoadInfo* aLoadInfo,
+                                         nsIChannel **aRetVal)
+{
+  NS_ENSURE_ARG_POINTER(aURI);
+  NS_ENSURE_ARG_POINTER(aRetVal);
+  *aRetVal = nullptr;
+
+  nsresult rv;
+  nsCOMPtr<nsIImapUrl> imapUrl = do_QueryInterface(aURI, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+  nsCOMPtr <nsIMsgMailNewsUrl> mailnewsUrl = do_QueryInterface(imapUrl, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  // imap can't open and return a channel right away...the url needs to go in the imap url queue 
+  // until we find a connection which can run the url..in order to satisfy necko, we're going to return
+  // a mock imap channel....
+  nsCOMPtr<nsIImapMockChannel> channel = do_CreateInstance(kCImapMockChannel, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+  channel->SetURI(aURI);
+
+  rv = channel->SetLoadInfo(aLoadInfo);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsCOMPtr<nsIMsgWindow> msgWindow;
+  mailnewsUrl->GetMsgWindow(getter_AddRefs(msgWindow));
+  if (msgWindow)
+  {
+    nsCOMPtr<nsIDocShell> msgDocShell;
+    msgWindow->GetRootDocShell(getter_AddRefs(msgDocShell));
+    if (msgDocShell) 
+    {
+      nsCOMPtr <nsIProgressEventSink> prevEventSink;
+      channel->GetProgressEventSink(getter_AddRefs(prevEventSink));
+      nsCOMPtr<nsIInterfaceRequestor> docIR(do_QueryInterface(msgDocShell));
+      channel->SetNotificationCallbacks(docIR);
+      // we want to use our existing event sink.
+      if (prevEventSink)
+        channel->SetProgressEventSink(prevEventSink);
+    }
+  }
+  imapUrl->SetMockChannel(channel); // the imap url holds a weak reference so we can pass the channel into the imap protocol when we actually run the url
+
+  bool externalLinkUrl;
+  imapUrl->GetExternalLinkUrl(&externalLinkUrl);
+  if (externalLinkUrl)
+  {
+    // everything after here is to handle clicking on an external link. We only want
+    // to do this if we didn't run the url through the various nsImapService methods,
+    // which we can tell by seeing if the sinks have been setup on the url or not.
+    nsCOMPtr <nsIMsgIncomingServer> server;
+    rv = GetServerFromUrl(imapUrl, getter_AddRefs(server));
+    NS_ENSURE_SUCCESS(rv, rv);
+    nsCString folderName;
+    imapUrl->CreateCanonicalSourceFolderPathString(getter_Copies(folderName));
+    if (folderName.IsEmpty())
+    {
+      nsCString escapedFolderName;
+      rv = mailnewsUrl->GetFileName(escapedFolderName);
+      if (!escapedFolderName.IsEmpty()) {
+        MsgUnescapeString(escapedFolderName, 0, folderName);
+      }
+    }
+    // if the parent is null, then the folder doesn't really exist, so see if the user
+    // wants to subscribe to it./
+    nsCOMPtr<nsIMsgFolder> aFolder;
+    // now try to get the folder in question...
+    nsCOMPtr<nsIMsgFolder> rootFolder;
+    server->GetRootFolder(getter_AddRefs(rootFolder));
+    nsCOMPtr <nsIMsgImapMailFolder> imapRoot = do_QueryInterface(rootFolder);
+    nsCOMPtr <nsIMsgImapMailFolder> subFolder;
+    if (imapRoot)
+    {
+      imapRoot->FindOnlineSubFolder(folderName, getter_AddRefs(subFolder));
+      aFolder = do_QueryInterface(subFolder);
+    }
+    nsCOMPtr <nsIMsgFolder> parent;
+    if (aFolder)
+      aFolder->GetParent(getter_AddRefs(parent));
+    nsCString serverKey;
+    nsAutoCString userPass;
+    rv = mailnewsUrl->GetUserPass(userPass);
+    server->GetKey(serverKey);
+    nsCString fullFolderName;
+    if (parent)
+      fullFolderName = folderName;
+    if (!parent && !folderName.IsEmpty())  // check if this folder is another user's folder
+    {
+      fullFolderName = nsIMAPNamespaceList::GenerateFullFolderNameWithDefaultNamespace(serverKey.get(), 
+                                                                                       folderName.get(),
+                                                                                       userPass.get(),
+                                                                                       kOtherUsersNamespace,
+                                                                                       nullptr);
+      // if this is another user's folder, let's see if we're already subscribed to it.
