http://blogs.technet.com/larsnakkerud/archive/2008/09/22/exchange-og-virtualisering.aspxThe Exchange team recently released guidance for their workload in a virtual environment – this is accessible from http://technet.microsoft.com/en-us/library/cc794548.aspx - they are now developing a v2 based on the feedback they get for this.en-USCommunityServer 2.1 SP1 (Build: 61025.2)