Hello,
during our pre-productive migration tests of mailboxes from Exchange on-prem to EXO I figured out that migration of resources mailboxes like meeting rooms etc, seems to behave differently.
While regular user mailboxes which where migrat are still accessible by on-prem users, emails get forwarded based on Remote Routing Address, and these mailboxes are converted from Type User to Type Office 365, resource mailboxes get deleted from Exchange on-prem after successful migration.
And therefor further on-prem users can neither invite this resource nor can they access this resource calendar anymore.
While Online Users still can book on-prem resources and can access their calendar free/busy information.
Is this by design, or is it a bug or some misconfiguration on my side?
Would that eventually mean that best practice is to migrate resource mailboxes as last ones? After all regular users got migrated, since accessibility online --> on-prem works, but not the other way round.
kind regards,
Dieter


