See screenshots here of VS Orcas in Vista Ultimate:

http://auxonoxua.blogspot.com/2007/03/wpf-aero-effects-in-visual-studio-team.html

I didn't do anything, I just installed it as normal, clicking "Allow Access" as prompted.  UAC is set in Vista Ultimate to "home" mode for networking.  I'm GUESSING that Business etc... only allow the "Business" mode.