I just tried to install "Exchange2003-KB926666-v2-x86-ENU.exe" (KB 926666) on one of my passive cluster node. And it says " Setup has detected that Cluster Service is running on this computer. You must manually shutdown all dependent resourc

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Q: I just tried to install "Exchange2003-KB926666-v2-x86-ENU.exe" (KB 926666) on one of my passive cluster node. And it says " Setup has detected that Cluster Service is running on this computer. You must manually shutdown all dependent resources using the Cluster Admin
A: You will want to follow the procedure in support.microsoft.com/kb/328839 for applying patches to Exchange 2003 Cluster Servers.