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All calendar data lost on update to 91.2

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I accepted the update to Thunderbird 91.2.0. When it re-opened all my calendar entries had disappeared. I think they may all have been classified as "work"; anyway, there was just the "Home" calendar and it was empty. How can I retrieve my calendar entries?

I accepted the update to Thunderbird 91.2.0. When it re-opened all my calendar entries had disappeared. I think they may all have been classified as "work"; anyway, there was just the "Home" calendar and it was empty. How can I retrieve my calendar entries?

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