GPS device maker TomTom has shot back at Microsoft with a claim that Microsoft infringes on four patents in Microsoft Streets and Trips. The product is mapping software that runs on computers and can be used with a small GPS receiver that connects to a laptop. TomTom is asking for triple damages for willful infringement, since it says it had notified Microsoft about its alleged infringement.

Update: Microsoft has responded to TomTom’s countersuit “We are reviewing TomTom's filing, which we have just received.”

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