ASG-Cortex-MS (Migration System) is a set of customizable software tools and a method for migrating an IT center from VSE/ESA operating systems to z/OS or OS/390. It automates most of the tasks involved in migration — with no disruption in day-to-day IT production. Without Cortex-MS, a complete migration may take six to nine months to complete. Cortex-MS uses the en masse switchover technique, making it possible to migrate all of your applications in just a couple of days. Cortex-MS has migrated hundreds of sites worldwide.