The IMAP service crashes and event error 4999 occurs on a computer that is running Exchange Server 2007

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Article ID: 971431 - View products that this article applies to.
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Consider the following scenario:
  • The user used the Transporter Suite to migrate their folders and items from an external IMAP server to A Microsoft Exchange Server 2007 server.
In this scenario, the IMAP service crashes every 5 minutes. The IMAP service keeps crashing either until the user deletes their calendar folder or if they try to download all the messages in the folder. When this problem occurs, the following event errors are logged:

Event Type: Error
Event Source: MSExchange Common
Event Category: General
Event ID: 4999
Watson report about to be sent to dw20.exe for process id: <ID>, with parameters: E12, c-RTL-x86, <version number>, M.E.Imap4, M.E.D.Storage, M.E.D.S.ItemToMimeConverter.WriteMimePart, System.NullReferenceException, f120, <version number>.  ErrorReportingEnabled: False

Event ID : 4999
Category : None
Source : MSExchange Common
Type : Error
Message :
Watson report about to be sent to dw20.exe for process id: <id>, with parameters: E12, c-buddy-RTL-AMD64, <version no>, M.E.Imap4, M.E.D.Storage, M.E.D.S.ImapItemConverter.GetHeaders, System.NullReferenceException, e084, <version number>. ErrorReportingEnabled: False


When the transporter suite migrates the calendar items from some external IMAP servers, it creates calendar items in Exchange with the message class IPM.NOTE. When the IMAP client tries to download these messages, some mime parts are not generated during content conversion. This causes the service to crash. Either the service will crash for every message that the client tries to download, until all messages are tried, or the calendar folder is deleted.


To resolve this problem, install the following update rollup:
971534 Description of Update Rollup 1 for Exchange Server 2007 Service Pack 2


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information, visit the following Microsoft Web site:


Article ID: 971431 - Last Review: November 19, 2009 - Revision: 1.0
  • Microsoft Exchange Server 2007 Enterprise Edition
  • Microsoft Exchange Server 2007 Standard Edition
kbsurveynew kbexpertiseinter kbfix kbhotfixrollup kbqfe KB971431

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