The ESB Guidance solution package rose from a desire to create an even more loosely-coupled, generic messaging model and toolset in BizTalk than already existed. ESB Guidance is not a product per se, as it has no official Microsoft support and should not be considered to be "ESB in a box" but rather, is an offering consisting of a set of services, components, and patterns which extend existing BizTalk capabilities.
Similar to BizTalk Server itself, you do not need to use the entirety of the solution, but instead you may pick and choose the components and services that solve a specific problem. You can apply the Transformation Service if you want to reuse BizTalk maps from external clients, or engage the Exception Management framework if you want a uniform way to publish, capture, and report on application exceptions.
The Itinerary processing services and components offer a compelling way to reduce the number of managed endpoints while enabling an easy way to model the...