Reminder Countdown

Is there a way to display a reminder countdown (ie, 3 min. reminder, 2 min.
reminder, 1 min. reminder) in a single calender display prompt? For instance,
I have a user who is constantly on the phone and they'd like an OL2003
calender reminder setup that they've seen past coworkers have Outlook display
an appointment reminder that alerts them by displaying a single reminder that
counts down and alerts them by the minute upto the actual appointment time.
Is this possible? How? Thanks in advance.