+      rv = imapRoot->FindOnlineSubFolder(fullFolderName, getter_AddRefs(subFolder));
+      aFolder = do_QueryInterface(subFolder);
+      if (aFolder)
+        aFolder->GetParent(getter_AddRefs(parent));
+    }
+    // if we couldn't get the fullFolderName, then we probably couldn't find
+    // the other user's namespace, in which case, we shouldn't try to subscribe to it.
+    if (!parent && !folderName.IsEmpty() && !fullFolderName.IsEmpty())
+    {
+      // this folder doesn't exist - check if the user wants to subscribe to this folder.
+      nsCOMPtr<nsIPrompt> dialog;
+      nsCOMPtr<nsIWindowWatcher> wwatch(do_GetService(NS_WINDOWWATCHER_CONTRACTID, &rv));
+      NS_ENSURE_SUCCESS(rv, rv);
+      wwatch->GetNewPrompter(nullptr, getter_AddRefs(dialog));
+      
+      nsString statusString, confirmText;
+      nsCOMPtr<nsIStringBundle> bundle;
+      rv = IMAPGetStringBundle(getter_AddRefs(bundle));
+      NS_ENSURE_SUCCESS(rv, rv);
+        // need to convert folder name from mod-utf7 to unicode
+      nsAutoString unescapedName;
+      if (NS_FAILED(CopyMUTF7toUTF16(fullFolderName, unescapedName)))
+        CopyASCIItoUTF16(fullFolderName, unescapedName);
+      const char16_t *formatStrings[1] = { unescapedName.get() };
+
+      rv = bundle->FormatStringFromName(
+        u"imapSubscribePrompt",
+        formatStrings, 1, getter_Copies(confirmText));
+      NS_ENSURE_SUCCESS(rv,rv);
+
+      bool confirmResult = false;
+      rv = dialog->Confirm(nullptr, confirmText.get(), &confirmResult);
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      if (confirmResult)
+      {
+        nsCOMPtr <nsIImapIncomingServer> imapServer = do_QueryInterface(server);
+        if (imapServer)
+        {
+          nsCOMPtr <nsIURI> subscribeURI;
+          // now we have the real folder name to try to subscribe to. Let's try running
+          // a subscribe url and returning that as the uri we've created.
+          // We need to convert this to unicode because that's what subscribe wants :-(
+          // It's already in mod-utf7.
+          nsAutoString unicodeName;
+          CopyASCIItoUTF16(fullFolderName, unicodeName);
+          rv = imapServer->SubscribeToFolder(unicodeName, true, getter_AddRefs(subscribeURI));
+          if (NS_SUCCEEDED(rv) && subscribeURI)
+          {
+            nsCOMPtr <nsIImapUrl> imapSubscribeUrl = do_QueryInterface(subscribeURI);
+            if (imapSubscribeUrl)
+              imapSubscribeUrl->SetExternalLinkUrl(true);
+            nsCOMPtr <nsIMsgMailNewsUrl> mailnewsUrl = do_QueryInterface(subscribeURI);
+            if (mailnewsUrl)
+            {
+              nsCOMPtr<nsIMsgMailSession> mailSession = do_GetService(NS_MSGMAILSESSION_CONTRACTID, &rv);
+              NS_ENSURE_SUCCESS(rv, rv);
+              nsCOMPtr <nsIMsgWindow> msgWindow;
+              rv = mailSession->GetTopmostMsgWindow(getter_AddRefs(msgWindow));
+              if (NS_SUCCEEDED(rv) && msgWindow)
+              {
+                mailnewsUrl->SetMsgWindow(msgWindow);
+                nsCOMPtr <nsIUrlListener> listener = do_QueryInterface(rootFolder);
+                if (listener)
+                  mailnewsUrl->RegisterListener(listener);
+              }
+            }
+          }
+        }
+      }
+      // error out this channel, so it'll stop trying to run the url.
+      rv = NS_ERROR_FAILURE;
+      *aRetVal = nullptr;
+    }
+    // this folder exists - check if this is a click on a link to the folder
+    // in which case, we'll select it.
