JBoss 5 with completely re-architected components represents the most comprehensive redesign of the JBoss Application Server to date. This session discusses the rationale and goals behind JBossAS 5 and introduces attendees to the new Microcontainer-based architecture that enables the blending of the various component models (simple POJOs, legacy MBeans, OSGi modules, etc.). We will highlight the differences with previous version and go through some of the new features and revamped services in JBossAS 5 including messaging, clustering, transactions and more, as well as provide insights on current and future developments on the road to Java EE 6.