@fanbaby: "What's sauce for the Goose is sauce for the Gander".
If MS are sued for anti-competitive actions, then so should everyone else who acts anti-competitively. Imagine you peed on your neighbour's lawn and they sued you, then the neighbour on the other side peed on your lawn; wouldn't you think it would be unfair for them to get away with it if you didn't?
EDIT: My argument above is purely based on personal morals, but we mustn't forget that MS is a publicly owned company, so they have to do everything they legally can to ensure a level market with their competitors (and if they do something illegal, they deserve to be sued).
EDIT, EDIT: I'm not saying I don't see the irony, but suggesting that MS cannot morally make this argument is stretching credulity.