Have an issue where we have an Exchange 2013 Server only External users Connect to, It is a small hosting server so the domains have SRV Records pointing to a name on the Cert
If you try to setup Devices i.e. iPhone using auto discover it does not work it just takes you to the screen where you have to add more information like Server Name etc., if you do this it will work fine.
if I add and auto discover A Record to their domain and point it to the exchange server, then Auto discover will work but then they will get Cert Issues in Outlook.
so it seems that the Auto discover Part is not working with SRV Records???