Email Aliases: Changing Your “From” Address In Hotmail/Outlook/Live

Open your email, click the “settings” (cog wheel) button and choose More mail settings

In the Managing your account section, choose Your email accounts.

Choose the button marked Add a send-only account.

Type in your new email address, and click Send verification email.

You will receive an automated email.  Follow its instructions to confirm your address, and then you’ll be set.  Whenever you want to send an email “from” the new address, select it from the dropdown list when you compose your message.