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Lightning data all gone

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Hi All, I have lost all data in my Lightning calendar. "Home" calendar appointments, along with those coming from my Google calendar are all gone. I see that Thunderbird did an update on Feb. 5 (today is Feb. 17) but I lost my data (or connection to it) over the night. It was there yesterday (Feb. 16). thanks for any help!

Hi All, I have lost all data in my Lightning calendar. "Home" calendar appointments, along with those coming from my Google calendar are all gone. I see that Thunderbird did an update on Feb. 5 (today is Feb. 17) but I lost my data (or connection to it) over the night. It was there yesterday (Feb. 16). thanks for any help!

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I also just noticed that at the top of a meeting invite it says "No writable calendars are configured for invitations, please check the calendar properties."