Change a user name and email address in Office 365

You may need to change someone's Office 365 user name if, for example, they get married and their last name changes. Changing a person's Office 365 user name also changes their email address and Skype for Business display name.

Change a user name and email address in the Office 365 admin center preview

You must be an Office 365 admin to do these steps.

  1. Sign in to Office 365 with your work or school account.

  2. Go to the Office 365 admin center.

  3. Choose Users.

    Click on User.

  4. On the Active Users page, select the user name you want to edit.

    Choose the user name you want to change.

  5. Next to the person's Email address, choose Edit.

    Next to the primary email address, choose Edit.

  6. In the Alias box, type a new email for the person, and then choose Add.

    Type a new email address and then choose Add User

  7. Now you'll see two email addresses for the user. Choose the new one and then choose Set primary.

  8. You'll see a big yellow warning that you're about to change the person's email address. Select Save, and then Close.

  9. Next to the person's display name, choose Edit.

    Next to the person's display name, choose Edit.

  10. Type a new name for the person and then choose Save.

    Type a new name for the person and choose Save.

  11. Tell the user the following info:

    • What their new user ID is. They’ll need it to sign in to Office 365

    • If they are using Skype for Business Online, tell them they will need to reschedule any Skype for Business Online meetings, and they will need to tell their external contacts to update the old contact info.

    • If their password changed too, tell them they will be prompted to enter the new password on their mobile device on or it won't sync.

You must be an Office 365 admin to do these steps.

  1. Sign in to Office 365 with your work or school account.

  2. Go to the Office 365 admin center.

  3. Go to Users > Active users.

  4. Select the user you want to edit, and click Edit Edit .

  5. Select the Details tab, and change the user name.

  6. Complete your changes, and then select Save.

  7. Tell the user the following info:

    • What their new user ID is. They’ll need it to sign in to Office 365

    • If they are using Skype for Business Online, tell them they will need to reschedule any Skype for Business Online meetings, and they will need to tell their external contacts to update the old contact info.

    • If their password changed too, tell them they will be prompted to enter the new password on their mobile device on or it won't sync.

Changing the user name updates the users's primary email address, which is the same as the work or school account that they use to log into Office 365. The user's previous primary email address is retained as an additional email address. We strongly recommend that you don't remove the old email address.

Some people will likely continue to send email to the person's old email address and deleting it may result in NDR failures. Office 365 will automatically route it to the new one. Also, do not reuse old SMTP email addresses and apply them to new accounts. This can also cause NDR failures or delivery to an unintended mailbox.

It might take up to 24 hours for this change to take effect across all services. After the change has taken effect, the user will have to sign in to Outlook, Skype for Business and SharePoint with their updated user name, so be sure to tell them about this change.

To learn how to change a user name in Active Directory, see Rename a user account. But before you go, there are two situations to be aware of:

  • The user account you want to change is for the Exchange Online plan

    OR

  • The user account is an on-premises Exchange recipient that is directory-synced to the cloud

In these situations, an SMTP address in the tenant.onmicrosoft.com namespace is automatically assigned to the cloud account. This is known as the MOERA, and it cannot be modified or removed.

For a directory synched user, the alias used in the address is taken directly from the alias that is synchronized from the on-premises user account. You can change the on-premises alias and it will not change the MOERA.

It can be assigned as either the primary or as a secondary SMTP address, and it is possible to switch between the two. The typical scenario where it will be assigned as primary is:

  • You are directory syncing a user account to the cloud and

  • The user has neither a primary SMTP address nor a UPN suffix that is in a verified domain on the Office 365 tenant.

This email address is visible on the user's contact card from the server-side address list and the locally cached Outlook offline address book.

See Also

Reset a user's password

Add additional email addresses to a user in Office 365

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