You can change the default form in Microsoft Outlook by making changes to the Microsoft Windows registry.The registry settings specify which forms are substituted for the default Outlook form. 

Note: The following article contains instructions on how to create and modify Microsoft registry keys, caution is advised.  Custom forms may have certain limitation and could have some implications when deployed to many users. See Microsoft Knowledge Base article 241235 for further information.

The Forms Administrator utility can be downloaded from Microsoft Knowledge Base article 241235. The utility does not create the registry keys in the correct location for Microsoft office outlook 2003, 2007 or 2010. However, you can use the forms Administrator utility to create a Windows registry file and make the necessary changes. To use a Windows registry file to change the default form in Outlook 2010:

1. Download the Outlook Forms Administrator utility.

2. Run the utility, and then change the settings as you would for Outlook 2000 and 2002.

3. To save the registry settings, click Save. This also makes Export Saved Settings button available.

4. Click Export Saved Settings to save the Windows registry (.reg) file.

5. Open the .reg file in a text editor, such as Notepad.

6. The registry key paths reference9.0 which is the location for Outlook 2000 registry settings. Change all of the references of 9.0 to either 11.0, 12.0 or for use with Outlook 2010, 14.0.

7. Save the .reg file.

8. Run the .reg file on each computer where you want to change the default forum, so that the keys are added to the windows registry on that computer.