Article ID: 971078
An Automatic Update download is not initiated on a computer that is running Microsoft Office Communicator 2007 R2 build 3.5.6907.9.
Downloads of new Office Communicator bits are not initiated when a Client Version Control (CVC) response is received for a build of Office Communicator. If the version of Office Communicator is 3.5.6907.0009, and the CVC filter is set to <3.5.6907.00013, the response is received from the rule that is triggered on the server. However, the client download is not initiated against the URL that is received.
To resolve this issue, apply the update that is described in the following Microsoft Knowledge Base article:
(http://support.microsoft.com/kb/971083/ )Description of the Communicator 2007 R2 hotfix rollup package: May 2009
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.