Windows 10 reached EOS (end of support) on October 14, 2025. If you are on Windows 10, see this article.

Avatar for Username

ابحث في الدعم

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More
This thread was closed and archived. Please ask a new question if you need help.
Locked المُؤرشفة

Thunderbird is already running, but is not responding. The old Thunderbird process must be closed to open a new window.

Thunderbird Troubleshooting
Zenos replied
mouj
mouj

Since I was getting abovementioned error, I have uninstalled previous version of thunderbird and installed version 38. Still i am not able to start thunderbird. First error is Thunderbird is already running, but is not responding. The old Thunderbird process must be closed to open a new window. After closing receiving following error Thunderbird is already running, but is not responding. The old Thunderbird process must be closed to open a new window.

Since I was getting abovementioned error, I have uninstalled previous version of thunderbird and installed version 38. Still i am not able to start thunderbird. First error is Thunderbird is already running, but is not responding. The old Thunderbird process must be closed to open a new window. After closing receiving following error Thunderbird is already running, but is not responding. The old Thunderbird process must be closed to open a new window.

All Replies (1)

Zenos
Zenos

Have you looked for and removed a lock file?

http://kb.mozillazine.org/Profile_in_use#Remove_the_profile_lock_file