Respond to a NextGen Mail Linked to an Appointment
If another user links an appointment to a NextGen mail message and sends it to you with a pending action, such as a request to reschedule or cancel the appointment, you can send a mail message back to the user with a confirmation response. The confirmation response tells the requesting user that you received the request and have acted on it.
An appointment that is attached to a NextGen mail message has a status of Pending and displays in italics text in the Appointment Book. The appointment remains in pending status until the requested action is completed and a confirmation response is sent.