THis is normal behavior. A message form can't be the default for any folder because messages are sent, not created for saving in a folder. Furthermore, even if you could make the form the default for the folder, that wouldn't magically change the MessageClass of incoming messages sent to that mailbox.
To do what you want, you need either an Exchange Server event sync to perform the MessageClass conversion for all mail arriving in that Inbox or a COM add-in installed on each user's machine that does the same thing on demand.

Signature
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
> Outlook and Exchange 2003
> I have added two text fields to the default message form for a fax mailbox
[quoted text clipped - 10 lines]
> something that seems so easy it's ridiculous, but I can't figure out how to
> make it happen.
Wenthe - 27 Feb 2007 19:43 GMT
Ok. So I think to myself, "What now?" Sue, is doing a MessageClass conversion
during an Exchange Server event sync covered in your book? I'm a coder, but
I haven't done alot with exchange and outlook.
> THis is normal behavior. A message form can't be the default for any folder because messages are sent, not created for saving in a folder. Furthermore, even if you could make the form the default for the folder, that wouldn't magically change the MessageClass of incoming messages sent to that mailbox.
>
[quoted text clipped - 14 lines]
> > something that seems so easy it's ridiculous, but I can't figure out how to
> > make it happen.
Sue Mosher [MVP-Outlook] - 27 Feb 2007 19:50 GMT
No, my book covers Outlook programming, not Exchange programming. A Google search is probably your best jumping off point.

Signature
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
> Ok. So I think to myself, "What now?" Sue, is doing a MessageClass conversion
> during an Exchange Server event sync covered in your book? I'm a coder, but
[quoted text clipped - 3 lines]
>>
>> To do what you want, you need either an Exchange Server event sync to perform the MessageClass conversion for all mail arriving in that Inbox or a COM add-in installed on each user's machine that does the same thing on demand.
>>
>> > Outlook and Exchange 2003
[quoted text clipped - 11 lines]
>> > something that seems so easy it's ridiculous, but I can't figure out how to
>> > make it happen.