> The dealbreaker for me when I tried Thunderbird years ago is that it lacked any way to export the filters you'd set up, so you could copy them to your other computers. Has this been addressed?
It’s been a while since I used Thunderbird and looked at its internal files. But I remember some .dat file inside the profile that stored the filters and could be copied across.
Edit: Found it. The filter rules are in a file called msgFilterRules.dat. This answer and others on super user (from more than 10 years ago) have the details. [1] I’m sure the Thunderbird forums would also have this information.