On the surface, the investigation was routine.
Federal agents persuaded a judge to issue a warrant for a Microsoft email account they suspected was used for drug trafficking.
But U.S.-based Microsoft kept the emails on a server in Ireland. Microsoft said that meant the emails were beyond the warrant's reach. A federal appeals court agreed.
Late last month, the Trump administration asked the Supreme Court to intervene.
The case is among several legal clashes that Redmond, Washington-based Microsoft and other technology companies have had with the government over questions of digital privacy and authorities' need for information to combat crime and extremism....