Under Edit ▸ Preferences ▸ Calendar and Tasks ▸ Reminders you can select those calendars for which you want to receive reminder notifications. If you do not select a calendar, you will not receive reminders for any events in this calendar. You can also define whether to show a reminder for every appointment and for every birthday and anniversary.
Apart from the general settings you can also set up reminders in the appointment editor for certain appointments only:
Click Options ▸ Reminders or press the Reminder button in the toolbar.
From the dropdown menu, choose either one of the available default options when to show a notification reminder, or choose Customize.
In case of Customize, the reminder can be a popup, a sound played, or a program ran. You can also define whether the reminder should be repeated.
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