Systems and methods are provided for automatically configuring an email client during a migration process. An client-side assistant can be deployed to an end-user's computer via a migration platform. After being deployed to a particular client computer, the client-side assistant can be configured to obtain user information to identify the end-user associated with the client computer. After identifying the end-user, destination system information regarding the end-user can be pushed to client computer for inclusion in new configuration information for the email client. Before generating the new configuration information, user credential for logging into the source system can be obtained. The client-side assistant can be configured to cause the destination system to confirm this credential. After generating the new configuration information, the client-side assistant can instruct the client-side assistant to use the new configuration information to at a specific time and date.