I did this a year or two ago. If I remember there exists a yabb gold->phpbb import tool, which was the first step, and there was a phpbb->vB2.x tool, which was step 4. In between were a group of queries that needed to be run to adjust the italics and bolded text back to readable bbcode (step 3) and another query to rewrite the path to the photo attachments that I stuffed all into a single directory. It was like a bad dream, but it worked.
The only thing I wasn't able to accomplish was to preserve the passwords, because of the way the encoding was done. I did get the users in, they just needed to request new passwords. So I sent them all a mass email when it was ready.
There was a user called beheader that paved the way, I just followed in his footsteps with the queries and image handling stuff.
Good luck - you'll be very happy once you're running under php & mysql!
Regards,
Matt
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