Security features in Microsoft Online

https://www.microsoft.com/downloads/details.aspx?FamilyID=5736aaac-994c-4410-b7ce-bdea505a3413&DisplayLang=en

This white paper describes how the Microsoft concern for security, as defined in the Trustworthy Computing initiative, has driven key features in the design, deployment, and operation of the Microsoft Online Services environment.
Security is critical to our customers: Online services from Microsoft were built from the ground-up to be more secure by design, secure by default, and secure in operation; validated by Cybertrust Certification and SAS 70 Type II attestation.