One of our server administrators tested a Catia V5 install on a unix (aix) server that had no graphics hardware using virtual frame buffer as the graphics setting. As far as I'm aware it worked fine for batch-mode inputs, though it would obviously crash if you tried to start an interactive session.
I don't think he ever tried a Windows version though.
"Pinky, are you thinking what I'm thinking?"
"Yes, Brain, but isn't that dangerous?"