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I can no longer see my calendar in Thunderbird, how can I get it back?

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For about the last 3 days I have totally lost my calendar on Thunderbird. There appears to be no reference to it on all the tabs on Thunderbird. Anybody any ideas?

For about the last 3 days I have totally lost my calendar on Thunderbird. There appears to be no reference to it on all the tabs on Thunderbird. Anybody any ideas?

Chosen solution

The Thunderbird calendar, Lightning, is an add on. Go to the add on tabs and click extensions. Is Lightning there but disabled. Enable it. Is it not listed at all? Enter lightning in the search box and install it.

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Chosen Solution

The Thunderbird calendar, Lightning, is an add on. Go to the add on tabs and click extensions. Is Lightning there but disabled. Enable it. Is it not listed at all? Enter lightning in the search box and install it.

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Got my calendar back, thank you. Any idea why I may have lost it in the first place?

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No I was not there. :)