This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

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.

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

  • 1 reply
  • 1 has this problem
  • 12 views
  • Last reply by Zenos

more options

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)

more options

Have you looked for and removed a lock file?

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