Add or remove an email alias in Outlook.com - Outlook
Existing Hotmail, Live, Outlook.com, and MSN addresses can't be added as aliases, and you can't add an alias that is already associated with another Microsoft account. It isn't possible to create a new alias using @hotmail, @live.com, or @msn.com. If a Hotmail address is important to you, you need to sign out and create a new account.
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