I just migrated a SBS 2011 server to a 2019 Standard. All the email accounts were moved to Office 365. The old SBS Server is offline and has been for a month now. The problem is that when I try and set up Outlook for a new user it is still trying to use, and the auto discover still points to, the old SBS Exchange Server. This is a nightmare. How can I get Autodiscover to work properly?
As a footnote the even changed email domains. When they had the Exchange server all their emails were @olddomain and when they went with the new server they went with a new email domain @newdomain.