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thunderbird keeps running in background when I close program

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When I go to open T/bird I get the msg that it's already running. So I have to goto Taskmanager and end process for T/bird; then I can open the program and receive and send email.

This has only started recently ... any suggestions as to how to fix this?

When I go to open T/bird I get the msg that it's already running. So I have to goto Taskmanager and end process for T/bird; then I can open the program and receive and send email. This has only started recently ... any suggestions as to how to fix this?

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Hello,

Please see this article: