Five years ago, US law enforcement served Microsoft a search warrant for emails as part of a US drug trafficking investigation. In response, Microsoft handed over data stored on American servers, like the person\u2019s address book. But it didn\u2019t give the government the actual content of the individual\u2019s emails, because they were stored at a Microsoft data center in Dublin, Ireland, where the subject said he lived when he signed up for his Outlook account.