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OCS 2007 R2 users having problems viewing Microsoft Lync Server 2010 users’ presence? Check for Event ID: 11 warnings in your communicator logs.

For those who have come across my previous blog posts about Lync Server 2010 users haven’t problems viewing OCS 2007 R2 users’ presence: https://blog.terenceluk.com/2011/01/presence-issues-between-microsoft-lync.html, the problem in this post is the exact reverse where: OCS 2007 User –> viewing –> Lync Server 2010 User =

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