AppointmentItem.ReminderSet is a Boolean. Try "True" and "False" and see if
that works.

Signature
Ken Slovak
[MVP - Outlook]
http://www.slovaktech.com
Author: Absolute Beginner's Guide to Microsoft Office Outlook 2003
Reminder Manager, Extended Reminders, Attachment Options
http://www.slovaktech.com/products.htm
> In my Excel spreadsheet that I'm going to import into Outlook Calendar
> (2003), what values should I use to enable the "Reminder" checkbox? I've
> tried "Yes" "On" "0" "1" and "2" and nothing seems to work - the box remains
> unchecked. The fields are properly mapped.