Hi Michael,
Your existing Flex apps will continue to work. Retired Phase means that these Softwares have been removed and are no longer available or supported. Apart from that Phone and chat Technical support will not be available. Access to very limited support will be provided through the online support center including knowledge base, supported environment, downloads, and discussion forums. Although the online information will remain available to users, this information will not be updated for retired products. Users, however, will be able to browse existing documents.
Thanks,
Richardson