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diff --git a/mailnews/base/public/nsIMsgAccount.idl b/mailnews/base/public/nsIMsgAccount.idl
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+++ b/mailnews/base/public/nsIMsgAccount.idl
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+/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+#include "nsIMsgIncomingServer.idl"
+#include "nsIMsgIdentity.idl"
+
+interface nsIArray;
+
+/**
+ * An account consists of an incoming server and one or more
+ * outgoing identities. An account is identified by a key,
+ * which is the <account> string in the account preferences,
+ * such as in mail.account.<account>.identities.
+ */
+
+[scriptable, uuid(84181351-4ec8-4ca8-8439-5c68cc591177)]
+interface nsIMsgAccount : nsISupports {
+
+  /// Internal key identifying itself
+  attribute ACString key;
+
+  /// Incoming server stuff
+  attribute nsIMsgIncomingServer incomingServer;
+
+  /// Outgoing identity list (array of nsIMsgIdentity's)
+  readonly attribute nsIArray identities;
+
+  /// The default identity for this account.
+  attribute nsIMsgIdentity defaultIdentity;
+
+  /// Add a new identity to this account
+  void addIdentity(in nsIMsgIdentity identity);
+
+  /// Remove an identity from this account
+  void removeIdentity(in nsIMsgIdentity identity);
+
+  /// Clear all user preferences associated with an account.
+  void clearAllValues();
+
+  /// Name in javascript
+  AString toString();
+
+  /**
+   * Create the server, with error returns.
+   *
+   * Normally each valid account also has a valid server.
+   *
+   * If an extension that creates a server type failed to load, then we
+   * may have an existing account without a valid server. We don't want
+   * to simply delete that account, as that would make the user re-enter
+   * all of the account information after what may be a temporary
+   * update glitch. But we also don't want to leave junk lying around
+   * forever. So what we do is note the time when we first noticed
+   * that the server was unavailable. After a period of time set
+   * in a preference, if the server is still unavailable then delete
+   * the associated account.
+   *
+   * Accounts with invalid server are not shown in any way by the account
+   * manager. But if the server becomes available (for example if an extension
+   * is loaded), then the account will reappear when accounts are loaded.
+   *
+   * Preference definitions:
+   *
+   * mail.server.serverN.secondsToLeaveUnavailable
+   * mail.server.serverN.timeFoundUnavailable
+   *
+   * secondsToLeaveUnavailable: is set by the extension to indicate the
+   * delay, in seconds, between first detection that a server is
+   * unavailable, and the time it can be deleted. This should be set
+   * by the extension when the server is created. If missing, treat as 0.
+   * A typical value would be 2592000 (30 days)(24 hr/day)(3600 seconds/hr)
+   *
+   * timeFoundUnavailable: is set by core code the first time that a
+   * server is detected as unavailable, using now() converted to seconds.
+   * If that time + secondsToLeaveUnavailable is exceeded, core code may
+   * delete the server and its associated account (though for now we default
+   * to the previous behavior, which is to just delete the account).
+   *
+   * @throws NS_ERROR_NOT_AVAILABLE if the server component type could not
+   *           be created
+   *         NS_ERROR_ALREADY_INITIALIZED if the server is already created
+   *         (Other errors may also be possible)
+  */
+  void createServer();
+};