No. But they can go after every patent is raised against them. This is the primary reason patents are mostly talk -- sure, MS can claim that Linux infringes a

No. But they can go after every patent is raised against them. This is the primary reason patents are mostly talk -- sure, MS can claim that Linux infringes a hundred of their patents. It probably infringes some of those, and some of the ones it infringes are probably even valid. But actually testing it in court would put the patent portfolio at risk -- and at least for now, they have valued not putting their patents at risk more than they have valued attacking their competitors.