Review for Thunderbird Message Filter Import/Export by aelfwyne
Rated 2 out of 5 stars
It doesn't work very well. Export and import are in two different places, and it isn't very clear on what it is actually doing. It actually erased some of my filters, when all I was trying to do was get some filters from account A to account B, it erased the ones I already had on Account B.
Just tried the new version. It STILL deletes filters that exist upon import. This is very stupid, it should merge imported filters, not destroy all your existing filters in the process.
Thankfully I backed up this time before trying this extension.
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