Support for maildir format has existed since Thunderbird 12.
https://wiki.mozilla.org/Thunderbird:Pluggable_Mail_Stores
You can follow the steps outlined here but to minimize the risk of data loss, please back up your profile first.
https://jaisejames.wordpress.com/2012/03/15/to-activate-mail...
https://support.mozilla.org/en-US/kb/profiles-tb
https://support.mozilla.org/en-US/kb/moving-thunderbird-data...
Thanks!
Support for maildir format has existed since Thunderbird 12.
https://wiki.mozilla.org/Thunderbird:Pluggable_Mail_Stores
You can follow the steps outlined here but to minimize the risk of data loss, please back up your profile first.
https://jaisejames.wordpress.com/2012/03/15/to-activate-mail...
https://support.mozilla.org/en-US/kb/profiles-tb
https://support.mozilla.org/en-US/kb/moving-thunderbird-data...