Comment 6 for bug 558093

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The flat file databases are unused when you put the MySQL adaptor in
place, and they are untouched (and indeed not deleted) by it, the MySQL
adaptor only queries the MySQL tables for membership information, without
trying to force you into using it fulltime by deleting anything, etc.

Once you unconfigure the MySQL adaptor, Mailman should revert back to
your existing flat file databases.

Of course, I could have missed something, etc. so do back up your flat file
databases before installing the MySQL adaptor, and then you can just
migrate back to them by restoring the backups.

Either way, you have come up with a good question for an FAQ on the SQL
adaptor :-)

K.