Exchange 2010 OWA gateway

Hi
I have a Exchange 2010 cluster of three servers, all three with all roles. As of now we also have a TMG 2010 acting as aproxy for OWA, Active Sync and Outlook Anywhere.
That means clients connects to the TMG and the TMG forward the requests to the internal servers.

I want to get read of the TMG but how do I handle it's role? What are my options? Just pick one the servers in the cluster, do a NAT-1NAT to an external IP and let clients connect to it?? Or can I configure our Watchguard XTM to handle like the TMG?
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Bes4dminAsked:
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Darshana JayathilakeSystem EngineerCommented:
if you want to remove TMG, there are few options

1. Configure direct NAT/PAT to your public ip address to email server

ex- mail.test.com(220.2.2.2) >> 192.168.2.2

2. install Windows 2012 R2 Server and configure web application proxy
(https://technet.microsoft.com/en-us/library/dn280944.aspx) this is the replacement of reverse proxy feature in TMG 2010. Configure your nat to web application proxy

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