I went back to Thunderbird this week because NEW Outlook won't show a unified inbox, and this afternoon, Thunderbird's unified inbox is broken in addition.

Notice you got no reply. That is because the issues with passwords and connection failures post update are rarely anything to do with Thunderbird and everything to do with antivirus programs and their attendant software firewall that mess up post update. Everyone is basically tired of repeating themselves on the post update issues year in and year out. Try this. # Does Thunderbird work as expected in [[Troubleshoot Mode Thunderbird|Thunderbird troubleshooting mode]]? # Does Thunderbird work as expected with your OS started in '''[http://en.wikipedia.org/wiki/Safe_mode safe mode with Networking]'''. Instructions for each operating system: [https://support.microsoft.com/en-us/windows/start-your-pc-in-safe-mode-in-windows-92c27cff-db89-8644-1ce4-b3e5e56fe234 Windows 10/11], [https://support.microsoft.com/en-us/windows/windows-startup-settings-including-safe-mode-7f31dcea-6427-0ba0-ec1b-729a56321cd3 Windows 8], [https://support.microsoft.com/en-us/windows/advanced-startup-options-including-safe-mode-b90e7808-80b5-a291-d4b8-1a1af602b617#start-computer-safe-mode=windows-7 Windows 7], [http://support.apple.com/kb/ht1564 OSX]