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Imagine the complexities of modern communications condensed into a seamless experience with one address book, one voice mail, and one login across every mode of communication. That's what Microsoft is doing. We're combining e-mail, IM, voice, and video into a single, intuitive system built around people, not technology. And we're building it all into the Microsoft Office system the world knows and trusts. Companies will replace conflicting systems with a single, unified communications platform that leverages their existing data and telecommunications infrastructure. IT departments will deliver more flexible, more secure communications, with simplified infrastructure that streamlines management and reduces total cost of ownership. People-centric, integrated, secure communications that's the promise of Microsoft's vision for unified communications.

the goal of providing users a secure way to access their address books and friends lists without having to take their credentials or scrape their data

OAuth has provided a standard to unify the various proprietary schemes for delegated authorization

we can do the same thing for securely sharing address book and friends list data