The best way to do this is to do a 'test' import first.
As has been suggested, use Impex to handle your needs, but test EVERYTHING first. Put things up on a test forum, setup VB on it's own database, and then do an import (using impex).
Once that's done, try logging in as a few users, or having a few of your own users log themselves into the test forum.
This should give you a pretty good feel for what is what and whether or not your 'import' will be successful.
I haven't personally had any problems with phpbb2 to vb, but I haven't got a ton of experience with it either.
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