https://forums.autodesk.com/t5/autocad-forum/operating-systems/m-p/5454746#M344961 So I have a second machine, the same make and model as the first,<BR />running a very similar OS: Windows 7 Ultimate - Service Pack 1<BR />(32-bit).<BR /><BR />The other software that I run on both the Windows 7 Home Premium<BR />(64-bit) machine and the above-described one, seems to not<BR />discriminate at all between them.<BR /><BR />So AutoCAD r 12 being 16-bit, would likely run better on my 32-bit<BR />machine, when/if I purchase this old release?<BR /><BR />Or must it have a 16-bit OS only, in order to run?<BR /><BR />I am sure that this is a much more commonplace question than you are<BR />trying to characterize it. OS's are $ 300.00 brand-new, while<BR />Autodesk has consistently priced the latest releases of its<BR />full-capability AutoCAD product upwards of 5 X this figure. Or in the<BR />1990's, wasn't it closer to $ 4,000.00??<BR /><BR />So given those economic factors, I guess that it would be very common<BR />to find users running older versions of AutoCAD with a new OS.<BR /><BR />Especially since OS upgrades benefit the functionality of everything<BR />else the user is running, while AutoCAD is highly specialized.<BR /><BR />Sincerely,<BR /><BR /><BR /><BR /><BR />Jack Nelson Mon, 29 Dec 2014 19:28:05 GMT Anonymous 2014-12-29T19:28:05Z