Don't know about problems with sharing with other versions of Windows, but I had trouble retrieving files from the server (see thread under CAD Admin ....'XP conflicts with Proe2002' or something like that!). They took ages to load, along with symbol files and drawings. I ended up putting my files back onto my own hard drive and, although this solved the problem, I now have to back up my own files. (Brian, if you're reading this, IT still haven't made their mind up about the software you recommended! Grr....).