+    else if (!fullFolderName.IsEmpty())  
+    {         
+      nsCOMPtr<nsIMsgFolder> imapFolder;
+      nsCOMPtr<nsIImapServerSink> serverSink;
+      
+      mailnewsUrl->GetFolder(getter_AddRefs(imapFolder));
+      imapUrl->GetImapServerSink(getter_AddRefs(serverSink));
+      // need to see if this is a link click - one way is to check if the url is set up correctly
+      // if not, it's probably a url click. We need a better way of doing this. 
+      if (!imapFolder)
+      {
+        nsCOMPtr<nsIMsgMailSession> mailSession = do_GetService(NS_MSGMAILSESSION_CONTRACTID, &rv);
+        NS_ENSURE_SUCCESS(rv, rv);
+        nsCOMPtr <nsIMsgWindow> msgWindow;
+        rv = mailSession->GetTopmostMsgWindow(getter_AddRefs(msgWindow));
+        if (NS_SUCCEEDED(rv) && msgWindow)
+        {
+          nsCString uri;
+          rootFolder->GetURI(uri);
+          uri.Append('/');
+          uri.Append(fullFolderName);
+          nsCOMPtr<nsIMsgWindowCommands> windowCommands;
+          msgWindow->GetWindowCommands(getter_AddRefs(windowCommands));
+          if (windowCommands)
+            windowCommands->SelectFolder(uri);
+            // error out this channel, so it'll stop trying to run the url.
+          *aRetVal = nullptr;
+          rv = NS_ERROR_FAILURE;
+        }
+        else
+        {
+          // make sure the imap action is selectFolder, so the content type
+          // will be x-application-imapfolder, so ::HandleContent will
+          // know to open a new 3 pane window.
+          imapUrl->SetImapAction(nsIImapUrl::nsImapSelectFolder);
+        }
+      }
+    }
+  }
+  if (NS_SUCCEEDED(rv))
+    NS_IF_ADDREF(*aRetVal = channel);
+  return rv;
+}
+
+NS_IMETHODIMP nsImapService::SetDefaultLocalPath(nsIFile *aPath)
+{
+  NS_ENSURE_ARG_POINTER(aPath);
+
+  return NS_SetPersistentFile(PREF_MAIL_ROOT_IMAP_REL, PREF_MAIL_ROOT_IMAP, aPath);
+}
+
+NS_IMETHODIMP nsImapService::GetDefaultLocalPath(nsIFile **aResult)
+{
+  NS_ENSURE_ARG_POINTER(aResult);
+  *aResult = nullptr;
+
+  bool havePref;
+  nsCOMPtr<nsIFile> localFile;
+  nsresult rv = NS_GetPersistentFile(PREF_MAIL_ROOT_IMAP_REL,
+                                     PREF_MAIL_ROOT_IMAP,
+                                     NS_APP_IMAP_MAIL_50_DIR,
+                                     havePref,
+                                     getter_AddRefs(localFile));
+  NS_ENSURE_SUCCESS(rv, rv);
+  NS_ENSURE_TRUE(localFile, NS_ERROR_FAILURE);
+
+  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_IMAP_REL, PREF_MAIL_ROOT_IMAP, localFile);
+    NS_ASSERTION(NS_SUCCEEDED(rv), "Failed to set root dir pref.");
+  }
+
+  localFile.swap(*aResult);
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsImapService::GetServerIID(nsIID **aServerIID)
+{
+  *aServerIID = new nsIID(NS_GET_IID(nsIImapIncomingServer));
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsImapService::GetRequiresUsername(bool *aRequiresUsername)
+{
+  NS_ENSURE_ARG_POINTER(aRequiresUsername);
+
+  *aRequiresUsername = true;
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsImapService::GetPreflightPrettyNameWithEmailAddress(bool *aPreflightPrettyNameWithEmailAddress)
+{
+  NS_ENSURE_ARG_POINTER(aPreflightPrettyNameWithEmailAddress);
+
+  *aPreflightPrettyNameWithEmailAddress = true;
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsImapService::GetCanLoginAtStartUp(bool *aCanLoginAtStartUp)
