I have decided to migrate the meanwhile aged Fireboard forum to a Phpbb3 forum. It offers more and better features and is surely a step forward.
The migration went fine, except for the user passwords, avatars and attachments. (Believe me, it was struggle enough to get the posts over

User passwords
Your username still exists but your password will probably not work when you try to login. If you can't login to the new forum then please click on the 'Forgot my password' link. This will create a new password for you and will sent it to your e-Mail address.
Avatars
Please re-upload your avatar if you want it to be displayed.
Attachments
If you can't access any of the attachments referenced in the posts, post it in the topic and I recover the file.
If you experience any problems, let me know via the contact page.
I am confident that you will appreciate the better forum features and security.
Best regards,
George