Office 365 change primary email address without changing login

Clicking the Edit link to the right of a user's login name will open a dialog that allows you to change their username, add email aliases, and replace the username with any existing alias. To change the login name, simply create a new alias and then use the Set as primary button to replace the user's login name with the newly created email alias:

Office 365 change primary email address without changing login

Changing a username and aliases

While there's no bulk option to change user login names, there is a bulk option to change their login domain, which can be useful in cases where you added users with the *.onmicrosoft.com domain and need to change them over ...

How do I change my email address in Outlook without creating a new account?

Open Outlook and select File. Use the dropdown under Account Information to select the account you want to change. Select Account Settings. Select the type of information you want to change.

Can you change the main email on Microsoft account?

If you need to change that primary email address, here's how: Go to Manage how you sign in to Microsoft. To add an email address, select Add email. This can be any email address (e.g., Gmail, Outlook.com, Hotmail, Yahoo, etc.).

Can I change my email address without creating a new account?

Most email services do not allow you to change your existing email address. In order to change your email address, you'll need to create a new account. You can use the same email service you've been using, or you can take this opportunity to switch to a service that better meets your needs.