Virtual PC 2007

Final release of Microsoft Virtual PC 2007 available for free. 

I've used Virtual PC 2007 to run for example Windows Vista Ultimate together with the latest AutoCAD 2008 and AutoCAD Architecture 2008 and confirmed that it works to run older versions of AutoCAD like AutoCAD 2007, AutoCAD 2006, AutoCAD 2005 and AutoCAD 2004 on Vista.