Your Hotmail.com, Live.com, or MSN.com email address works on Outlook.com—there's no need to change your address or get a new one. However, if you want to use an @outlook.com address, the best way is to add an alias to your existing account.
An alias is an additional email address that uses the same inbox, contact list, and account settings as the primary alias. You can sign in to your account with any alias—they all use the same password. You can send email from an alias whether you’re using Outlook.com, a mail app like Outlook or devices such as a phone.
You can create up to ten new aliases per year, for an overall maximum of ten. Deleting an alias removes it from the overall count, but not the yearly limit.
Note
Rather than renaming your primary alias, we recommend you add a new alias with the email address you want.
Some places, like Windows 8 and Xbox 360 will only show your primary alias, but you can sign in with any alias.
You can create an alias using an existing email address from other providers such as Gmail, Yahoo! Plus, or AIM Mail, as long as you haven't used the address to create a Microsoft account.