This is the second time I have had to downgrade Thunderbird because of my emails not showing. Any of them no matter what folder. Last time it happened I skipped an upgrade and everything worked properly but I only hope the same applies this time. I have used Thunderbird for must be over 20 years so not a newbie. Fedora 39 (64Bit) with all current updates and Thunderbird 115.3.1 (64-bit) after downgrading from 115.8.1. Years ago I contemplated writing my own email client but decided against it. Two things in programming KISS = keep it simple stupid and if it isn't broken DON'T fix it. Thunderbird for me had been rock solid for so many years that I am now very disappointed. Thanks though to all the good programmers of the past