re :The folder is in program files (x86) no where else. That is where the Thunderbird program should be installed, it is not where the profile is located.

Thunderbird profiles are located here: C:\Users\<Windows user name>\AppData\Roaming\Thunderbird\Profiles\<Profile name>\ So this is the 'Thundrebird' folder which has all info on profiles etc.

re :Tried to put in my old profile folder Access old hardrive.

• Access the 'Roaming' folder.
• Copy the backup 'Thunderbird' folder

On new computer.

• Exit Thunderbitrd if it is running.
• Access the 'Roaming' folder.
• Delete the 'Thunderbird' folder.
• Paste in the backup 'Thunderbird' folder into the 'Roaming' folder to replace the one you deleted.
• Start Thunderbird.

I have three Roaming folders. One's path is app data/local/roaming both within the app data folder. The local folder has various programs including Mozilla Firefox, but no Thunderbird folder in local. The roaming folder contains a folder named Mozilla within is Firefox which contains a profile folder. I assume that is the profile folder for Firefox only.

The second path is app data/roaming/microsoft/windows/start menu..nothing there.

The third path is app data/roaming/microsoft/crypto/rsa...nothing there.

Would I put the backup Thunderbird folder in the first path: app data/local/roaming? The problem is that Thunderbird never created a folder for itself in this case, it can't find what it didn't create.

I put the backup Thunderbird in the app data/roaming folder, but the shortcut doesn't open it. The program still doesn't see it...

re : app data/local/roaming This does not sound correct. When you were deleteing all sorts of things etc, it sounds like you have messed up something. Thunderbird creates profiles in the 'Appdata> Roaming ' folder, so if it does not exist then that would explain why it cannot locate profile. I'm wondering if you have somehow moved the 'Roaming' folder into the 'Appdata' > 'Local' folder.

Suggest you try moving the 'Roaming' folder from the 'Appdata' > 'Local' folder back into 'Appdata' folder.

There should be:

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

'Roaming' is in 'Appdata', not in 'Local'. https://answers.microsoft.com/en-us/windows/forum/windows_7-performance/where-can-i-find-application-data-folders-in/26f4d163-7340-4974-b513-72bfcd1f54a5

App data has two folders within it, local and roaming, I put the backup files into both but nothing happens. I didn't change the locations of any of the folders in windows. When I first installed Thunderbird, I put some files from my backup into the profiles folder, but that stopped Thunderbird from working. So I started over deleted everything and reinstalled and then the program wouldn't create a new profile folder.