If you're using the news.microsoft.com server, you'll only see
Microsoft-sponsored newsgroups, but your ISP may host a newsserver. For
example, my ISP is Indigo, so I have access to the news.indigo.ie server.
If MSN doesn't offer access to usenet groups other than their own, I'd
suggest trying Newsguy. They give access to virtually *all* usnet
groups, for a very reasonable price. Even though my ISP does offer
newsgroups, I prefer the service that Newsguy offers.