They've now removed the Angry Birds icon and passed it off as a mistake, but for a while yesterday Microsoft must've been quaking at the thought of Rovio dispatching the Angry Birds flock their way.
Microsoft acted quickly and removed the little tile from its site, telling TechFlash that "it appears information was mistakenly posted to Microsoft's website, and has been removed." The Angry Birds icon has been removed."
Two hours after their initial tweet, Rovio offered more information on its best-selling game: "we could do a WP7 version of Angry Birds, not the issue. We have not agreed to do that (yet). Will support all relevant platforms." After discussions about the likelihood of Rovio ever doing a WP7 Angry Birds version, they then replied to someone's question, saying that "...And we haven't said we wouldn't do WP7."