You can receive different kinds of Reminders:
If you select Display upcoming for, the Reminders will appear in the Notes Pane of your Day or Week View. The Upcoming Reminder will appear in the Agenda on each day before the Event occurs, beginning on the date for which you first set it.
If you select Remind me, select the unit and measurement of time specifying when you would like to receive your Reminder. You must then select the type or types of Reminder that you would like to receive. There are three types of Reminders that you can select here: Popup, E-mail or Wireless. You can select to receive more than one of these three types of Reminders. This kind of Reminder is indicated by the Bell on the status bar and on the Meeting for which you have set the Reminder.
The default you set for Reminders applies not only to Meetings you create,
but to Agenda Entries you receive from other users.
See also:
Selecting your Tasks' default settings
Selecting your Daily Notes' and Day Events'
default settings