Why is no one mentioning the possibility that M$'s patents might be legit, novel patents that don't cover something frivolous?
Probably due to the words of a Microsoft executive. When Ballmer first started the whole "Linux violates our patents and some one has to pay" campaign people asked which patents precisely. The executive indicated that he wouldn't say as they might be challenged and invalidated. If Microsft is so sure why not tell so it can be fixed?
It is like the whole SCO fiasco claiming that Linux violated their Unix copyrights (which they have now been ruled twice in courts not to own) but they would never say what code it was out of fear that the "code would be replaced".
Both sets lawsuits seem to me to be based on the idea of never letting the alleged infringement be known and fixed so that they can collect eternal tolls based on their unsupported allegations.