For the period July to December 2016 Microsoft received 1,000-1,499 FISA orders seeking content disclosures:
4/13/17, "Microsoft releases biannual transparency reports," microsoft.org, Steve Lippman
"Today Microsoft is releasing its most recent biannual transparency reports on the Microsoft Transparency Hub. These reports consist of the Law Enforcement Requests Report, U.S. National Security Orders Report and Content Removal Requests Report.
The Law Enforcement Requests Report and the U.S. National Security Orders Report...cover the period from July to December 2016:...
4/14/17, "Microsoft Transparency Report Shows Massive Increase in 2016 Obama Era FISA Orders," tcth, sundance
"Why would there be such a significant spike in FISA orders during the first six months of 2016?
Due to legal compliance restrictions Microsoft cannot divulge the actual number of FISA Court Orders, only the range. As you can see there was at least a doubling of requests (Prior: 0-499 ~vs~ Now: 1,000-1,499) perhaps much more.
However, simultaneous to the increase in the number of FISA orders, the requests were on fewer accounts. So FISA using agencies were seeking more total data but on a smaller number of accounts."