http://blogs.technet.com/b/dodeitte/archive/2012/12/02/issue-joining-live-meeting-meetings-on-lync-server-2010.aspxUpdate 1/30/13 - Lync Server 2010: January 2013 Cumulative Updates have been released which fixes this issue. You can download the latest updates here: http://support.microsoft.com/?kbid=2791665 . I ran into this issue at a customer the other day.en-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)http://blogs.technet.com/b/dodeitte/archive/2012/12/02/issue-joining-live-meeting-meetings-on-lync-server-2010.aspx#3547331Mon, 21 Jan 2013 20:54:08 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:3547331Oguzhan İlkan BORAN<p>thanks for sharing....</p> <div style="clear:both;"></div><img src="http://blogs.technet.com/aggbug.aspx?PostID=3547331" width="1" height="1">http://blogs.technet.com/b/dodeitte/archive/2012/12/02/issue-joining-live-meeting-meetings-on-lync-server-2010.aspx#3557178Fri, 18 Jan 2013 14:45:57 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:3557178Ramblings of an Exchange-Lync PFE<p>I ran into another situation that could have a big impact on your OCS to Lync migration. If you are migrating</p> <img src="http://blogs.technet.com/aggbug.aspx?PostID=3557178" width="1" height="1">http://blogs.technet.com/b/dodeitte/archive/2012/12/02/issue-joining-live-meeting-meetings-on-lync-server-2010.aspx#3546681Fri, 18 Jan 2013 13:19:09 GMTd5e57398-b9ef-4490-9955-07cbb4e4a80d:3546681Ramblings of an Exchange-Lync PFE<p>If anyone does happen to upgrade before they catch this rolling back CU7 will resolve the problem. Until we release a hotfix or include this in the next CU you either have to stay at CU6 or upgrade clients to Lync. </p> <div style="clear:both;"></div><img src="http://blogs.technet.com/aggbug.aspx?PostID=3546681" width="1" height="1">