In a previous diatribe, we pointed out how Microsoft, by enforcing patents it purchased from Rockstar Consortium (patents it did not develop and does not practice), has become one of the patent trolls it so vigorously lambastes. But since Rockstar Consortium has now filed a patent infringement lawsuit against Google and several cellphone manufacturers, that makes Rockstar a patent troll, too!
In fact, Rockstar fits the classic definition of a patent troll. Rockstar did not develop the patented technology it is now asserting. It purchased the patents from Nortel. And Rockstar does not practice the patents it is enforcing since Rockstar produces no products or services.