I have an Exchange 2003 server, and mixed Outlook 2000 and 2003
clients.  I am trying to create a custom form for a Public Folder
called 'Wheels'.  In this public folder, when a post is double
clicked, I want a custom form I created to automatically load, showing
user fields such as 'lugs', 'spacing', and 'offset'.  I can then store
an arbitrary number of wheel combinations in a public folder.

I followed these directions, and my form exists in Exchange 2003. 
When I click 'New Post' my custom form is shown, however when I double
click an existing (but created with the form) item, I get a standard
Outlook dialog.

I want to be able to click 'new' and have my custom form spawned, as
well as double click an existing item and have my custom form spawned.

Hints: Do I need a macro as the example states (I tried one to no effect).

http://www.msexchange.org/articles/Designing-Outlook-Forms-Part1.html

Please test your answer before posting.  Exchange 2003 SP1, Outlook
2000 or 2003 as a client.