My calendar disappeared this morning. I can't get it back. HELP!!!!!
I launched Thunderbird this morning and my calendar tab has disappeared. The calendar option under the "view" menu is grayed out. What happened?
Chosen solution
Try 'Events and Tasks' (Alt-N) - Calendar
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Open the Add-ons Manager. At the top right of the Thunderbird window, click the menu button > Add-ons - Extensions.
What is the status of Lightning? Please post a screenshot with the enty for Lightning visible.
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https://support.mozilla.org/kb/how-do-i-create-screenshot-my-problem
Then use the 'Browse' button underneath your reply.
Here is a screen shot
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Try 'Events and Tasks' (Alt-N) - Calendar