I am using Debian 9 and thunderbird 68.2.2. I had to replace my hard drive, which no longer booted correctly. Because of this I was not able to do an Exmport/Import. I was still able to access my /home, and copied it entirely to the new drive after installing. Thunderbird recognized my account, and I am able to send and receive emails. My address books are intact. I have a top level Inbox and a top level "Local Folders", but none of the subfolders which I had under Inbox or Local Folders are showing in the left panel. My .thunderbird/profiles.ini shows [Profile1] Name=default IsRelative=1 Path=lc4yasbx.default Default=1 [InstallFDC34C9F024745EB] Default=0runi62z.default-default Locked=1 [Profile0] Name=default-default IsRelative=1 Path=0runi62z.default-default [General] StartWithLastProfile=1 Version=2 I copied the contents of my old installation to both lc4yasbx.default and 0runi62z.default-default. Both of these now contain a "Mail/Local Folders" which contains all my previously visible lcal folders. I would assume that one or the other of these profiles would be active, and that my Local Folders would show up. I *Do* see some differences in the folderTree.json in each of the profiles. I have trying renaming the existing folderTree.json in .thunderbird and replacing it with one that appears to have the complete tree, but this made no difference. If i go into one of the default/Mail/Local Folders/Some-folder-name, I can open the files with a text editor and see that my old emails do still exist. What am I missing? Is the thunderbird configuration *fully* documented somewhere? (Other than in the source.)