Article ID: 983215 - View products that this article applies to.
A blank window opens unexpectedly when you start Microsoft Office Communicator 2007 R2. The blank window disappears when you exit Office Communicator 2007 R2.
To resolve this problem, apply the update package for Office Communicator 2007 R2 that is described in the following Microsoft Knowledge Base article:
(http://support.microsoft.com/kb/978564/ )Description of the cumulative update package for Communicator 2007 R2: April 2010
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.