1. A method for migrating a user from (i) a first client computer system coupled through a computer network to a server computer system to (ii) a second client computer system coupled through the computer network to the server computer system, the method comprising: retrieving data files associated with the user from the first client computer system; marking the user as not registered within the first client computer system; storing the retrieved data files within the second client computer system; marking the user as registered within the second client computer system; querying the server computer system regarding the status of the user; and restricting access by the user to the second client computer system pending receipt of data representing the status of the user from the server computer system.