New document on the security features of Microsoft Online Services:
… 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.
The Business Productivity Online Suite is a set of subscription-based enterprise software services hosted by Microsoft and sold with partners. The services operate within a complete ecosystem of features and capabilities designed to meet and in many cases to exceed the security and availability goals that you have for your business applications. …
Download : Microsoft.com