+{
+  NS_ENSURE_ARG_POINTER(aCanLoginAtStartUp);
+  *aCanLoginAtStartUp = true;
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsImapService::GetCanDelete(bool *aCanDelete)
+{
+  NS_ENSURE_ARG_POINTER(aCanDelete);
+  *aCanDelete = true;
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsImapService::GetCanDuplicate(bool *aCanDuplicate)
+{
+  NS_ENSURE_ARG_POINTER(aCanDuplicate);
+  *aCanDuplicate = true;
+  return NS_OK;
+}        
+
+NS_IMETHODIMP nsImapService::GetCanGetMessages(bool *aCanGetMessages)
+{
+  NS_ENSURE_ARG_POINTER(aCanGetMessages);
+  *aCanGetMessages = true;
+  return NS_OK;
+}        
+
+NS_IMETHODIMP nsImapService::GetCanGetIncomingMessages(bool *aCanGetIncomingMessages)
+{
+  NS_ENSURE_ARG_POINTER(aCanGetIncomingMessages);
+  *aCanGetIncomingMessages = true;
+  return NS_OK;
+}    
+
+NS_IMETHODIMP nsImapService::GetShowComposeMsgLink(bool *showComposeMsgLink)
+{
+  NS_ENSURE_ARG_POINTER(showComposeMsgLink);
+  *showComposeMsgLink = true;
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsImapService::GetFoldersCreatedAsync(bool *aAsyncCreation)
+{
+  NS_ENSURE_ARG_POINTER(aAsyncCreation);
+  *aAsyncCreation = true;
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsImapService::GetListOfFoldersWithPath(nsIImapIncomingServer *aServer, 
+                                                      nsIMsgWindow *aMsgWindow, 
+                                                      const nsACString &folderPath)
+{
+  nsresult rv;
+  nsCOMPtr<nsIMsgIncomingServer> server = do_QueryInterface(aServer);
+  if (!server) 
+    return NS_ERROR_FAILURE;
+
+  nsCOMPtr<nsIMsgFolder> rootMsgFolder;
+  rv = server->GetRootMsgFolder(getter_AddRefs(rootMsgFolder));
+
+  NS_ENSURE_TRUE(NS_SUCCEEDED(rv) && rootMsgFolder, NS_ERROR_FAILURE);
+
+  nsCOMPtr<nsIUrlListener> listener = do_QueryInterface(aServer, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+  if (!listener) 
+    return NS_ERROR_FAILURE;
+
+  // Locate the folder so that the correct hierarchical delimiter is used in the folder
+  // pathnames, otherwise root's (ie, '^') is used and this is wrong.
+  nsCOMPtr<nsIMsgFolder> msgFolder;
+  if (rootMsgFolder && !folderPath.IsEmpty())
+  {
+    // If the folder path contains 'INBOX' of any forms, we need to convert it to uppercase
+    // before finding it under the root folder. We do the same in PossibleImapMailbox().
+    nsAutoCString tempFolderName(folderPath);
+    nsAutoCString tokenStr, remStr, changedStr;
+    int32_t slashPos = tempFolderName.FindChar('/');
+    if (slashPos > 0)
+    {
+      tokenStr = StringHead(tempFolderName, slashPos);
+      remStr = Substring(tempFolderName, slashPos);
+    }
+    else
+      tokenStr.Assign(tempFolderName);
+
+    if (tokenStr.LowerCaseEqualsLiteral("inbox") &&
+        !tokenStr.EqualsLiteral("INBOX"))
+      changedStr.Append("INBOX");
+    else
+      changedStr.Append(tokenStr);
+
+    if (slashPos > 0 ) 
+      changedStr.Append(remStr);
+
+    rv = rootMsgFolder->FindSubFolder(changedStr, getter_AddRefs(msgFolder));
+  }
+  return DiscoverChildren(msgFolder, listener, folderPath, nullptr);
+}
+
+NS_IMETHODIMP nsImapService::GetListOfFoldersOnServer(nsIImapIncomingServer *aServer, 
+                                                      nsIMsgWindow *aMsgWindow)
+{
+  nsresult rv;
+
