"Communicator could not retrieve calendar or Out of Office information from Exchange Web Services"

After Moving a Mailbox to exchange 2010, Microsoft Office Communicator 2007 Client reports the following Intergration Warning.

"Communicator could not retrieve calendar or Out of Office information from Exchange Web Services" 

Fix is to Apply the Following Hotfix

http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=1ad57f8f-78f7-45f6-a8c0-805936f46645

Detail

http://support.microsoft.com/?kbid=2028885