Microsoft has published a whitepaper on publishing Exchange 2010 with their latest products, Forefront TMG and UAG. The whitepaper walks you through the entire process of using either Forefront TMG or UAG to publish Exchange 2010.
It starts by helping you decide whether to use Forefront TMG or UAG, makes sure you get the terminology understood, then provides step by step instructions to configure the environment. A “must read” document if you are thinking of using the latest Forefront products for publishing Exchange 2010.
Download the whitepaper here