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A Lync Online user in domain A cannot join a Live Meeting conference hosted in an OCS 2007 R2 pool in domain B when the two domains are not federated
Article ID: 2491589 - View products that this article applies to.
Consider the following scenario:
The information you entered was not recognized, or you do not have permission to join the meeting. Check the information, and then try again.
To resolve this issue, install the following cumulative update:
(http://support.microsoft.com/kb/2496882/ )Description of the update package for the Windows-based Live Meeting 2007 client: January 2011
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.