Changing your default domain in Office 365
When you add new users to Office 365 a default email address will be assigned based on what the default domain is set to. To change the default domain
- Go to your organization’s Office 365 profile by doing one of the following:
- If you’re using Office 365 Small Business, on the Admin page, in the upper right, click your organization’s name.
- Otherwise, go to Admin > Office 365, and then, in the upper right, click your organization’s name.
- Choose a new default domain, and then save your changes.