OK - you know you and MS sound a bit like John Kerry. He's always going on about how what the Swift Boat Veterans said was untrue, was defamatory blah, blah, blah.
OK so have at it in court.
Someone who's always saying he's going to sue you and then doesn't is either very indecisive or doesn't have much of a case. Usually, of course, it's the latter.
FYI John Kerry runs Linux on his servers just like the DNC and most democrats, and the Linux crowd is who is doing all the denying about these patent infringements. Even the FSF has sudden amnesia about their own study LOL.
Microsoft is putting the possible infringers on notice, as necessary. Red Hat for example can't say "we had no idea" at some point in the future.