Resorted to using this service to reverse publish OWA and Autodiscover for a customer with no funding for Application Delivery Controller.
You can just alter the syntax of the URL rewrite rule to consolidate the two core services with the match pattern: “mail.yourdomain.ca|autodiscover.yourdomain.ca” as seen below:
The setup of the farm is fairly generic, no one can really substantiate which is optimal so for the most part it will be default settings:
Health test URL is: https://mail.yourdomain.ca/owa/healthcheck.htm
I used Pass Through for Proxy
For something free, it works relatively well as far as distributing the load and health detection.
Block ECP from being exposed to public Internet.
Add a new blank URL filtering rule in URL Rewrite