An error occurs when you try to replicate conference directory data from Windows Management Instrumentation (WMI) to the back-end server. This issue occurs when you deploy Microsoft Lync Server 2010 and Microsoft Office Communications Server 2007 R2 in the same forest. Additionally, the following event is logged in the Application logs:
To resolve this problem, install the following cumulative update:
2404547 Description of cumulative update for Office Communications Server 2007 R2: November, 2010
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.