On 13th of June 2006, JBoss announced it acquired and would open source the mature ESB that had been the backbone of the second-largest insurance provider in Canada. The ESB (Rosetta), was developed using JBoss Enterprise Middleware Suite (JEMS) technologies and has been proven in enterprise use, handling data from 3,000 employees, 40 locations and two million customers for nearly three years.

The ESB donation to JBoss brings a base transport mechanism; pluggable architecture; support for a variety of messaging services, including JBossMQ (Java Messaging Service-JMS) and IBM MQSeries; a transformation engine to bridge data formats; a service registry; a persisted event repository to support governance of the ESB environment and a notification service to allow the ESB to register events and signal subscribers.