Mike Chan, PM for the Forefront team, breaks down the differences between security protection for Forefront Protection for Exchange (FPE), Forefront Online Protection for Exchange (FOPE), and the built-in protection which exists in Exchange 2010. We start out with a brief history of the messaging products and then dig into the details of differences between FPE, FOPE, and Exchange 2010 on the whiteboard at [4:22]. Should you run FPE alone or FPE and FOPE? Watch and decide.
Read more at source: http://edge.technet.com/Media/FPE-vs-FOPE-and-Exchange-2010–Secure-messaging-with-Forefront/