Per
http://technet.microsoft.com/en-us/library/aa996719.aspx, and related discussions you can deploy Exchange SP1 mailbox role with DAG on VM residing on a HA cluster node, as long as the Exchange VM does not participate in the failover cluster, but is configured as a standalone VM on that host.
When running the "Best Practice Analyzer" on such a configuration it complains about an unsupported VM configuration - Clustering. Based on the help information for the BPA it tests for "cluster service started" and "Model Key = VM" and then decides to complain.
Looks like the BPA is wrong and produces false information.
Does anybody have information about this apparent conflict?