U'd have to write ur own script to do it, because it has to basically query the information from EVERY user in ur database (on my site its over 200,000 and would take a while).
Then it has to unserialize the data, then it has to send a query to update the vbbank field for the current user, and then go onto the next user.
So, if u have 200,000 users, it would require 200,001 queries... 1 per user and 1 to grab the entire list of users from the database, so it would make more sense to run this script like vbulletin does and process 1000 users at a time, then u only have 1001 queries executed per time running, but as u can see its still a very costly script.
-CMX
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