I saw this and it got me worried. Do DAGs work with VMware virtualization?
"Server virtualization and DAGs don’t mix
Additionally, Exchange 2010’s DAGs don’t support virtual platform high availability. Microsoft does not "support combining Exchange high availability solutions (database availability groups [DAGs]) with hypervisor-based clustering, high availability or migration solutions. DAGs are supported in hardware virtualization environments provided that the virtualization environment doesn't employ clustered root servers." With the number of Exchange servers being virtualized today, this limitation can be a real deal breaker."