 <p><strong>No</strong>, you don't need to migrate these projects to Apache Flex.</p> <p>Flex 4.6 projects can still be built and deployed; they just don't have the latest SDK changes. Your projects will remain compatible with future Flash Player versions.</p> <p>The only reason to update to Apache Flex at this point is if you need features introduced in a later version of the Flex SDK.</p>