Thunderbird won't start
Thunderbird suddenly won't launch. I get an error message that only one copy of Thunderbird can be open at a time. There is no other copy open (see image.
Thunderbird suddenly won't launch. I get an error message that only one copy of Thunderbird can be open at a time. There is no other copy open (see image.
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If you use Windows, click open the Task Manage and scroll active tasks. Sometimes, Thunderbird closes but does not shut down. You can highlight and click 'end task' to close it.