+  nsCOMPtr<nsIMsgIncomingServer> server = do_QueryInterface(aServer);
+  if (!server) 
+    return NS_ERROR_FAILURE;
+
+  nsCOMPtr<nsIMsgFolder> rootMsgFolder;
+  rv = server->GetRootMsgFolder(getter_AddRefs(rootMsgFolder));
+
+  NS_ENSURE_SUCCESS(rv, rv);
+  if (!rootMsgFolder) 
+    return NS_ERROR_FAILURE;
+
+  nsCOMPtr<nsIUrlListener> listener = do_QueryInterface(aServer, &rv);
+  NS_ENSURE_TRUE(NS_SUCCEEDED(rv) && listener, NS_ERROR_FAILURE);
+
+  return DiscoverAllAndSubscribedFolders(rootMsgFolder, listener, nullptr);
+} 
+
+NS_IMETHODIMP nsImapService::SubscribeFolder(nsIMsgFolder *aFolder,
+                                             const nsAString &aFolderName, 
+                                             nsIUrlListener *urlListener, 
+                                             nsIURI **url)
+{
+
+  return ChangeFolderSubscription(aFolder, aFolderName, 
+                                  "/subscribe>", urlListener, url);
+}
+
+nsresult nsImapService::ChangeFolderSubscription(nsIMsgFolder *folder,
+                                                 const nsAString &folderName, 
+                                                 const char *command,
+                                                 nsIUrlListener *urlListener, 
+                                                 nsIURI **url)
+{
+  NS_ENSURE_ARG_POINTER(folder);
+
+  nsCOMPtr<nsIImapUrl> imapUrl;
+  nsAutoCString urlSpec;
+  nsresult rv;
+  char hierarchyDelimiter = GetHierarchyDelimiter(folder);
+  rv = CreateStartOfImapUrl(EmptyCString(), getter_AddRefs(imapUrl), folder, urlListener,
+                            urlSpec, hierarchyDelimiter);
+  if (NS_SUCCEEDED(rv) && imapUrl)
+  {
+    rv = SetImapUrlSink(folder, imapUrl);
+    if (NS_SUCCEEDED(rv))
+    {
+      nsCOMPtr<nsIURI> uri = do_QueryInterface(imapUrl);
+      urlSpec.Append(command);
+      urlSpec.Append(hierarchyDelimiter);
+      nsAutoCString utfFolderName;
+      rv = CopyUTF16toMUTF7(PromiseFlatString(folderName), utfFolderName);
+      NS_ENSURE_SUCCESS(rv, rv);
+      nsCString escapedFolderName;
+      MsgEscapeString(utfFolderName, nsINetUtil::ESCAPE_URL_PATH, escapedFolderName);
+      urlSpec.Append(escapedFolderName);
+      rv = uri->SetSpec(urlSpec);
+      if (NS_SUCCEEDED(rv))
+        rv = GetImapConnectionAndLoadUrl(imapUrl, nullptr, url);
+    }
+  }
+  return rv;
+}
+
+NS_IMETHODIMP nsImapService::UnsubscribeFolder(nsIMsgFolder *aFolder,
+                                               const nsAString &aFolderName, 
+                                               nsIUrlListener *aUrlListener, 
+                                               nsIURI **aUrl)
+{
+
+  return ChangeFolderSubscription(aFolder, aFolderName,
+                                  "/unsubscribe>", aUrlListener, aUrl);
+}
+
+NS_IMETHODIMP nsImapService::GetFolderAdminUrl(nsIMsgFolder *aImapMailFolder,
+                                               nsIMsgWindow *aMsgWindow,
+                                               nsIUrlListener *aUrlListener,
+                                               nsIURI **aURL)
+{
+  NS_ENSURE_ARG_POINTER(aImapMailFolder);
+
+  return FolderCommand(aImapMailFolder, aUrlListener,
+                       "/refreshfolderurls>", nsIImapUrl::nsImapRefreshFolderUrls, aMsgWindow, aURL);
+}
+
+NS_IMETHODIMP nsImapService::IssueCommandOnMsgs(nsIMsgFolder *anImapFolder,
