Computerworld has a discussion of how to downgrade an OEM-installed VISTA Business to Windows XP Professional. Having now tentatively installed Vista Business on two “production” systems, my Macbook under Parallels and on a test machine for Polycom PVX videoconferencing, I was hoping to have to avoid this discussion. Related to Polycom, however, they have issued an update to their PVX application, from 8.0.2 to 8.0.4 ostensibly for Vista Business. I’m not sure if this is necessary for Vista home; we’re trying to find out.