Thunderbird gemenskapsforum

Hi, I have had TB working for a decade without a (serious) problem, now it suddenly stopped working and slowed down creating a lot of problem to the whole PC. It wasn't useful to reinstall or moving mail from the inbox or rebuild the index, so now I've decided to purge it all and uninstalled it, then I need to know exactly all the remaining folder and file to delete, as well as registry keys involved by any modification. Other info: Win 10 pro 22H2 completely updated, no particular AV, rather firewall on the router plus Defender on the PC (intel 7 9gen + 16GB ram). I have 4 gmail accounts, 1 Italian free mail and 1 registered mail, that works very well from the relevant web sites. Just for the sake of curiosity, what kind of problem it could be? Most important of all: does such problem can repeat starting from scratch? I don't want to face again such kind of mess. Thank you for your time and consideration Best regards Vincenzo