This white paper provides information about publishing Microsoft Exchange Server 2010 using Forefront Unified Access Gateway 2010 and Forefront Threat Management Gateway 2010, including how to choose between them for different scenarios, and provides specific steps you can take to configure Forefront TMG and Forefront UAG to publish Exchange 2010.

Download the whitepaper from http://www.microsoft.com/downloads/en/details.aspx?FamilyID=894bab3e-c910-4c97-ab22-59e91421e022&displaylang=en