I have a new SMF 2.0.17 forum which all of the attachments didn't get converted. Out of 8000+ only a little over 400 were converted. I have done a test install/conversion/upgrade into a different directory and I believe the majority of the attachments were converted - actually more than the YaBB attachments directory contained! I have been going through and deleting duplicate attachments and after I finish this is there a way to "merge" or replace the attachments table in the live forum with the one from my test forum? Other than this it seems pretty sound data wise.
Thanks...
I cant help you ;D But I want to tune into this topic. I am in the same boat....