I'm still looking for a way to have a task scheduled 1 day (or 2 or 3 days or a week) before an already scheduled appointment.

To give a bit more of an idea; in my voicecontact with a customer I schedule an appointment but before this appointment actually happens I need to perform some other tasks, for instance looking things up.

The thing I'm looking for is that at the moment I schedule an appointment there automaticly be scheduled a task to look things up the day before this appointment.

I understand that it is possibly to apply such a task by hand but I want to have it automated.