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A Lync 2010 user cannot join a Lync Online meeting that is created by a user in another organization
Article ID: 2703312 - View products that this article applies to.
Consider the follow scenario:
This issue occurs because a Lync 2010 user who is not in a federated organization is not recognized as an anonymous user. Therefore, the user's client is disconnected from the Lync Server 2010 server.
To resolve this issue, install the following cumulative update:
(http://support.microsoft.com/kb/2701664/ )Description of the cumulative update package for Lync 2010: June 2012