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Thunderbird is already running, but is not responding. The old Thunderbird process must be closed to open a new window.

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I get this message every time I try to open Thunderbird. Thunderbird is already running, but is not responding. The old Thunderbird process must be closed to open a new window. What can I do?

I get this message every time I try to open Thunderbird. Thunderbird is already running, but is not responding. The old Thunderbird process must be closed to open a new window. What can I do?

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