So I got my setup working with Essentials as my DC and a separate box running Exchange Server 2013. Integration of Essentials with Exchange Server works great. Mail flow works fine. My problem is accessing OWA externally from the internet. I set my Virtual Directories to use the same URL's and it works fine internally.
You mentioned using a smart reverse proxy. I installed ARR according to MS TechNet article (http://technet.microsoft.com/en-us/library/jj200172.aspx
) Is there more information on configuring the reverse proxy? I'm guessing this has to be done in IIS with HTTP re-direct?
I have only 1 NIC and 1 public IP address from TW Cable.