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Lightning 5.4 Requires Restart
Organize your schedule and life's important events in a calendar that's fully integrated with your Thunderbird email. Manage multiple calendars, create your daily to do list, invite friends to events, and subscribe to public calendars.
About this Add-on
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Lighting 188.8.131.52 for Thunderbird 38 is available here
Lightning also supports older versions of Thunderbird like 24 or 31, please see the complete version history for details.