How do I delete recurring reminders on Outlook 2001?

One user on our network (user #1) gets daily change tape reminders sent from
our Small Business Server 2003, which I had set up when the usual person
changing the tape was out of town (user #2). However, when I reset the
reminder to notify only user #2, user #1 is still getting the daily reminders
too. They both get them now.

What is the proper way to delete a recurring reminder such as this once and
for all?

Thanks!