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Could Poser Pro work on a Ubuntu system?  I've been thinking of upgrading from my XP system, but frankly Vista scares me.

Why would Vista scare you? All of the problems people have with Vista stem from either poor hardware or lack of understanding of the tools such as UAC and Ready Boost and Superfetch.
Or all of the above.

But Vista as an operating system is rock solid, and particularly the 64 bit version runs all my apps better, faster, and more efficiently, particularly if you're loaded to the gills with RAM and have new, high quality hardware. That's the real problem - in discussions with people who have Vista trouble, you often discover they're trying to use crap hardware from 1977.  ;-)

Now's not a time to be updating to Vista anyway though, with Windows 7 on the near horizon, which will be all the good things about Vista, but with more improvements.

Anyhow, I had Ubuntu on a different PC for a while, and as 12 Rounds said, yeah at least Poser 7 worked OK. I never really put it to any real tests though, since I really only wanted to learn the O/S, not use it for graphics.