You cannot change the name of any built-in field.

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Sue Mosher, Outlook MVP
Author of
Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx
> Outlook 2003 Contacts has 4 'user fields' labeled 'User Field 1' through
> 'User Field 4'. Is it possible to change the field label?