Microsoft just revealed the. One particular Outlook.com feature worth noting, is its support of multiple e-mail aliases. They're a great way to protect your primary e-mail address. And because you can't log in to your Outlook.com account with an alias, it adds another level of security.
Add an alias
To add a new alias to your primary Outlook.com account, click on the gears icon in the upper right-hand corner and select "More mail settings." Under the "Manage your account" section, select "Create a Outlook alias." Type the alias you want to add and choose among the outlook.com, hotmail.com, and live.com domains.
Use your alias
To send an e-mail as your alias, click on your account name, just above the To: field, then select the alias you want to use.