We are migrating our mailboxes from one forest to another. We are having some issues with existing Outlook profiles. On an existing Outlook profile, after the mailbox is migrated and the SRV record changed to the new server, the client gets the notification about the change made by the administrator, restarts Outlook, gets the Autodiscover redirect warning, gets the prompt for the credentials, then Outlook is trying to connect to the server for 5 minutes then is in the Disconnected state.
When a new profile is created, the Autodiscover works just fine, and the profile is created. If I run a repair on an existing profile, the Autodiscover works just fine and the profile is created.
Looks like it's reaching the Autodiscover.xml, but not able to change the settings on an existing profile, but it's applying the settings just fine for a new or repaired profile.
Any idea what could cause this?