http://blogs.technet.com/mapblog/archive/2008/08/20/microsoft-support-policies-and-recommendations-for-exchange-servers-in-hardware-virtualization-environments.aspxThis topic provides the Microsoft support policies for running currently supported versions of Microsoft Exchange Server in production in a hardware virtualization environment. This topic also provides recommendations for running Exchange Server in productionen-USCommunityServer 2.1 SP1 (Build: 61025.2)