My calendar and task list have disappeared, how do I get them back?
I have no pane on the right side of the screen with the calendar or tasks list, and no icons in the header. The solutions offered in the discussion don't help.
I have no pane on the right side of the screen with the calendar or tasks list, and no icons in the header.
The solutions offered in the discussion don't help.
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The solutions offered in the discussion don't help.
What solutions?
My calendar and task list have disappeared
At the top right of the Thunderbird window, click the menu button 
> Add-ons > Extensions
Please post a screenshot. https://support.mozilla.org/kb/how-do-i-create-screenshot-my-problem
I can't respond to the mail I received, I keep getting failure notifications, so I am attaching the screen shots here.
Lightning (the calendar extension) doesn't appear to be installed. You'll need to install Lightning. https://addons.mozilla.org/thunderbird/addon/lightning/
For more information about installing add-ons see http://xenos-email-notes.simplesite.com/416814616