Binary package hint: evolution
I find it rather easy to miss a calendar reminder in Evolution. It appears that Evolution, 1) only reminds via notification icon, which is not as noticeable as a pop-up window. Only after one clicks on the notification icon does a pop-up come on the screen for a more noticeable reminder. However, it's too easy to miss the notification icon, which means one may never get an opportunity to see the actual pop-up reminder. 2) If ones computer is not actually ON when the reminder is scheduled to remind, the window of opportunity passes and one never sees the reminder. For example, set a reminder for 15 minutes, then turn computer off for 16 minutes. Turn computer back on, reminder does not activate. 3) Once an event is past, Evolution reminder is automatically dismissed. Even if one is late for an appointment, it is still helpful to receive the reminder, but the way Evolution's reminders work, once the event time hits, the reminder will never remind you again.
In contrast, the calendaring system of Thunderbird's Lightning extension will 1) automatically pop up a very noticeable reminder on the screen without any user intervention, 2) pop up the reminder even if you turn your computer on after the reminder was set to activate, and 3) will persist in reminding you even past the appointment time, until you explicitly "dismiss" the appointment yourself. It will never dismiss an appointment without your consent.
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