How to Migrate from One Microsoft 365 Domain to Another
Question details
The user wants to change user email addresses to a new domain within the same Microsoft 365 tenant while keeping all licenses, Outlook data, and OneDrive files intact.
- Product
- Microsoft 365
- Device & OS
- not provided
- Scenario
- Updating the primary domain suffix for existing users in a Microsoft 365 environment.
- Observed behavior
- Users need a seamless transition to a new domain address without losing access to their current emails, cloud files, or requiring new subscription licenses.
Ensure that your new domain has been successfully added, verified, and set up in the Microsoft 365 admin center before attempting to change any user email addresses.
Update the Domain for Existing Users
The most efficient method is to change the domain suffix for existing users. This preserves all Outlook data, OneDrive files, and licenses without requiring a manual migration.
Because Microsoft 365 licenses are assigned to user accounts rather than domains, simply updating a user's primary email address to the new domain keeps their account intact.
When you change the address, the old email address automatically becomes an alias, ensuring the user continues to receive emails sent to the previous domain.
Log in to the Microsoft 365 admin center using an account with Global Administrator privileges.
In the left navigation menu, go to Users, and then select Active users.
Click on the name of the user whose domain you want to change to open their properties panel.
Under the Account tab, click on 'Manage username and email'. Add a new alias using the newly verified domain.
Click the three dots next to the new domain alias and select 'Change to primary email'. Save your changes.
Create Separate Accounts and Migrate Data Manually
Use this method if organizational policies require creating entirely new user accounts rather than updating existing ones.
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Frequently Asked Questions
Do I need to buy new Microsoft 365 licenses when switching domains?
No. Licenses are assigned to users, not domains. If you change the existing user's primary email address to the new domain, they keep their current license and no new purchase is required.
Why is Outlook showing an error after moving to the new domain?
If you created entirely new accounts instead of renaming existing ones, the new accounts might not have licenses assigned yet. Ensure the new account has a valid Microsoft 365 license with Exchange Online enabled.
Will I lose my OneDrive files when switching to a new domain?
As long as you change the domain suffix on the existing user account within the same tenant, all OneDrive files, Outlook data, and SharePoint permissions remain perfectly intact.
Can I remove the old domain from Microsoft 365 immediately?
Before removing the old domain, you must ensure that no users, groups, or aliases are still using it. Once all addresses have been updated to the new domain, you can safely remove the old one.
