Errors When Running OCS 2007 R2 Cumulative Update Installer

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I was installing the latest ServerUpdateInstaller.exe updates on an OCS server the other day when I got the following dialog box: 

Normally ServerUpdateInstaller runs without any issues, so I was curious what caused the error.  Looking at the ocspatchinstallerlog.txt file, I found that OCSCore.msp is the patch that reported the error.  Looking in the OCSCore.msplog I found the following lines: 

MSI (s) (74!34) [11:23:45:399]: Creating MSIHANDLE (259) of type 790531 for thread 4916
Info 27714. Stopping service OfficeScan NT Listener...
MSI (s) (74!34) [11:23:45:399]: Product: Microsoft Office Communications Server 2007 R2, Core Components -- Error 27711. Error 0x8007041c (The requested control is not valid for this service) stopping service OfficeScan NT Listener.
MSI (s) (74!34) [11:23:45:399]: Closing MSIHANDLE (259) of type 790531 for thread 4916
Error 27711. Error 0x8007041c (The requested control is not valid for this service) stopping service OfficeScan NT Listener.
CustomAction CA_StopServiceAndDependents_WinMgmt returned actual error code 1603 (note this may not be 100% accurate if translation happened inside sandbox)

It just so happened that this customer had Trend Micro OfficeScan installed on the OCS servers.  Once we disabled it and ran ServerUpdateInstaller again, everything completed successfully.