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my calendar disapeared

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I have been using Thunderbird for several months. When I opened today I could not find the calendar. The Icon is gone and I'm not sure what happened. I have been using the calendar since installation a few months ago. Please advise!!

I have been using Thunderbird for several months. When I opened today I could not find the calendar. The Icon is gone and I'm not sure what happened. I have been using the calendar since installation a few months ago. Please advise!!

Chosen solution

The Thunderbird calendar add-on is called Lightning. Open the Add-ons Manager and check the status of Lightning. Is it installed at all? If so, which version?

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Chosen Solution

The Thunderbird calendar add-on is called Lightning. Open the Add-ons Manager and check the status of Lightning. Is it installed at all? If so, which version?