Microsoft Releases Its First iPhone App

"Is it possible some at Microsoft find the iPhone a more attractive platform than the software giant's own Windows Mobile? Engineers in the company's Live Labs have released the company's first application for Apple's popular smartphone--even before making it available on Microsoft's own mobile platform. Seadragon Mobile, which was added to Apple's App Store on Saturday, is a free image-browsing app that allows users to quickly "deep zoom" images while online and is intended to demonstrate what is possible with a mobile platform."

It's a pretty interesting application and a good time waster.  So why was it released on the iPhone and not on Windows Mobile?  Microsoft says it's because of the iPhone's Graphics Processing Unit.  That makes sense to me, since not every Windows Mobile phone would have a GPU as powerful as the iPhone's.  Has anybody else played with the app, and if so, what are your thoughts?