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How do I restore my calendar - I didn't know it was lightning...

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Just installed the latest update for Thunderbird - did not know Lightning was my calendar - restored to earlier version of Thunderbird, but it did not bring up my calendar. How do I get it back?

Just installed the latest update for Thunderbird - did not know Lightning was my calendar - restored to earlier version of Thunderbird, but it did not bring up my calendar. How do I get it back?

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Install the matching lightning version for the Thunderbird version you are running.

https://addons.mozilla.org/en-US/thunderbird/addon/lightning/versions/