Need 'Completed' checkbox

[KZoli429]

One thing I really miss in Thunferbird is a "done" or "completed" option on the right-click menu or the edit menu. Maybe both, because there should also be a way to uncheck completion. Visually, it would be very positive if completed events and tasks would also appear on the global screen in a strikethrough style with a unique background color; i.e. a medium gray used for all completed items.

[Jon]

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