Imported mail messages are empty
I'm trying to import local mail folders from PostBox v3.0.8 into Thunderbird. I first tried the included Import Tool and selected "Import from another Thunderbird instal… (read more)
I'm trying to import local mail folders from PostBox v3.0.8 into Thunderbird.
I first tried the included Import Tool and selected "Import from another Thunderbird installation" since PostBox is a fork of Thunderbird and supposedly very compatible. This seemed to go fine and all folders with the exact same numbers of messages were imported and the headers looked fine. However, when I open any message, it is completely empty (not even the from, to, subject fields are shown, just a white window).
I then just manually copied the Postbox mail folders directly into the Thunderbird folder. This also seemed to go fine (as above) but also, all messages were empty.
How can I import the messages correctly?