Microsoft claims that free software like Linux, which runs a big chunk of corporate America, violates 235 of its patents.
And yet it has never done anything about that. It hasn't sued all the distros to stop the operating system. They did use the claim for a bit of FUDdery, but that is not being a patent troll.
They claimed Linux violates their property which may have the effect of scaring off potential users, how is that nothing?