Add Or Remove Email Alias In Outlook Com. If you only have one option and you plan to remove it add a new phone or email. Pick a desired action from the available ones eg.

Select Manage email aliases. Enter a first name and last name and select Save. Sign in to your Microsoft account if prompted.
Please allow up to 24 hours for changes to your profile photo or name to go into effect.
Under Managing your account click on Aliases. On the mailbox properties page click Email Address. At the top of the page select your profile picture. Under Add an alias do one of the following.