If MS got its hands on OD or any other Stardock app, they'd eff it up and development would cease entirely.... it'd go on the backburner and then they'd want more apps to increase their stake, all of which would suffer the backburner fate.
Nope, let MS stick to OSes and office related stuff, and let Stardock get on with the business of customising software... ok, so some updates are a bit slow appearing (probably still ironing out all the bugs), but the bet still is that they'll be 200% up on what MS would offer up.