This IBM® Redbook is a guide to using WebSphere® Message Broker V6.0. This book updates the popular redbook SG24-7090, which contained basic material for WebSphere Business Integration Message Broker V5.0. This book covers many of the significant updates and new features that have been introduced in WebSphere Message Broker V6.0. This book starts with instructions for installation, basic configuration, and checking that the product is configured correctly. Guidance is provided for developing basic message flows and message sets. Message transformation is demonstrated using the main range of techniques available in the Message Brokers Toolkit: ESQL, JavaTM, and mapping. Common administration tasks are also described for WebSphere Message Broker, including how to configure broker domains and how to deploy message flow applications to the broker. The sample message flows and message sets that are demonstrated in this book are available for download from the Web. This book includes details about where to look for diagnostic information in the product and help with solving problems. This includes how to use the Flow Debugger. Assistance is provided on where to find more information about the product, including product documentation updates and sample applications. In addition, the application development chapter from the WebSphere Business Integration Message Broker Basics book has been extended to three chapters to include more details about how to perform message application development using ESQL, Java, and mappings.