Article ID: 981414 - View products that this article applies to.
You may experience that Microsoft Office Communicator no longer makes daily synchronize changes to its address book.
This issue occurs when an administrator manually updates the address book files on the Address Book server in a 24 hour time frame.
To resolve this problem, install Update Rollup for Office Communicator 2007 R2.
(http://support.microsoft.com/kb/978564/ )Description of the Communicator 2007 R2 cumulative update: March 2010
To work around this issue, delete the local client address book file.
Note This behavior causes Office Communicator to download the complete address book.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.