Overview
This article will describe how to change the primary address of an Office 365 mailbox. This can be used in the case where a staff member is being replaced with another and you wish to keep the same license, files and email.
Instructions
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Login to the 365 admin panel for at https://portal.office.com
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Access the admin Center by clicking the menu on the top left and selecting admin:
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Select the user and press "manage username":
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Change the username as to the new email account.
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Optionally, you can also add the old username as an alias to the new account. To do so, select "Managed email aliases".
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Then, add the old username in as an alias:
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Select "Manage contact information":
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Update the First name, last name and Display name for the new user.
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Change the password and you're good to go.