I've been trying out windows phones in several stores. The reps never had the windows marketplace credentials so I always had to use my Live ID in order to try out various free apps. I always reset the phones in the end, or so I thought. Just a few minutes ago I received an email confirming a wp app purchase I never made. I am afraid some store I have gone to still has my credentials on a display phone. I can't seem to figure out who to contact abour this. I also don't ever remember putting in my CC information into a windows Live account. Is there a way to remotely log out off all phones I've ever signed into? What else do I need to do?