On my joomla 1.5 site I've disabled the unique email check by editing the Joomla code. I need this for I have many young users having the same email address as their parents. When adding new users with an existing email I must first add them as joomla user and then edit them as CB user.

Now I want to import these users in a new joomla 2.5 site using CBJuice. But even if I check "Process CSV files using the username" I get the message xxx@yyy.com is not unique. On the new site I also disabled the unique email check in Joomla. Any idea how I can import users with non unique email?