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all my local folders and messages disappeared when I installed Win 10

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I was running Win 8.1 with Firefox as a browser and Thunderbird as a email handler when I updated to Win 10. After making Firefox and Thunderbird my defaults and an automatic sync, all I have left of my local folders is the the trash and outbox.

I was running Win 8.1 with Firefox as a browser and Thunderbird as a email handler when I updated to Win 10. After making Firefox and Thunderbird my defaults and an automatic sync, all I have left of my local folders is the the trash and outbox.

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Did you choose one of the options for Windows 10 preserving your data (e.g., reset, refresh, or possibly similar terms)? You can check for a folder named

C:\Windows.old\Users\your-username\AppData\Roaming\Thunderbird

If you do not immediately see AppData, make sure Windows shows hidden files and folders. To change that setting, see this article (hopefully it's similar in Windows 10): http://windows.microsoft.com/en-us/windows/show-hidden-files

Do you have such a folder?