You could start by creating a public folder in the Public Folders hierarchy on your Exchange Server , adding new fields with the Field Chooser, and setting the view to use in-cell editing so you can add items right in the view. From there, you could expand into more views and a custom form to add more functionality.
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Sue Mosher, Outlook MVP
Author of Configuring Microsoft Outlook 2003
and Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers