[@robin-w Moderator 12 years, 4 months ago]

ok, funnily enough there is no ‘importer’ for bbpress 2.x – it is in plan, but not yet written

You can use
on the old site
tools>export and select forums topics and replies
on the new site
tools>import (and select wordpress if needed)

But this is not perfect – if you don’t have the users matching between sites, then this will/can/may (not sure which) fail.

How have you set users up on the new site?