See http://www.slipstick.com/contacts/addauto.htm for various ways to save senders or recipients as new contacts automatically, depending on your version and configuration of Outlook.

Signature
Sue Mosher, Outlook MVP
Author of Configuring Microsoft Outlook 2003
http://www.turtleflock.com/olconfig/index.htm
and Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx
>I am using OL2003 and I do not seem to be able to figure out how to add
> senders' email addresses to my contact list or address book when I reply to
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>
> gfr92y at yahoo dot com