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The MSExchangeMailboxAssistants.exe process crashes frequently after you move mailboxes that contain IRM-protect email messages to an Exchange Server 2010 SP1 mailbox serverArticle ID: 2604039 - View products that this article applies to. SYMPTOMSAfter you move mailboxes that contain Information Rights Management (IRM) protected email messages to a Microsoft Exchange Server 2010 Service Pack 1 (SP1) mailbox server, the Microsoft Exchange Mailbox Assistants service (MSExchangeMailboxAssistants.exe) crashes frequently. Additionally, the following event is logged in the Application log: Log Name: Application Source: MSExchange Common Date: Date Event ID: 4999 Task Category: General Level: Error Keywords: Classic User: N/A Computer: Computer Description: Watson report about to be sent for process id: Process ID, with parameters: E12, Build Type, Version Number, MSExchangeMailboxAssistants, M.E.Data.Storage, M.E.D.S.RightsManagedMessageItem.EnsureIsDecoded, System.InvalidOperationException, XXXX, Version Number. ErrorReportingEnabled: False CAUSEThis issue occurs because the conversation assistant cannot handle IRM-protected messages that are not decoded when it tries to create conversation view after the mailbox is moved. RESOLUTIONTo resolve this issue, install the following update rollup: 2645995
(http://support.microsoft.com/kb/2645995/
)
Description of Update Rollup 1 for Exchange Server 2010 Service Pack 2STATUSMicrosoft has confirmed that this is a problem in the
Microsoft products that are listed in the "Applies to" section. MORE INFORMATIONFor more information about Information Rights Management (IRM), visit the following Microsoft website: General information about Information Rights Management (IRM)
(http://technet.microsoft.com/en-us/library/dd638140.aspx)
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