I am sure I can hear the “it’s about time” calls before they are even said. Putting that aside the support is available for Exchange 2010 SP1 and beyond.
From the Exchange Team:
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).
See the link below for more details.