A windows update broke my Windows 10 installation & I've had to re-install it from scratch. I have succesfully re-installed Thunderbird & got my gmail email, but I am unable to find my local email folders which contain a lot of historic emails that I need access to. All my local data has been preserved in a Windows.old.000 folder, so I should still have this, but I am unable to find it or the old profile. My newly installed Thunderbird has created a new default profile under my windows user profile in a hidden folder called AppData\ , so I've looked in the same place on my old profile under Windows.old.000 & there is a folder AppData\LocalLow\Mozilla but it is empty. I have had Thurderbird for a number of years & so this will have been set up via an older version. I also I normally move data like this to my Documents folder so it is backed up. But, I can't find anything with an obvious name there either. I've also looked at the Thunderbird Troubleshooting info tab & About Profiles tab and nothing obvious seems to help. Can anybody tell me a bit more about the filename, extension or other details of the file I'm looking for or how Thunderbird can find it for me please.