Point vB's registration links to X-Cart's and you've got a more integrated version. Updating profiles however would still be seperate.
I've considered making it full compatible, but im not vB or phpBB expert and don't know the best possible approachs for such, which is why I only make the conversion one way with my scripts.
As far as upgrading, it causes no problems when upgrading either vB or X-Cart.
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