Collaberation
I was recently refered to this site, Groove.net, I downloaded the software and was up and running working with a couple of friends in a shared workspace in a matter of a couple of minutes. Much of it is very familiar, as there is much in common with IM packages these days. A Cursory check on google indicates that the people behind Groove.net are in talks with Microsoft, check out this link, http://www.shared-spaces.com/blog/2005/03/microsoft_acqui.html.
Also check out the following link as well, directly from the horses mouth, http://www.microsoft.com/presspass/press/2005/mar05/03-10GroovePR.mspx