+                                                nsIMsgWindow *aMsgWindow,
+                                                const nsACString &aCommand,
+                                                const nsACString &uids,
+                                                nsIURI **aURL)
+{
+  NS_ENSURE_ARG_POINTER(anImapFolder);
+  NS_ENSURE_ARG_POINTER(aMsgWindow);
+
+  nsCOMPtr<nsIImapUrl> imapUrl;
+  nsAutoCString urlSpec;
+  nsresult rv;
+  char hierarchyDelimiter = GetHierarchyDelimiter(anImapFolder);
+  rv = CreateStartOfImapUrl(EmptyCString(), getter_AddRefs(imapUrl), anImapFolder, nullptr, urlSpec, hierarchyDelimiter);
+
+  if (NS_SUCCEEDED(rv) && imapUrl)
+  {
+    // nsImapUrl::SetSpec() will set the imap action properly
+    rv = imapUrl->SetImapAction(nsIImapUrl::nsImapUserDefinedMsgCommand);
+
+    nsCOMPtr <nsIMsgMailNewsUrl> mailNewsUrl = do_QueryInterface(imapUrl);
+    mailNewsUrl->SetMsgWindow(aMsgWindow);
+    mailNewsUrl->SetUpdatingFolder(true);
+    rv = SetImapUrlSink(anImapFolder, imapUrl);
+
+    if (NS_SUCCEEDED(rv))
+    {
+      nsCString folderName;
+      GetFolderName(anImapFolder, folderName);
+      urlSpec.Append("/");
+      urlSpec.Append(aCommand);
+      urlSpec.Append(">");
+      urlSpec.Append(uidString);
+      urlSpec.Append(">");
+      urlSpec.Append(hierarchyDelimiter);
+      urlSpec.Append(folderName);
+      urlSpec.Append(">");
+      urlSpec.Append(uids);
+      rv = mailNewsUrl->SetSpec(urlSpec);
+      if (NS_SUCCEEDED(rv))
+        rv = GetImapConnectionAndLoadUrl(imapUrl, nullptr, aURL);
+    }
+  } // if we have a url to run....
+
+  return rv;
+}
+
+NS_IMETHODIMP nsImapService::FetchCustomMsgAttribute(nsIMsgFolder *anImapFolder,
+                                                     nsIMsgWindow *aMsgWindow,
+                                                     const nsACString &aAttribute,
+                                                     const nsACString &uids,
+                                                     nsIURI **aURL)
+{
+  NS_ENSURE_ARG_POINTER(anImapFolder);
+  NS_ENSURE_ARG_POINTER(aMsgWindow);
+
+  nsCOMPtr<nsIImapUrl> imapUrl;
+  nsAutoCString urlSpec;
+  nsresult rv;
+  char hierarchyDelimiter = GetHierarchyDelimiter(anImapFolder);
+  rv = CreateStartOfImapUrl(EmptyCString(), getter_AddRefs(imapUrl), anImapFolder, 
+                            nullptr, urlSpec, hierarchyDelimiter);
+  if (NS_SUCCEEDED(rv) && imapUrl)
+  {
+    // nsImapUrl::SetSpec() will set the imap action properly
+    rv = imapUrl->SetImapAction(nsIImapUrl::nsImapUserDefinedFetchAttribute);
+
+    nsCOMPtr <nsIMsgMailNewsUrl> mailNewsUrl = do_QueryInterface(imapUrl);
+    mailNewsUrl->SetMsgWindow(aMsgWindow);
+    mailNewsUrl->SetUpdatingFolder(true);
+    rv = SetImapUrlSink(anImapFolder, imapUrl);
+
+    if (NS_SUCCEEDED(rv))
+    {
+      nsCString folderName;
+      GetFolderName(anImapFolder, folderName);
+      urlSpec.Append("/customFetch>UID>");
+      urlSpec.Append(hierarchyDelimiter);
+      urlSpec.Append(folderName);
+      urlSpec.Append(">");
+      urlSpec.Append(uids);
+      urlSpec.Append(">");
+      urlSpec.Append(aAttribute);
+      rv = mailNewsUrl->SetSpec(urlSpec);
+      if (NS_SUCCEEDED(rv))
+        rv = GetImapConnectionAndLoadUrl(imapUrl, nullptr, aURL);
+    }
+  } // if we have a url to run....
