It's Stealth. Firefox had Clint Eastwood stealing a Mach 6 capable MiG-31 "Firefox" that was invisible to radar and whose weapon systems were controlled by thought. Stealth featured EDI ("Eddie"), an Unmanned Combat Air Vehicle whose AI starts evolving uncontrollably after taking a lightning strike.
In order to do that someone has to have your MS account login and password, as well as either access to your MS account's email address or your cell phone. A new machine doesn't get sync'd until you enter a code you receive from one of those two paths.