I recently un-installed an old version of Thunderbird that was showing a vulnerabilty and would not patch itself to the latest version for some reason (old version was in the 60s). I had all mail stored in a non-standard folder on my D drive so that it would be included with my backups. After uninstalling, my non-standard folder is still there. However, the location where Thunderbird was originally installed was removed and that is not included in my backups.

I installed today the newest version of Thunderbird, but I cannot get it to open my old mail. I'm able to login to my accounts, but I need to access the email stored in my non-standard storage file.