I downloaded Thunderbird Portable onto my portable hard drive, which contains the Google Takeout .mbox file I am trying to access. I succesfully installed the Import/ExportTools NG add-on, and followed online tutorials stating that I should select the option for .mbox imports. When I restarted TP, I did indeed see the .mbox file I was looking for, with a number next to it in parantheses that was slowly increasing. I assume this is the number of total emails, and waited until TP had loaded everything completely. However, this is where the online tutorials no longer worked: clicking on this folder does nothing. It appears to be empty. What have I done wrong? Some tutorials mentioned that I needed to remove the .mbox file extension, but that solved nothing (in the photos you can see that both files with and without the extension appear to be empty). I tried looking into ThunderbirdPortable/Data/profile/Mail/Local Folders, and I am able to see the .mbox file that I imported. Then there is a duplicate .msf file, which I am guessing TP creates in the import process. Before opening TP, I see that there is some file size to the .msf file. But after opening TP, the file size reduces to 0 kb. Is this normal, or perhaps a part of the problem?