The arrest of a teenage hacker has revealed that Microsoft can track a Windows PC and its online activity through a “Global Device ID" that seems to have no easy opt-out, sparking fears about potential surveillance. Last week, the US announced it had extradited 19-year-old Peter Stokes from Europe for allegedly being a member of the notorious hacking group Scattered Spider. But the case stands out because Microsoft played a key role in linking Stokes to the suspected hacking crimes, according to...