Rated 1 out of 5 stars
Well I see you are busy upgrading your addon to the next version of Thunderbird.
On version 52 I still have the same problem. In my inbox I have got 592 messages, and unfortunately the extension has "successfully" copied 589 messages. So, the extension has created the folders tree, that is ok, but I have to delete the 589 messages, compact the target folder, and then eventually copy my 592 messages manually and verify them. Lost of time, lost of communication taxes, and I made a mistake and deleted a wrong folder, in the previous backup.
Do you think you can make your addon work ?
It is really a pain that those 589 messages were "successfully" copied. They take the place where I have to copy the 592.
And you never told me what the three remaining are, so the only solution is to delete what the extension has copied.