Microsoft said it was given a "national security letter" filed in 2014, but came with a gag order barring the company or anyone else from unveiling the contents.
The subpoena doesn't ask a judge or a court to permit the turning over of the customer's data.
(What will move markets this quarter and how should investors position themselves ahead of time? Jim Cramer sat down with four of TheStreet's top columnists recently to get their views. Click here to listen to his latest Trading Strategies roundtable with them and read their advice for stocks, bonds, forex and gold.)