Microsoft Office Communicator may no longer make daily synchronize changes to its address book Email Print Content provided by Microsoft Hotfix Download Available Symptoms You may experience that Microsoft Office Communicator no longer makes daily synchronize changes to its address book. Cause This issue occurs when an administrator manually updates the address book files on the Address Book server in a 24 hour time frame. Resolution To resolve this problem, install Update Rollup for Office Communicator 2007 R2. 978564 Description of the Communicator 2007 R2 cumulative update: March 2010 Workaround To work around this issue, delete the local client address book file.Note This behavior causes Office Communicator to download the complete address book. Status Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. Properties Article ID: 981414 - Last Review: Mar 29, 2017 - Revision: 4 Was this information helpful? Yes No Tell us what we can do to improve the article Submit Thanks! Your feedback will help us improve the support experience.