User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:93.0) Gecko/20100101 Firefox/93.0

Steps to reproduce:

Auto upgrade to 91.2.0.

Actual results:

After upgrade to 91.2.0 my entire calendar (lightning) has been erased?! I'm running win 10. If this can;'t be repaired, I'm done with thunderbird.

Expected results:

My calendar should have been converted to the new system.

Where is your calendar stored?

If it is a "network" calendar, is it using FTP by any chance (do a "properties" on the calendar).

(In reply to Lee Bosch from comment #1)

Where is your calendar stored?

If it is a "network" calendar, is it using FTP by any chance (do a "properties" on the calendar).

My calendar was stored locally, not linked to any other program. I tried copying the files from a backup I did yesterdy to calendar-data, but that didn't work. I also tried copying storage*.*, also no luck.

This is absolutely a horrible thing to do.

Do the calendars appear in the Calendar List?

If you select one in the list, does it have a line through the eye icon that appears?

Click the eye icon to remove the line and let us know if that worked.

local-sqlite seems to contain my calendar information, but it doesn't display. I saw my data by showing the file in a hex editor.

The only calendar is Home. I tried every entry in the context menu and nothing made any difference.

(In reply to spikeevans from comment #5)

The only calendar is Home. I tried every entry in the context menu and nothing made any difference.

When you selected the calendar and right-clicked, the context menu list had Show Calendar or Hide Calendar?

If I enter a new event from the inbox tab, it shows in the event tab, but not in the calendar tab. I I enter a new event from the calendar tab, it shows both on the inbox tab and the calendar tab. If I exit thunderbird and restart, the calendar is empty.

The context menu shows hide calendar. See my previous message; it seems that restarting thunderbird erases the calendar.

Here is abort-session-ping from the dataporting folder

Also from datareporting folder

Last from datareporting folder

Found that if I delete storage.sdb then at least new events aren't deleted on startup. But I still don't have my old calendar.

I'm not sure it's significant but thunderbird was installed in "program files (x86)" even though about says it's now a 64 bit app.

Probably a duplicate of bug 1727062.

A possible fix may be deployed soon... and possible workaround may exists... see Bug 1727062 Comment 67 for more details...

Or try instructions at this link:
https://support.mozilla.org/en-US/questions/1352939