We are currently using Microsoft TMG for our front end in accessing OWA 2010.  We will be migrating to 2016 Exchange shortly.  We are also looking to implement an ADFS proxy page for our Sharepoint farm and was wondering if this would be a wise thing to do for our OWA front end as well.  Is there another more preferred option?  Round robin [dns] Owa front end or is ADFS the best way to do so then let internal DNS make the choice?  

• Edited by MMadl 13 hours 30 minutes ago

I'm not sure what you would be trying to achieve by using AD FS for on-premises Exchange.  It is not the same thing as TMG.

TMG provides forms based authentication round robin mechanism for access to OWA from the outside.  To replace that we could use ADFS [published outside for our users] with DNS internally as a soft RR.  What would u suggest to replace TMG?  

AD FS doesn't do what TMG does.

You might look into WAP.

http://blogs.technet.com/b/amitd/archive/2014/04/18/web-application-proxy-in-windows-2012-r2.aspx

Hi. There are a number of discussions in the section TMG.

TMG 2010 publish ADFS 2.2 (server 2012 R2)

Unfortunately the TMG 2010 does not officially support the publication of Exchange 2013. The last supported version of Exchange 2010.
The TMG 2010 does not support coexistence of Exchange 2010 and Exchange 2013 (2016).
Encouraged to consider other options for publishing Exchange 2010, before the migration to Exchange 2016.