In its 3.0 release, Apache Geronimo 3.0 has been rebased on an OSGi runtime. Geronimo’s traditional modularity is now expressed as OSGi bundles. Server assembly and application-centered deployment are now done by installing sets of bundles into an OSGi core framework. JavaEE applications are deployed by transforming them into collections of bundles. In this talk, we will review this extensive restructuring of the Geronimo runtime and discuss the new capabilities that this new framework provides.