I am transferring a huge mass of emails from many accounts to a new machine. To start with, I have chosen to export the Local Folders. For that purpose I have installed t… (read more)
I am transferring a huge mass of emails from many accounts to a new machine. To start with, I have chosen to export the Local Folders. For that purpose I have installed the extension ImportExportTools NG and used all combinations I could think of like "Export Folder" or "Export Folder with subfolders". When trying to import them on the new system, I always get empty folders, or the message 'This "MBOX" file uses a different format from the Thunderbird folder format and it's possible that Thunderbird can't handle it properly'.
And sure enough, the resulting folder is corrupted with messages that can't be read.
First of all, I don't know if the files are really MBOX files, because they have no extension, and if not, how do I generate proper MBOX files? Secondly, if these are MBOX files, why can't ImportExportTools NG not handle the files it has just generated?
Alternatively, I could also copy the folders directly, but would that not mess up the internal database?