BA provides system upgrade and performance enhancement services to insulate from application redundancy, remain abreast of version revisions and benefit from improved and advanced features.
Oracle recommends its customers to upgrade to the latest version of the releases to derive optimum results from the products. Generally the newer versions have lot of new features, enhancements and performance improvements.
Oracle phase out support older versions including Oracle Applications 11i and Oracle Database 9i. Absence of Oracle support can have adverse effect since when application counters some failure or is down lack of proper support will translate to business disruptions, slow down etc