Can I clarify something please.
Will the conversion rename the existing YaBBSE tables or will they simply copy the data from Yabb to SMF?
Also, can the conversion be run twice?
As in, Leave the YaBBSE up and running but behind the scenes convert the full data, go in and set all the necessary member groups, permissions, banned lists etc etc, then redo the conversion to carry across the latest threads and members from Y to SMF