# Calendar missing from Thunderbird

**URL:** <https://discourse.mozilla.org/t/calendar-missing-from-thunderbird/4413>\
**Category:** Add-on Support\
**Created:** [October 1, 2015, 10:46pm UTC](https://discourse.mozilla.org/t/calendar-missing-from-thunderbird/4413 "2015-10-01T22:46:58Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![larrygp](https://avatars.discourse-cdn.com/v4/letter/l/f4b2a3/32.png) [@larrygp](https://discourse.mozilla.org/u/larrygp)\
**Post date:** [October 1, 2015, 10:46pm UTC](https://discourse.mozilla.org/t/calendar-missing-from-thunderbird/4413/1 "2015-10-01T22:46:58Z")

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Calendar is Gone – I opened Thunderbird email today and Calendar was not to be found? Help?

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**Author:** ![arenlor](https://sea1.discourse-cdn.com/flex001/user_avatar/discourse.mozilla.org/arenlor/32/21018_2.png) [@arenlor](https://discourse.mozilla.org/u/arenlor)\
**Post date:** [October 2, 2015, 12:31am UTC](https://discourse.mozilla.org/t/calendar-missing-from-thunderbird/4413/2 "2015-10-02T00:31:45Z")

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Are you talking about [https://addons.mozilla.org/en-US/thunderbird/addon/lightning/](https://addons.mozilla.org/en-US/thunderbird/addon/lightning/) if so, try to reinstall it.

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**Author:** ![larrygp](https://avatars.discourse-cdn.com/v4/letter/l/f4b2a3/32.png) [@larrygp](https://discourse.mozilla.org/u/larrygp)\
**Post date:** [October 2, 2015, 2:57am UTC](https://discourse.mozilla.org/t/calendar-missing-from-thunderbird/4413/3 "2015-10-02T02:57:58Z")

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Jackpot!!! Reinstalled and its all back. THANK YOU!!!  
What a relief!!!