Hi, I just moved my thunderbird (latest version for Windows XP 32-bit) from my old Windows XP PC to new Windows 10 PRO PC (Thunderbird 91.2.0 64-bit). I moved my profile folder to new PC. All my messages were moved with no problem but had to enter all passwords as if they didn't come with my moved profile. I'm now having problem logging in to POP3 mail servers. Every time I logged in, if I checked the box "Use Password Manager to remember this password" It showed as > Gmail: Nothing happened. No email downloaded from server. > Outlook: the bottom status bar showed "Connect to pop-mail.outloook.com..." and stayed like that forever. No email downloaded from server. However, if I unchecked the "Use Password Manager to remember this password" box, Thunderbird can download all my emails. But I have to enter all passwords every time if I restart Thunderbird. What I have done but problems still persist. > Uninstall Thunderbird and reinstall > Delete key4.db, key3.db, logins.json, cert9.db from my profile folder and restart Thunderbird > Turn off 2-step verification in gmail account and use real password instead of app password How can I correct this? Please help. Thank you.