Z 1 z 5 gwězdkow pógódnośony

wót tonyfirshman dnja Sept. 13, 2018 · trajny wótkaz

Export is fine, buit no import, so useless.
As a Windows user said one can simply copy msgFilterRules.dat

For Apple this is:

Library -> Thunderbird -> Profiles -> <folder> -> imapMail <folder>/msgFilterRules.dat