When you compose a new appointment or meeting request in a calendar that is located
in a public folder, if you check the option for a reminder, a
reminder is not generated. Instead, the following message is displayed:
The reminder for XXX's appointment will not appear because the item is
not in your calendar or tasks folder. Is this OK?
The reminder does not notify you of the meeting or appointment.
Because public folders are not specific to any one user or profile, there is
no one for the reminder to remind. To receive reminders to specific
appointments or meetings, use your mailbox calendar to make appointments
and schedule meetings.