Thunderbird 14x series
I was having massive issues with TB when it auto updated from 142 to 143. Then last week, just when I thought I had everything restored, the damn program auto updated to 144.
I still can not "delete" messages or send anything.
I downgraded to 140.3.1 at least with that version I could delete messages. But I still could not send anything. TB send would time out and a window would pop up asking me to "sign in with my ISP".
And like others that have posted, I too lost folders on the new updates.
This whole series, 14x is a bust IMO.