What version number? Which antivirus software?

Thank you for your reply.

I can't find the current version because the app is stuck and won't respond on startup. It's the latest production version as of a few weeks ago. This problem started happening a few weeks ago. I upgraded to the latest version in an attempt to fix the problem but the problem persists. I tried starting in "safe mode" but app gets stuck on the same problem and I can't figure out how to get past this. The problem appears to be when accessing my the GMail account but nothing has changed on that account for over a year. I have no antivirus other the built-in Windows Defender. Thank you for your assistance.

Create an exclusion in Defender for the Thunderbird profile folder, so that Defender's real-time scanner will not scan it. https://support.mozilla.org/en-US/kb/profiles-where-thunderbird-stores-user-data#w_how-to-find-your-profile

Thank you for your reply. Creating an exclusion in Defender for the Thunderbird profile folder did not fix the problem. It still gets stuck in the exact same place as described earlier. Any help you can provide would be appreciated.

• Reinstall from https://www.thunderbird.net/en-US/download/
• Start Windows in safe mode with networking enabled - https://support.microsoft.com/en-us/help/12376/windows-10-start-your-pc-in-safe-mode
• Still In Windows safe mode, start Thunderbird in Troubleshoot Mode - https://support.mozilla.org/en-US/kb/troubleshoot-mode-thunderbird

Does problem change?