"Microsoft yesterday filed a suit against Tom Tom, claiming that the company violated eight patents. Redmond claims that it has spent the past year trying to reach an agreement with the GPS device manufacturer, filing the suit as a last resort. Three of the eight alleged patent violations pertain to Tom Tom's use of Linux, the first time Microsoft has filed a suit over that OS. Adds TechFlash, "Microsoft says open-source software is not the intended focal point of the action. Five of the alleged patent violations relate to proprietary software." "