Wea are going to be upgrading our computers to lenovo 64 bit work stations over the next 5 to 6 weeks and going to Inventor/AutoCAD 2012. My question is two fold. First in 2012 how far back can I save? We still have suppliers that are using AutoCAD 2007. Second is can we run a 32 bit version of AutoCAD 2009 on a 64 bit computer?