Yes, you can do this with an Outlook VBA macro, writing code to update the value of the MessageClass property to point to your published form. See http://www.outlookcode.com/d/newdefaultform.htm

--
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

"JonMulder" wrote in message ...
I've created a form with additional drop-down boxes and new fields. It work
when ADDING new contacts. But I want the Custom Form to be the default for
contacts previously entered before the creation of the Custom Form.

How do I do this? Does it require VB code? I'm rather savvy with VB, but
simply don't know where in Outlook I "start" the VB processing. Would it be
a macro?

Thanks,
Jonathan Mulder