That information should be available in the Tools | Forms | Choose Form dialog for all your published forms.
If you want to see the class used by individual items, add the Message Class field to any view.

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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
> How can I find out what the message class is on a custom form in Outlook 2002?
> In Outlook 2000, I go into Tools, Forms, choose Change Forms and my existing
> items converter window pops up and it is there that I see what message class
> is being used but in Outlook 2002 the Change Form is not an option (only
> Design and choose) so I can't see the actual message class?