I have a scenario where I have to migrate AD forest with an exchange server. However the exchange server SMTP address should not be changed and same email address needs to be retained for all users.
I have setup cross forest migration for users and computers with ADMT. Exchange mailflow is also configured and working between source and target exchange (i created a custom accepted domain for source and target and set external email address). However I have a doubt how the Autodiscover works especially for the external users (mobile devices and not domain joined devices).
Can anyone advise how to configure auto-discovery for internal and external users in this scenario?