Why not use impex transfer the registration record to the new forum?

VBB provide a tools IMPEX could import Discuz data to VBB forum, I am not sure the post will be transfer or not, but at least the members record could be transfer to the new forum.
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Need any assist just let me know. I am transfer my Discuz 5.5 forum to VBB too. Over 20,000 member, is a hard job. :

English forum, not Chinese - English forum,VBB is very good !:

Sure. I think the post may not been transfer to the new forum, but the members information could transfer to the new forum.

HI Long Leg Uncle