Article ID: 2449148 - View products that this article applies to.
Consider the following scenario:
To fix this problem, install the following cumulative update:
(http://support.microsoft.com/kb/2291453/ )Description of the cumulative update package for Communicator 2007 R2: November 2010
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
(http://go.microsoft.com/fwlink/?LinkId=151500)for other considerations.