The Microsoft Exchange team is enhancing positioning by including additional supported scenarios regarding Exchange Server 2010 running under hardware virtualization software. As of today, the following support scenarios are being updated, for Exchange 2010 SP1, and later:
The Unified Messaging server role is supported in a virtualized environment.
Combining Exchange 2010 high availability solutions (database availability groups (DAGs)) with hypervisor-based clustering, high availability, or migration solutions that will move or automatically failover mailbox servers that are members of a DAG between clustered root servers, is now supported.
Due to improvements we made in Exchange Server 2010 SP1, along with more comprehensive testing of Exchange 2010 in a virtualized environment, we are happy to provide this additional deployment flexibility to our customers. The updated support guidance applies to any hardware virtualization vendor participating in the Windows Server Virtualization Validation Program (SVVP).
Complete system requirements for Exchange Server 2010 running under hardware virtualization software can be found in Exchange 2010 System Requirements. Also, the support policy for Microsoft software running in non-Microsoft hardware virtualization software can be found here.
Kevin Allison General Manager Exchange Customer Experience