Did you backup your data before reinstalling Windows 10?

You posted in the Firefox support fora queue. Firefox doesn't do email, it's strictly a web browser.

If you are using Firefox to access your mail, you are using "web-mail" such as Yahoo!Mail or Gmail. You need to seek support from your service provider or a forum for that service.

If your problem is with Thunderbird, let us know and we can move this thread to the Thunderbird support queue.

https://support.mozilla.org/en-US/kb/problems-with-email-how-to-find-help

Please move my query to the correct (Thunderbird) support queue.

I use Thunderbird email client, not a browser, but I'm having a bad day!

Thanks,

Adam.

Did you backup your Thunderbird profile before reinstalling Windows 10? Typically it would have been in this location: C:\Users\<Windows user name>\AppData\Roaming\Thunderbird\Profiles\<Profile name>\ Backing up / copying the 'Thunderbird' folder would have saved everything.

If no: Do you see a 'windows.old' folder on the desktop? If yes, does it have that 'Thunderbird' folder in it?

You may need to make hidden files and folders visible: http://kb.mozillazine.org/Show_hidden_files_and_folders

If yes. Copy that 'backup 'Thunderbird ' folder.

Exit Thunderbird if it is running. Locate the 'Roaming' folder on computer:

• C:\Users\<Windows user name>\AppData\Roaming

delete the Thunderbird folder that is in the 'Roaming' folder. Then, in the 'Roaming' folder, right click and paste the copied backup of 'Thunderbird' folder.

Start Thunderbird.

Sorry, just realized this duplicates part of the above.

Hi Adam, some styles of Windows 10 reinstall/refresh move your old data here:

C:\Windows.old\

Before proceeding, please set Windows to show you hidden files and folders: https://support.microsoft.com/en-us/help/14201/windows-show-hidden-files

Then check here:

C:\Windows.old\Users\your-use-name\AppData\Roaming\Thunderbird\Profiles

Can you find that folder?

If you have a profile folder there, and it has recently updated contents, then you should be on track toward finding your old mail folders.

Thanks, Toad-Hall. Copying C:\Windows.old\Users\(Me)\AppData\Roaming\Thunderbird to C:\Users\(Me)\AppData\Roaming\Thunderbird has restored my local folders and address book.