
Step 3: In the left panel, select the Recovery option. Step 2: Go to the Windows Update section. Step 1: Press Windows key + I to open Settings. You can start Windows in Safe Mode to try to resolve the issue. Step 8: Restart Thunderbird and see if the issue is resolved. Note: You need administrative access to delete the file. Step 7: Search and delete the parent.lock file. Step 6: Open the Thunderbird profile folder. Step 4: Now, press Windows key + R to open the Run utility. Step 3: Under the Processes tab, find and kill all Thunderbird-related processes. Step 2: Right-click on the Taskbar and click on Task Setting. However, you can delete the parent.lock file manually.


If the file is not deleted automatically, it may cause issues such as Thunderbird won’t open. Thunderbird creates parent.lock file every time it starts and automatically deletes the file when it closes. To restart the modem, just press the Power button on your modem, wait for a couple of seconds, and then turn it back on again. Several users have reported fixing the Thunderbird won’t open issue by simply restarting their modem. Methods to Resolve the Thunderbird won’t open in Windows Issueīelow, we’ll be sharing some simple yet effective methods to resolve the Mozilla Thunderbird won’t open issue.
