Typical MS thinking. They want to take the competition head on and try to compete but not offer full compatibility to all platforms. At least they are going to support OS X, but only the latest. Take Adobe, they support Windows, OS X, Solaris and Linux. They have most of the user base covered. Once again MS has big ideas but small support. This is going to be like when you couldn’t watch videos on the web as almost everyone used wmv. When Flash supported videos it changed everything as for the most part, everyone could view them. MS wants to bring back the dark days.