Calendar and tasks have disappeared from Thunderbird.

Have you tried to reinstall & update Thunderbird who worked the last time that this product when you use Windows 7 Pro. (now using Windows 10 Pro.) Restarted and stop / restarted the PC nothing works.
Calendar is listed in my training under Mozilla Thunderbird program file.
Windows updated yesterday and completed the beginning until today that may or may not be relevant.
Email Thunderbird works as it always did.

Open the Thunderbird file listed under the "calendar" Watch programs

Don't know what you're talking about. Maybe you can provide a screenshot?
In any case the calendar is in your Thunderbird profile folder, not in the program folder.

Lightning is not installed because I don't want.

Interesting. Lightning * is * the Thunderbird calendar extension.

If you want the calendar then you need to install Lightning, whether you like it or not. You can get it from AMO.
https://addons.Mozilla.org/en-us/Thunderbird/addon/lightning/

In case you have some problems to install it:
https://addons.Mozilla.org/en-us/Thunderbird/addon/lightning/

Tags: Thunderbird

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