Brad Smith: Government snooping potentially now constitutes an advanced persistent threat, alongside sophisticated malware and cyber attacks. Microsoft is taking steps to ensure governments use legal process rather than technological brute force to access customer data. We are expanding encryption across our services, reinforcing legal protections for our customers data, enhancing the transparency of our software code, making it easier for customers to reassure themselves that our products do not contain back doors. We will use best-in-class industry cryptography to protect these channels, including Perfect Forward Secrecy and key lengths.”]
Source: https://blogs.microsoft.com/blog/2013/12/04/protecting-customer-data-from-government-snooping/