Forum Discussion
Query Regarding Changing UPN and Email Address with new Domain Name in Exchange Hybrid Environment
Hi Microsoft Tech Community, I'm currently navigating a transition within my organization where we need to change the UPN and Email Address while retaining the old email address as a secondary ad...
As the mailbox GUID won't change, the Outlook profile shouldn't either. However, the UPN is the login name for all M365 services, so this will require all users to login to any M365 service with the new UPN. Definitely one to be testing thoroughly before hand as the user experience realy depends on what M365 services are in use