http://192.168.2.20/blogs/doverton/archive/2006/07/13/Virtualising-SBS-2003---the-low-down.aspxThis question was asked internally and I thought the information was worth sharing, so thanks to Mark Stanfill for providing the answer: SBS 2003 is supported in virtual environments. The only unsupported component is ISA 2004, which (for rather obviousenCommunityServer 2008.5 SP2 (Build: 40407.4157)