You need to publish your custom contact form, then see http://www.outlookcode.com/d/newdefaultform.htm

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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
>I am trying to add new fields on my contact card but am unable to apply those
> new fields to ALL the contacts. How do I apply them to all the contacts and
> how to I make those new changes default whenever I need to add a new contact?