thanks for your response.
Ok as I did not plan to migrate users this will be much more easy for me. I will try to write my own java programm.
If it works I will post my code .... [originally posted on jforum.net by rsoika]
AFAIK, nobody has done this. There is an old PhPBB to Jforum utility but PhPBB's DB format has changed since it was built.
The basic idea is to figure out how the MVN Database information maps into the jForum Database. The jForum DB stuff is fairly clear cut in terms of where posts and topics live. The user info should be easy too. You might have to dig a bit to deal with attachments, avatars, and signatures. User passwords might also be an issue since the two programs probably encrypt them differently.
I'd suggest looking at transfering users first and then working on posts and topics. You'll need the id numbers of the users to get the posts correct. [originally posted on jforum.net by monroe]