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Lost all emails and folders. Why is it asking me to set up an account when I already have one?

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I rebooted my computer and when I opened Thunderbird, it asked me to set up an account. I've been using this program for several years and I just lost all my important emails and folders. Where are all my emails and folders I had pain-stakingly set up?

I rebooted my computer and when I opened Thunderbird, it asked me to set up an account. I've been using this program for several years and I just lost all my important emails and folders. Where are all my emails and folders I had pain-stakingly set up?

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