upgrade to Thunderbird 102
My Thunderbird just updated to the new 102 version. On my old version, I had folders for my old email address (6 or more years ago) where I could view some old emails I saved. I can't seem to find those folders now. I can, when composing a new message, click on the arrow by the FROM and pick the old email address. But of course that ISP is long gone.
Mike Dunton
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If you updated from 91 to 102, or moved your profile, while Thunderbird is down, delete folderCache.json in your thunderbird profile
I have the exact same problem as Mike Dunton, but I'm afraid I do not understand Wayne's reply. (I also updated from 91 to 102.) Thanks for any clarification.
By gosh, it worked. Amazing! A search couldn't turn up folderCache.json, but I found it in ~Library>Thunderbird>Profiles>02m66mo2.default. (This last destination might be specific to my system [10.14.6, MacBook Air (13-inch, Early 2015)]; I had saved it elsewhere since it had rescued me in the past.) I now have my 6000+ archived emails back. Thank you, Wayne!!