The update log says my Thunderbird updated to the newest update on 11/19, I updated my computer to Windows 10 on 11/23. The last time I received a new email on Thunderbird was 11/26. I've followed all troubleshooting suggested on https://support.mozilla.org/en-US/kb/cannot-receive-messages#w_the-problem-suddenly-started-after-updating-to-thunderbird-version-78-try-this. I even restarted my computer after each troubleshooting option and nothing has helped. I am able to log into my mail directly on the servers site. I have a family member that also uses Thunderbird on Win 10 and uses the same email server, she is not having this problem.