Important Notice: We're experiencing email notification issues. If you've posted a question in the community forums recently, please check your profile manually for responses while we're working to fix this.

On Monday the 3rd of March, around 5pm UTC (9am PT) users may experience a brief period of downtime while one of our underlying services is under maintenance.

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

I get a "Close Thunderbird" message when I open the app

  • 3 replies
  • 4 have this problem
  • 2 views
  • Last reply by sfhowes

more options

When I open Thunderbird I get the error message "Thunderbird is already running, but is not responding. The old Thunderbird process must be closed to open a new window." I cant see an older Thunderbird process to close, and Thunderbird is actually working fine. If I click the close button Thunderbird closes and re-opens

When I open Thunderbird I get the error message "Thunderbird is already running, but is not responding. The old Thunderbird process must be closed to open a new window." I cant see an older Thunderbird process to close, and Thunderbird is actually working fine. If I click the close button Thunderbird closes and re-opens

All Replies (3)

more options

I have a similar problem, but TB does not work at all. My Thunderbird app has gotten corrupted. I get the message"Thunderbird is already running, but is not responding. The old Thunderbird process must be closed to open a new window." clicking on the close button does nothing, in a moment I get the same message back. I tried deleting Thunderbird and re-installing - no change, i still get the message. Even after shutting done several times and even pulling the power after shutting down. How can I get my Thunderbird back?

more options

Did you delete the lock file as explained in the kb article?

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