Change primary e-mail address of a Office 365 user or group

By: Emiley J Printer Friendly Format    

If your office 365 account has multiple domains and aliases, and one user has multiple proxy addresses then when there is always a primary email address for each user or group. To change this for any user you can run this following command.

Set-Mailbox -EmailAddresses SMTP:,,,...

Suppose your Office 365 organization and all the user IDs are in contoso.com, and

you have configured accepted domains and proxy addresses for all mailboxes in contoso.net and contoso.org. To change the primary e-mail address of a user named Kim Akers with the user ID [email protected] to [email protected] and to keep the existing proxy addresses on the mailbox, run the following command

Set-Mailbox [email protected] -EmailAddresses SMTP:[email protected],[email protected],[email protected], [email protected]

Note that SMTP has to be in Capital letters as it is case-sensitive





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