message filter backup in Thunderbird

since the addon has died, the file with the file needs to be restored when the Thunderbird program is stopped.  Kill all instances, then use the following to deal with it

http://kb.mozillazine.org/Filters_%28Thunderbird%29#Export.2FImport

Export/Import

The message filters for each account are stored in a "msgFilterRules.dat" file in the accounts "local directory". The local directory is specified near the bottom of each accounts server settings by the browse button. You could copy that file over the corresponding file in another account. You could also copy and paste filters from one file to another using a text editor. Its a ASCII text file whose format is not hard to figure out.
There is a Message Filter Import/Export but several comments on that add-ons web page claim it doesn't work anymore.

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