I lost all my message filters when I had to redo my Thunderbird connection to Yahoo (because they recently changed their security). I want to avoid this in the future, so I need to make sure I can back up my filter settings. The filters are kept in "msgFilterRules.dat". That file doesn't seem to exist on my PC. I checked my account settings to see what Thunderbird has for "Local Directory". The entry is: "C:\Users\tiern\AppData\Roaming\Thunderbird\Profiles\mn5u78x1.default\ImapMail\imap.mail.yahoo-2.com". The folder "AppData" does not exist under "C:\Users\tiern". Where are my filter definitions? Thunderbird version is 68.12.0.