I am currently using newbb forum under xoops, however it has less features compare to other forums we were using before. Thinking about transferring to phpBB for example I just wanted to know if anybody had problems in bringing newbb db (with all the topics) under phpbb.
In other words - if I decide to change the forum module I don't want users to suffer from it . They will get different layout but they should still find all their messages as they were.

Thanks for your comments if any - it'll help me to understand if it is worth it.