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Copy event to other lightening calendar

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I have two Lightening calendars on my Thunderbird application (Windows); how can I copy an event from one calendar into the other?

I have two Lightening calendars on my Thunderbird application (Windows); how can I copy an event from one calendar into the other?

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Select the event by clicking on it. Copy it by pressing Ctrl+C. Then paste it by pressing Ctrl+V.

Now open the duplicate by double-clicking on it, then change the calendar it is attached to.