I don't think the registry fix has anything to do with the message class. It just allows custom forms to show in the preview pane.
--
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

"Geoff" wrote in message ...
Very many thanks for seeing me through this.

On reflection after my last post, I felt that the registry fix wasn't
appropriate. In effect, it seems the registry fix overrides the Post Item's
MessageClass property (if that has been set to display the Post Item in a
custom form) so that the Post Item displays in the regular form. The
(rhetorical) question then arises, why bother to set the MessageClass
property in the first place?