[sf-lug] Migrated wrong set from thunderbird, lost a bunch of folders. Can I be saved?

[Rick Moen]

Quoting Michael Shiloh (michaelshiloh1010 at gmail.com):

> Oh, how I miss the old days of mbox format and mutt.

Last I checked, Thunderbird continues to store all mail, sent and
received, in mbox format.  There are binary indexes, which of course you
can delete and thereby cause Thunderbird to re-index the mail from
scratch.

Since you don't have backups, you cannot be absolutely sure that the new
software hasn't someone cut out and thrown away some portion of your
mbox contents, but that strikes me as a-priori unlikely.