In TB 66 how can I re-enable Calendar, if it was disabled long ago during the installation?
Could not find anything in add-ons, settings, or about:config. There is a topic on this site https://support.mozilla.org/en-US/questions/1086884 but I am not able to follow it because there is no add-on or plugin to enable or I cannot find it.
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The supported version of Thunderbird is 115.
The calendar was integrated into Thunderbird if I remember correctly in V68 and the addon lightning which provided calendar services before integration is no longer available on the addon web site. https://addons.thunderbird.net/en-US/thunderbird/addon/lightning/
I suggest you update to a supported version with an integrated calendar.
Not really interested in different versions other than 66 as I do not use them.