http://blogs.technet.com/jkruse/archive/2009/05/14/ocs-2007-r2-virtualisation-support.aspxWe are pleased to announce official support for server virtualisation for Office Communications Server 2007 R2. We are introducing support for both a fully distributed virtualised topology across several hypervisors and for a single server virtualiseden-USCommunityServer 2.1 SP1 (Build: 61025.2)