MS09-056 may stop OCS services

after applying the update above on my OCS R2 Edge server and restart it, I get a strange event in the Office Communications Server log:

Event ID: 12299

Description:The service is shutting down due to an internal error.
Error Code: C3E93C23 (SIPPROXY_E_INVALID_INSTALLATION_DATA)Cause: Check the previous entries in the event log for the failure reason.Resolution:Check the previous event log entries and resolve them. Restart the server. If the problem persists contact Product Support Services.

and the following one as well:

Event ID: 12290

Description:The evaluation period for Microsoft Office Communications Server 2007 R2 has expired. Please upgrade from the evaluation version to the full released version of the product.

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That was funny! I was sure that I am using licensed copy of the product, so what is the problem.
I found the KB974571, which state clearly the following:

"Services that are required by Communications Server are not started after you install this update and then restart a computer that is running any of the following versions of Communications Server:
Live Communications Server 2005 (LCS)
Live Communications Server 2005 SP1
Office Communications Server 2007 Enterprise edition (OCS)
Office Communications Server 2007 Standard edition
Office Communications Server 2007 R2 Enterprise edition
Office Communications Server 2007 R2 Standard edition
Office Communicator 2007 Evaluation version only*
Office Communicator 2007 R2 Evaluation version only*
Office Communicator 2005 Evaluation version only*"

MS had released a HotFix to resolve this issue.

after running the fix, the service start normally.