[otrs] Company tickets

In a previous message, someone said that when you change the customerID on a user, it will update all the old tickets from that user automatically... I tried this, and it didn't work. This is what I did: 1: Create new Customer called XYZ (customerID = xyz) 2: Create new user called John Doe, with a customer ID of XYZ and email of John@Doe.com Doesn't this mean that ALL older tickets from John@Doe.com should automatically come under this Customer Company and user?? If not, how can I go back and update all the tickets so that they're under the right customer. There's over 200 tickets that I want to correctly assign to this customer. Thanks.