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Thunderbird suddenly marked all my messages as read

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Hello, Thunderbird suddenly marked all my messages as read (not after re-opening or so). How can I undo this? I would like to get back to the earlier situation where I can see again all my messages that were unread. Thanks in advance for your help.

Hello, Thunderbird suddenly marked all my messages as read (not after re-opening or so). How can I undo this? I would like to get back to the earlier situation where I can see again all my messages that were unread. Thanks in advance for your help.