+
+  return rv;
+}
+
+NS_IMETHODIMP nsImapService::StoreCustomKeywords(nsIMsgFolder *anImapFolder,
+                                                 nsIMsgWindow *aMsgWindow,
+                                                 const nsACString &flagsToAdd,
+                                                 const nsACString &flagsToSubtract,
+                                                 const nsACString &uids,
+                                                 nsIURI **aURL)
+{
+  NS_ENSURE_ARG_POINTER(anImapFolder);
+
+  nsCOMPtr<nsIImapUrl> imapUrl;
+  nsAutoCString urlSpec;
+  nsresult rv;
+  char hierarchyDelimiter = GetHierarchyDelimiter(anImapFolder);
+  rv = CreateStartOfImapUrl(EmptyCString(), getter_AddRefs(imapUrl), anImapFolder, nullptr, urlSpec, hierarchyDelimiter);
+
+  if (NS_SUCCEEDED(rv) && imapUrl)
+  {
+    // nsImapUrl::SetSpec() will set the imap action properly
+    rv = imapUrl->SetImapAction(nsIImapUrl::nsImapMsgStoreCustomKeywords);
+
+    nsCOMPtr <nsIMsgMailNewsUrl> mailNewsUrl = do_QueryInterface(imapUrl);
+    mailNewsUrl->SetMsgWindow(aMsgWindow);
+    mailNewsUrl->SetUpdatingFolder(true);
+    rv = SetImapUrlSink(anImapFolder, imapUrl);
+
+    if (NS_SUCCEEDED(rv))
+    {
+      nsCString folderName;
+      GetFolderName(anImapFolder, folderName);
+      urlSpec.Append("/customKeywords>UID>");
+      urlSpec.Append(hierarchyDelimiter);
+      urlSpec.Append(folderName);
+      urlSpec.Append(">");
+      urlSpec.Append(uids);
+      urlSpec.Append(">");
+      urlSpec.Append(flagsToAdd);
+      urlSpec.Append(">");
+      urlSpec.Append(flagsToSubtract);
+      rv = mailNewsUrl->SetSpec(urlSpec);
+      if (NS_SUCCEEDED(rv))
+        rv = GetImapConnectionAndLoadUrl(imapUrl, nullptr, aURL);
+    }
+  } // if we have a url to run....
+
+  return rv;
+}
+
+
+NS_IMETHODIMP nsImapService::DownloadMessagesForOffline(const nsACString &messageIds, 
+                                                        nsIMsgFolder *aFolder, 
+                                                        nsIUrlListener *aUrlListener, 
+                                                        nsIMsgWindow *aMsgWindow)
+{
+  NS_ENSURE_ARG_POINTER(aFolder);
+
+  nsCOMPtr<nsIImapUrl> imapUrl;
+  nsAutoCString urlSpec;
+  nsresult rv;
+  char hierarchyDelimiter = GetHierarchyDelimiter(aFolder);
+  rv = CreateStartOfImapUrl(EmptyCString(), getter_AddRefs(imapUrl), aFolder, nullptr,
+                            urlSpec, hierarchyDelimiter);
+  if (NS_SUCCEEDED(rv) && imapUrl)
+  {
+    nsCOMPtr<nsIURI> runningURI;
+    // need to pass in stream listener in order to get the channel created correctly
+    nsCOMPtr<nsIImapMessageSink> imapMessageSink(do_QueryInterface(aFolder, &rv));
+    rv = FetchMessage(imapUrl, nsImapUrl::nsImapMsgDownloadForOffline,aFolder,
+                      imapMessageSink, aMsgWindow, nullptr, messageIds,
+                      false, EmptyCString(), getter_AddRefs(runningURI));
+    if (runningURI && aUrlListener)
+    {
+      nsCOMPtr<nsIMsgMailNewsUrl> msgurl (do_QueryInterface(runningURI));
+      nsCOMPtr<nsIImapUrl> imapUrl(do_QueryInterface(runningURI));
+      if (msgurl)
+        msgurl->RegisterListener(aUrlListener);
+      if (imapUrl)
+        imapUrl->SetStoreResultsOffline(true);
+    }
+  }
+  return rv;
+}
+
+NS_IMETHODIMP nsImapService::MessageURIToMsgHdr(const char *uri, nsIMsgDBHdr **aRetVal)
+{
+  NS_ENSURE_ARG_POINTER(uri);
+  NS_ENSURE_ARG_POINTER(aRetVal);
+
+  nsCOMPtr<nsIMsgFolder> folder;
+  nsMsgKey msgKey;
+  nsresult rv = DecomposeImapURI(nsDependentCString(uri),
