Symptoms
Consider the follow scenario:
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You sign in to Microsoft Lync 2010 in a Lync Server 2010 environment that has the cumulative update for Lync Server 2010 that was released in February 2012 installed.
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Anonymous user access is enabled in the environment.
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You create a Lync Online meeting.
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You invite a Lync 2010 user to join the meeting. The user's Lync 2010 client has the cumulative update for Lync 2010 that was released in April 2011 or a later cumulative update installed. Additionally, the user is in a Lync Server 2010 organization that is not federated with your organization.
In this scenario, the user cannot join the meeting.
Cause
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.
Resolution
To resolve this issue, install the following cumulative update:
2701664 Description of the cumulative update package for Lync 2010: June 2012