Lost my existing calendar? How can I get that back?

I can't find my calendar anywhere? I tried to disable add on and restarted several times because Thunderbird crashes. Can I retrieve my calendar?

Also, I noticed that it downloads all 20 000 emails whenever I log on - is this a negative impact on its speed and how to handle this?
Thank you

One of the problems at once.
Open the Add-ons Manager.
Tools (Alt - T) - Add - ons
Look for the lightning. Is it permits? If this is not the case, turn it on. You have to restart Thunderbird can.

Tags: Thunderbird

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