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Unable to open Thunderbird - message "Thunderbird is already running but not responding. The old Thunderbird process must be closed

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mcdsyd
mcdsyd
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Please advise how I can shutdown/close/ininstall Thunderbird to allow a new version to be installed.

Please advise how I can shutdown/close/ininstall Thunderbird to allow a new version to be installed.
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Ed
Ed
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Try closing TB and deleting the parent.lock file in the profile folder.

To open your TB profile:

- TB menu > Help > Troubleshooting Information

- click the Application Basics > Profile Folder 'Open Folder' button

If that doesn't work:

Close TB and open the Profile manager. Select the profile you want to use by default > check 'Use the selected profile...' > click 'Start Thunderbird'. 

Also make sure TB menu > Settings > General > System Integration > 'Always check to see...' is enabled and click the 'Check Now' button.

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