+                                 getter_AddRefs(folder), &msgKey);
+  NS_ENSURE_SUCCESS(rv,rv);
+  rv = folder->GetMessageHeader(msgKey, aRetVal);
+  NS_ENSURE_SUCCESS(rv,rv);
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP nsImapService::PlaybackAllOfflineOperations(nsIMsgWindow *aMsgWindow, 
+                                                          nsIUrlListener *aListener, 
+                                                          nsISupports **aResult)
+{
+  NS_ENSURE_ARG_POINTER(aResult);
+
+  nsresult rv;
+  nsImapOfflineSync *goOnline = new nsImapOfflineSync(aMsgWindow, aListener, nullptr);
+  if (goOnline)
+  {
+    rv = goOnline->QueryInterface(NS_GET_IID(nsISupports), (void **) aResult); 
+    NS_ENSURE_SUCCESS(rv, rv);
+    if (NS_SUCCEEDED(rv) && *aResult)
+      return goOnline->ProcessNextOperation();
+  }
+  return NS_ERROR_OUT_OF_MEMORY;
+}
+
+NS_IMETHODIMP nsImapService::DownloadAllOffineImapFolders(nsIMsgWindow *aMsgWindow, 
+                                                          nsIUrlListener *aListener)
+{
+  nsImapOfflineDownloader *downloadForOffline = new nsImapOfflineDownloader(aMsgWindow, aListener);
+  if (downloadForOffline)
+  {
+    // hold reference to this so it won't get deleted out from under itself.
+    NS_ADDREF(downloadForOffline); 
+    nsresult rv = downloadForOffline->ProcessNextOperation();
+    NS_RELEASE(downloadForOffline);
+    return rv;
+  }
+  return NS_ERROR_OUT_OF_MEMORY;
+}
+
+NS_IMETHODIMP nsImapService::GetCacheStorage(nsICacheStorage **result)
+{
+  nsresult rv = NS_OK;
+  if (!mCacheStorage)
+  {
+    nsCOMPtr<nsICacheStorageService> cacheStorageService =
+      do_GetService("@mozilla.org/netwerk/cache-storage-service;1", &rv);
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    RefPtr<MailnewsLoadContextInfo> lci =
+      new MailnewsLoadContextInfo(false, false, mozilla::NeckoOriginAttributes());
+
+    rv = cacheStorageService->MemoryCacheStorage(lci, getter_AddRefs(mCacheStorage));
+    NS_ENSURE_SUCCESS(rv, rv);
+  }
+
+  NS_IF_ADDREF(*result = mCacheStorage);
+  return rv;
+}
+
+NS_IMETHODIMP nsImapService::HandleContent(const char *aContentType, 
+                                           nsIInterfaceRequestor *aWindowContext, 
+                                           nsIRequest *request)
+{
+  NS_ENSURE_ARG_POINTER(request);
+
+  nsresult rv;
+  nsCOMPtr<nsIChannel> aChannel = do_QueryInterface(request, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  if (PL_strcasecmp(aContentType, "x-application-imapfolder") == 0)
+  {
+    nsCOMPtr<nsIURI> uri;
+    rv = aChannel->GetURI(getter_AddRefs(uri));
+    NS_ENSURE_SUCCESS(rv, rv);
+
+    if (uri)
+    {
+      request->Cancel(NS_BINDING_ABORTED);
+      nsCOMPtr<nsIWindowMediator> mediator(do_GetService(NS_WINDOWMEDIATOR_CONTRACTID, &rv));
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      nsAutoCString uriStr;
+      rv = uri->GetSpec(uriStr);
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      // imap uri's are unescaped, so unescape the url.
+      nsCString unescapedUriStr;
+      MsgUnescapeString(uriStr, 0, unescapedUriStr);
+      nsCOMPtr <nsIMessengerWindowService> messengerWindowService = do_GetService(NS_MESSENGERWINDOWSERVICE_CONTRACTID,&rv);
+      NS_ENSURE_SUCCESS(rv, rv);
+
+      rv = messengerWindowService->OpenMessengerWindowWithUri("mail:3pane", unescapedUriStr.get(), nsMsgKey_None);
+      NS_ENSURE_SUCCESS(rv, rv);
+    }
+  } 
+  else 
+  {
+    // The content-type was not x-application-imapfolder
+    return NS_ERROR_WONT_HANDLE_CONTENT;
+  }
+
+  return rv;
+}