Opera mail does not seem to inport any messages.
I get to the import screen and select 'thunderbird' > prefs.js file. Displays the mailfolders. Then I select a .msf file and import to local folder.
Click 'next' and nothing happens:
nothing gets imported.
I also tried the files without the .msf extension, and the folders. nothing.
I read the help pages but nothing precifically about thunderbird.
Maybe I am overlooking something?