Notes From the Field:

I was recently asked to assist an ongoing project with understanding some complex mail routing and identity scenario’s which had been identified during planning for an upcoming mail migration from an external system into Exchange Online.
New User accounts were created in Active Directory for the external staff who are about to be migrated. If we were to assign the target state, production email attributes now, and create the exchange online mailboxes, we would have a problem nearing migration.… [Keep reading] “Complex Mail Routing in Exchange Online Staged Migration Scenario”