Some parts of Microsoft are adopting Atom/APP ... other groups remain somewhat vague and non-committal. It would be great for the SharePoint team to make a clear statement of direction on support for Atom and AtomPub. Given the growing deployment estimates of MOSS - which for some odd reason implemented only RSS - it seems that someone should commit to fixing an architectural "oops" .
But, put succinctly, Google + Microsoft = AtomPub wins. To paraphrase Dave Winer, the act of putting aside ego and saying a competitor's API is good enough, and that you're going to support it, is a brave and important act in the world of technology. That makes this convergence particularly exciting.