No more than 6 nested Folders?

[df]

Hi, I wanted to switch my email client, so when I imported my Outlook Express mails, I got an error telling me that a folder has not been created, so the emails couldn't get copied into it. I then tried to manually create a folder, and Thunderbird crashed.
I had to limit the amount of nested folders to 6 and shorten the name of the last folder to have a successful import.
Has this bug been fixed in release 0.4?