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Can I recover Lightning Calendar Data outside of Lightning?

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When my Thunderbird Portable was updated to 60.0, my calendar disappeared. I need to retrieve the calendar, but there is no compatible Lightning release. Help!

When my Thunderbird Portable was updated to 60.0, my calendar disappeared. I need to retrieve the calendar, but there is no compatible Lightning release. Help!

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See if this help article for Lightning can fix things. https://support.mozilla.org/en-US/kb/calendar-updates-issues-thunderbird