Nathan, can you not attempt the conversion with an offline local copy of the YaBB database?
Not sure I believe reading that the databases needed to be on the same machine and or linked to where you could access the offline machine from the server with SMF.
Okay, I don't know if this was addressed, but I have to ask: Where did the mod powah go?
Yeah this was addressed earlier (few posts up), the post:
While trying to find any possible problems with the new forums that may be causing the post conversion not to work. I did notice that every single user was a FAQ Moderator. So hopefully it's just the independent groups that is causing all the grief. To test this I'm going to remove the two independent groups "FAQ Moderator" and "Forum Moderator" in attempts to fix this issue.
So any user with these privileges are going to temporarily get them removed. While I try to convert the forums again later today. I apologize ahead of time for users with these rights, just shooting in the dark trying to get the forums converted.