Do you use Outlook 2000? If so this TechRepublic Outlook tip from 9/20/2000 should help:
"Presents your OUTLOOK TECHMAIL
MAKE YOUR CUSTOM FORMS THE DEFAULT If you've been designing custom forms, there may come a point when you want to substitute your custom form for the default form in an Outlook folder. In previous versions of Outlook, you were basically out of luck--there was no easy way to do it. Outlook 2000 brings you this capability--but it makes you earn it.
To substitute a custom form, you need to modify the registry. Follow these steps:
1. Open the Registry Editor. 2. Find the following key: HKEY CURRENT USER\Software\Microsoft\Office\9.0\Outlook 3. Add a new subkey named Custom Forms. 4. In the Custom Forms key, add another new subkey named Read. 5. In the Read key, create a new string value with the name of the form you want to replace (for example, IPM.Contact). 6. After creating the new string value, select it and choose Edit | Modify.7. Enter the name of the custom form you want to substitute (for example, IPM.MyContactForm).
The next time you open an object of that type, Outlook should use your custom form.
You may have noticed that this change is made to the HKEY CURRENT USER key, so if there are multiple users of the machine with their own logons and profiles, the change won't affect all the users. You'll need to make the change for each, perhaps by exporting and then importing the registry key, to distribute the change to other users."
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Change default mail form
How can I make the new form my personal default mail form??