Just about 2 years ago to the day (7/20 to be exact), Microsoft announced its acquisition of Frontbridge touting that "Fully managed services will help ensure e-mail compliance and continuity while providing customers with additional security protection from spam and virus threats."  Fast forward two years and Google acquires Postini to help enterprises "support complex business rules, information security mandates, and an array of legal and corporate compliance issues."

Frontbridge is now part of the Forefront set of services (along with Sybari and a few other acquisitions) covering the client, server, and edge.

So who is chasing whom here?