"ChangeKey is required for this operation" error message in Outlook for Mac 2011 in an Exchange Server 2010 environment

Symptoms

Assume that a Microsoft Outlook for Mac 2011 user moves an item, and then changes the category of the item in a Microsoft Exchange Server 2010 environment. When Exchange Server synchronizes items with the Outlook for Mac 2011 client, the user occasionally receives the following error message:

Error
Could not synchronize record: <Message Name> to Exchange server: <Exchange Server Name>
Details
ChangeKey is required for this operation.
Error code
-19946


Cause

This issue occurs because the MoveItem operation in the Microsoft Exchange Web service returns an incorrect ChangeKey property of a moved item when Exchange Server synchronizes items with Outlook for Mac 2011 clients.

Resolution

To resolve this issue, install the following update rollup:

2582113 Description of Update Rollup 5 for Exchange Server 2010 Service Pack 1

Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More Information

For more information about the MoveItem operation, visit the following Microsoft website:

General information about the MoveItem operationFor more information about the ChangeKey property, visit the following Microsoft website:

General information about the ChangeKey property

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