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Have lost calenar on todays update what next?

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Help have lost Calendar on todays update What next?

Help have lost Calendar on todays update What next?

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When I get these hiccups, and that's quite often when jumping from release to beta and back again, I uninstall the broken Lightning, restart Thunderbird and try to re-install Lightning from scratch.

If desperate I go to this page and try to find the appropriate version:

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