There are some discussions in WebmasterWorld and some more recent discussion in DigitalPoint Forums about an MSN update taking place still. Many Webmasters are noting changes to their rankings, most are saying they are seeing a drop in their rankings. What can be the cause?
MSN has been very transparent with SEOs since their launch. MSNdude explains on Friday afternoon;
No one is talking about a "total ban" here -- just some recent changes that tend to demote (but not remove) "spammy-looking" pages. If your site has disappeared completely, it's not because of any recent update of ours. There is a blacklist, of course, but that process hasn't changed lately. If you think your site has been blacklisted, send e-mail to email@example.com. Be sure to do a "url:" query first though -- just to make sure your page really is gone.
So, if you are not found at all in the index, after conducting an URL query, then email Microsoft. If you are found, but you don't rank as well as you did in the past, then make your pages look, less "spammy."