Test a Form in Run Time
Forms customized with form regions
You cannot test forms that you customize with form regions from inside Outlook. Instead, you must save the form as an .ofs file, update the add-ins that are used with the form regions, and then restart Outlook. For more information, see How to: Create a Form Region.
Forms customized with form pages
To switch the form between design mode and run mode (that is, the way the form appears when it is used) do the following. In the Forms Designer, on the Developer tab, in the Form group, click Run This Form.
Note You can test the form outside the Microsoft Outlook design environment by opening a new instance of the form.
Type information in the form, send or post it, and then open the form to make sure that it behaves as expected.