getting indexu accounts into vB involves a "SELECT * FROM idx_users" and an "INSERT INTO user ( and userfield ). One of the problems is the difference in the fields between the two...only a handful are the same...
you could just add/update the basic fields - username, email, usergroupid and password ( vB uses a md5 encrypted password ).
changing the appropriate functions in users.class.php shouldn't be too difficult, just takes time...
esm
"The older I get, the more I admire competence, just simple competence, in any field from adultery to zoology."
.