"ChangeKey is required for this operation" error message in Outlook for Mac 2011 in an Exchange Server 2010 environment
Content provided by Microsoft
Applies to: Exchange Server 2010
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
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.
To resolve this issue, install the following update rollup:
2582113 Description of Update Rollup 5 for Exchange Server 2010 Service Pack 1
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about the MoveItem operation, visit the following Microsoft website: