Microsoft TechNet - Windows XP Professional Newsgroups

Microsoft public newsgroups are great places to exchange ideas with others and discuss common issues. You can read and write messages using an NNTP-based newsreader such as Microsoft Outlook® Express. You can also use our Web-based newsreader to access all the Windows server-related newsgroups.

At least, they SAY they're great, but is their opinion on their site about what's there so good. They're not known for fantastic objectivity. (They're their there are homonyms)