Article ID: 960367 - View products that this article applies to.
When you run the Export-Mailbox command on a Microsoft Exchange 2007 mailbox that has more than 5000 items in one folder, the command fails. Additionally, you receive the following error message:
For example, this problem occurs when you run the following command in the Exchange Management Shell:
Export-Mailbox: Error was found for <mailbox name> (<SMTP address>) because: Error occurred in the step: Moving messages. Failed to copy messages to the destination mailbox store with error: An unknown error has occurred. error code: -1056749164
Export-Mailbox -Identity <mailbox name> -IncludeFolders "\inbox" -DeleteContent -DeleteAssociatedMessages
During the processing, the involved buffer has a 32 kilobyte (KB) restriction. If the target folder has more than 5000 items, the buffer restriction is exceeded. Therefore, the problem occurs.
To resolve this problem, install Update Rollup 8 for Exchange 2007 Service Pack 1.
For more information about Update Rollup 8 for Exchange Server 2007 Service Pack 1, see the following Exchange Help topic:
Description of Update Rollup 8 for Exchange Server 2007 Service Pack 1For more information about how to obtain the latest Exchange service pack or update rollup, see the following Exchange Help topic:
How to Obtain the Latest Service Pack or Update Rollup for Exchange 2007
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Article ID: 960367 - Last Review: May 19, 2009 - Revision: 1.1