The code sample at http://www.outlookcode.com/d/code/convertfields.htm shows how to copy data from built-in fields to custom fields. It shouldn't be hard for you to reverse the logic to apply the techniques to your scenario.

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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
> Is there a utility(ies) to change an existing field's data to another
> standard field in OL2003 and/or OL2000?
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>
> Thanks, Tim