Just got bitten by the latest Thunderbird update (v17.0.8). Seems the update changed the e-mail server from POP to IMAP. Had to compare my laptop with the desktop to see what changed. The cure was...
Once you setup IMAP, it should re-sync your previous emails. If not, you could transfer your locally stored emails by clicking one, then using CTL+A keys to select all, and drag them over to your new email folder.
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