My sympathies, but this letter is reminscent of (and probably as effective as) a written complaint to a lion for eating too many gazelles. Steve Ballmer's competitive advantage is not technical; it is the flipping great wodge of cash that he possesses. He wouldn't be doing his job if he didn't use it. Microsoft's leader, like a lion, is amoral: if he can get away with something that benefits him, he will do it, in fact, he must do it.
Looks more like a letter from Mandriva to its users/shareholders ("look at us, Microsoft is bullying us"). Microsoft couldn't care less.