You must have admin permissions in Office 365 to do this.

1. Sign in to Office 365.

2. Select Users.

   

3. On the Active users page, choose the user.

   

4. On the user's page, choose Edit.

   

5. On the Edit email addresses page, do one of the following:

   • To set an email alias as the primary address, choose Set as primary next to it.

   • To remove an email alias, select the alias, and choose Delete .

6. When you are done, choose Save.

You must have admin permissions in Office 365 to do this.

1. Sign in to Office 365.

2. Go to Admin > Users > Active users.

3. On the Active users page, do one of the following:

   • Click or tap to select the user, and then click Edit next to the user's Primary email address.

   • Select the check box next to the user, click Edit  , and then click the Email address tab.

4. On the Edit email address tab, under Other email addresses, click Add new. Type the first part of the new email alias. If you added your own domain to Office 365, you can choose the domain for the new email alias by using the drop-down list.

   Note:  The email alias must end with a domain from the drop-down list. To add another domain name to the list, see Adding additional domains to Office 365.

5. Click Add.

6. When you're done, click Save.

You must have admin permissions in Office 365 to do this.

1. Sign in to Office 365.

2. Go to Admin > Users > Active users.

3. On the Active users page, do one of the following:

   • Click or tap to select the user, and then click Edit next to the user's Primary email address.

   • Select the check box next to the user, click Edit  , and then click the Email address tab.

4. On the Edit email address tab, do one of the following:

   • To set an email address as the primary address, select the email address, and click Set as primary . Click OK to confirm that you want to set as primary email address.

   • To remove an email address, select the email address, and click Delete.

5. When you are done, click Save.

If you subscribed to the Office 365 Small Business (which is no longer available for purchase), when you create a user account, an email address is automatically assigned to the account based on the user name. This address is known as the "primary" or "reply" address. It is the email address that displays in the From box of messages sent from the account. For information about how to change a user's user name and primary email address in the Office 365 Small Business plan, see Change a user name in Office 365.