hammersley,
In the full version of MS Outlook 2003 with multiple e-mail addresses, all of your mail, from all accounts you have set up, come to the inbox. But if you want to "send" mail from one of the other e-mail identities (accounts), you access that option from with in the "New Mail" window. What I mean is, act like your composing a new message, When your in the "New Mesage Window" just to the right of the send button there should be an "Accounts" drop down button. Click on this button to select from which account you want this e-mail to be sent.
I have 3 accounts set up on mine, and that is how mine works. I have MS Outlook 2003.
NAUIdvr1