Microsoft openly cooperated with the NSA and FBI US intelligence agencies under the FISA Amendment Act and allowed full access to all user data stored in the companies cloud infrastructure.
source: https://www.itproportal.com/2014/05/14/microsoft-openly-offered-cloud-data-fbi-and-nsa/
archived source: https://wellthissucks.xyz/2014/05/14/microsoft-cooperated-with-the-nsa-and-fbi-for-access-to-user-data-in-the-cloud-archived-source/