Issue: You would like a better understanding of the order in which Outlook goes through the Autodiscover process SCP lookup: Outlook will query Active Directory for Autodiscover information.  If that fails, Outlook begins it's "non-domain connected" logic, and will go in order down this list HTTPS root domain query: Outlook, if not domain joined, queries using the primary email address domain (right hand side of the email address). Using this domain as an example, it will search for https://enterpriseit.co/autodiscover/autodiscover.xml HTTPS Read more [...]