Microsoft may have acquired more than Nokia's mobile business. It has also inherited the Finnish company's legal headaches and now it will be facing the music. A judge for the US International Trade Commission has deemed that Microsoft's smartphones indeed infringe on two patents held by patent licensing outfit InterDigital. This lawsuit was first filed against Nokia almost four years ago and it is Microsoft who will now be paying the price. Worst case scenario, the ITC could ban imports of infringing Windows Phones into the US.