Hello everyone,
The following post has been released by the Exchange Team Blog. It explains how to Publish Exchange Server 2013 using TMG.
Publishing Exchange Server 2013 using TMG - Exchange Team Blog - Site Home - TechNet Blogs
http://blogs.technet.com/b/exchange/archive/2012/11/21/publishing-exchange-server-2013-using-tmg.aspx
Have a great weekend,
João Ribeiro