Re: But will Apple file suit against MS?
Apple has NEVER sued anyone for violating a patent that they don't use themselves. If you disbelieve that, instead of voting me down, how about providing proof? I've been asking for an example of this here for years and no one has come up with any, because they don't do it. They will sue the hell out of you if you violate a patent they are using, but they could care less about stuff they don't use in their own products.
But it may be irrelevant, as their implementation would probably be different than what is covered in the patent, and Apple and Microsoft have patent cross licensing agreements which might cover this.