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Thunderbird has crashed and all attempts to kill thunderbird.exe are to no avail. I've tried Task Manager and Process Explorer from Sysinternals and simply nothing happens when I select 'Kill'.

I try taskkill:

>taskkill /IM thunderbird.exe /F
SUCCESS: The process "thunderbird.exe" with PID 6404 has been terminated.

The output suggests it works, yet thunderbird.exe with PID 6404 remains.

A reboot finally shifts it.

There probably isn't much I can do to prevent this happening again, but I'm curious as to, at least in general, what can cause a process to end up such in a state where it cannot be terminated. Does anyone have any ideas on this point?

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In Process Explorer you can select File -> Show Details for All Processes or Run As Administrator which might enable killing of a hung process like this. I've had some success with this method in the past. –  andyb Jan 9 '14 at 10:10
You should try to kill it as administrator ? –  Devid May 9 '14 at 10:43

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