I am in process of buying new computers that will run Revit in Windows7 64 bit, but I dont want to invest in newer autocad and still use my autocad 2005 on these computers, as we are phasing out autocad for Revit.  Are there any issues with Running autocad 2005 32 bit, in windows 7 64 bit under XP mode?  I know they say there are no issues, but what about in real world applciation?  Has anyone else done this?