Some years ago, I had a programmer create an add-in to Outlook 2003 for me that generated an appointment reminder email that is sent out automatically.
In Outlook 2003, the process of creating a follow-up email started by opening the appointment, scrolling to the bottom of the appointment page where the "Contact" field could be selected. That step gave the add-in access to the contact's email address.
Although you might think that using the "scheduling" feature of Outlook might accomplish the same thing, it did not.
Although the add-in mostly works in Outlook 2007, since the "Contact" field isn't available within an appointment form, I can't adjust old appointments nor set up new ones to receive a followup.
I think what I need is to be able to have the Outlook Appointment form adjusted to show the "Contact" field, but I do not know how to do that.