I am working on Exchange 2010 Cross-forest migration project and as far as to my knowledge the normal behavior for autodiscover and outlook configuration is as following:
1- Once we finish migrating user to the target forest, Autodiscover works only if the UPN domain is added to the user's proxy address list, or if SCP is exported and imported to target AD.
2- Outlook will require user to create new profile after user is migrated. what I mean by this is that user can't close and open outlook to find it working with the new configuration (New Target Forest server) ?
Is there anything that can change this behavior where user can still use their old outlook profile without taking any action .. just as if it's a normal intra-forest migration?