Virtual PC 2007 for 32 and 64 bit is Released!

Virtual PC 2007 runs on: Windows Vista™ Business; Windows Vista™ Enterprise; Windows Vista™ Ultimate; Windows Server 2003, Standard Edition; Windows Server 2003, Standard x64 Edition; Windows XP Professional; Windows XP Professional x64 Edition; or Windows XP Tablet PC Edition

https://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=04d26402-3199-48a3-afa2-2dc0b40a73b6