Manage your account aliases
You can use multiple email addresses, like your personal and professional email, with your Microsoft account. Each of these is called an alias, and you can use any of them to sign in and to communicate with others through Microsoft services, like Outlook.com.
Your account's primary alias is displayed on your Microsoft devices (such as a Windows PC, Xbox, or Windows Phone), and you can choose a different alias to be the primary one at any time. Learn more about account aliases.
Account alias
p.258@windons.com (primary alias)
Remove
For security reasons, you need to verify your primary alias before you can add another alias.