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On a Microsoft Exchange Server 2007 server, you may find that the IMAP service crashes intermittently. When this problem occurs, IMAP clients cannot access their mailboxes. Additionally, the following error message is logged in the event log:
For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
To resolve this problem, download Update Rollup 4 for Exchange 2007 Service Pack 1. For more information about Update Rollup 4 for Exchange Server 2007 Service Pack 1, see the following Exchange Help topic: