I have a 2010 Exchange server that has an autodiscover A record in the local DNS settings which point to my internal Mail server's IP and a UCC SSL certificate that is correctly pointing external mobile and remote devices to my mail server which also references this autodiscover.
OWA works perfectly across all remote devices, iPad, Smartphones.
For some reason I can configure the Mail.app in Windows 10 in a non-domain joined computer but when I try to connect using Outlook 2016 I have no joy.
I don't want to remove my autodiscover from DNS settings and fritz any computers from being able to connect.
Any ideas would be appreciated.