I installed Ubuntu 16.04 LTS on top of 12.04 LTS, which had an up-to-date Thunderbird running on it. However, when I launch Thunderbird (45.3.0), it presents me with the "Welcome to Thunderbird" dialog and doesn't see any of my accounts (or folders). I've confirmed that profiles.ini is pointing to the right folder. I've tried creating a new profile and copying the old profile's files and folders over to it. Same result. No other symptoms. No error on stdout/stderr, no other messages. Just an apparently empty profile (which isn't empty at all on disk). Do I need to resort to ImportExportTools? Thanks much for the replies.