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An Office Communicator 2007 R2 user does not receive instant messages from another user
Article ID: 2447995 - View products that this article applies to.
Consider the following scenario:
Note This issue does not occur if User B searches for User A by using Office Communicator 2007 R2 before User A sends the instant message.
This issue occurs because the security group or the distribution group is returned instead of the user contact when the URI of User A is searched by User B.
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
To work around this issue, use one of the following methods:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.