[@johnhiler Member 16 years, 3 months ago]

There’s been some discussion on this front:

https://bbpress.org/forums/tags/phpbb

These links might be a good place to start:

https://bbpress.org/forums/topic/phpbb3-gt-bbpress-converter-beta-release

https://bbpress.org/forums/topic/i-wana-convert-my-phpbb-305-forum-to-bbpress-095