Error from OCS:-Unable to retrieve instance of WMI class MSFT_SIPPoolExtData. Ensure WMI is running.

Refer to the figure below:-



You will receive this error when you're installing OCS 2007 R2 Enterprise Edition with SQL Server in the same physical machine. I'm so sorry to say "It is not supported". OCS 2007 R2 enterprise edition “MUST” be installed on another machine with SQL server. This is the basic requirement of OCS installation