One of the strong points of the BizTalk Server Integration suite is the inclusion of a very versatile, flexible and extendable Business rules engine.
This versatility, however, is the same thing that makes it widely underused in deployments using BizTalk Server. Even today, being on the market in various versions for more than 6 years, I see people often struggle with it.
The root problem: the same flexibility and versatility comes with a rather steep learning curve to master.
To help you get started, Microsoft has packed a hands-on learning guide into a Virtual Lab. You can get to it here.
Try it, you won’t be disappointed.