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thunderbird already active

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After a wondows 10 update, thunderbird gives a message: "Thunderbird is already running" and won't start.

Reboot didn't help.

I have uninstalled and reinstalled Thunderbird ( downloaded the latest version) No succes

help ...

After a wondows 10 update, thunderbird gives a message: "Thunderbird is already running" and won't start. Reboot didn't help. I have uninstalled and reinstalled Thunderbird ( downloaded the latest version) No succes help ...
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