I get this message with running the Best Practices Analyzer Tool in Exchange 2007 SP1 - Rollup 6
ClusteredMailboxServer' is partially configured on server apbrex2.apsu.edu. Either setup is configuring it right now or setup failed while configuring it. Please rerun setup if it isn't currently running. The cluster seems fine, and the get-clusteredmailboxserver command says it is online and lists the correct nodes.
I see a similar question in the past, but I don't have the registry key mentioned in the solution. Does anyone know how to check if there is any 'real' problem, and/or make the error go away in the tool?