You can, and it's not hard :]
You will do:
phpBB3 to SMF [Doc Link]
SMF to phpBB2 [Doc Link]
phpBB2 to IP [Read here]
Please remember that you will lose:
- Permissions
- Redirection Boards
- Avatars
- Profile Fields
- Basic Settings (Convert some of the basic forum settings. (site name, max post length, etc)
- Smileys
Quote: