https://firstlook.org/theintercept/2015/06/04/microsoft-disk-encryption/ They worry Microsoft will betray its users again. Microsoft says it will comply with lawful requests. A company spokesperson told me that they don’t include backdoors in their products, explaining that they don’t consider building methods to bypass their security in order to comply with legitimate legal requests “backdoors.”
MS tells the NSA about security issues before they are patched so that they can exploit them. Microsoft Said To Give Zero Day Exploits To US Government Before It Patches Them NSA helped with Windows 7 development Search google for "microsoft tells nsa about vulnerabilities" there are literally hundreds of articles that have exposed this. If anyone thinks that MS doesn't work with the NSA then you are naive.