Under Tools > Services > click on your email account. Right there on the General Tab you will see at the bottom, "Reply Address" Put in your address. If you have more than one account within Outlook and the other email address shows up, then you need to change the Delivering option. For this, go to Tools > Services > Delivery. In the bottom box, make sure the email that you want shown as the reply is the first one listed.
Sidney
sidney@tsisc.com