Calendar Notification Bug If Thunderbird Not Running
I have run into a calendar notification bug when Thunderbird is not executing. This started about a month ago and may be due to changes in the 140esr release (I was on 128esr previously).
Suppose I set an appointment for tomorrow at 9pm and ask the calendar to notify me a day in advance. If Thunderbird is executing at 9pm on day before, this works fine. If Thunderbird is not active, the notification is never made when I open Thunderbird after 9 pm on the day before the appointment.
This problem also occurs if I Snooze the notification and do not have Thunderbird running when the snooze period is completed. If does work if Thunderbird is open at the time of Snooze completion.
I have tested this on two different computers, a desktop and notebook, both running Windows 10. Currently running Thunderbird 140.2.0esr.
I have missed two appointments when Thunderbird calendar did not warn me about them.
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选择的解决方案
Turn it back on via the menu '☰' → Settings → Calendar → Reminders and then check "Show missed reminders for writable calendars". This should bring back the warnings you expect, after you restart Thunderbird.
Thanks for the help. That cleared up problem and showed all of the past reminders I have missed over the last month. I'm not sure how that box became unchecked. I haven't visited Calendar Settings in many years.