The Forefront Server Protection product team made new documentation available for Forefront Protection 2010 for Exchange Server, or FPE for short. The documents describe the big picture on how FPE protects your Exchange servers and how to develop a scanning strategy.
The documentation, which is titled Protecting your Exchange servers and is located in the Planning and Architecture section, tries to describe some best practices for deployment and configuration of FPE without compromising performance.
The documentation can be found here.