Not ESB This articles lead statement is that BizTalk Server is an Enterprise Service Bus ESB  In fact BizTalk Server has always been positioned as an Enterprise Application Integration EAI server  ESB is a layer on top of a ServiceOriented Architecture SOA and Microsoft provides these capabilities in BizTalk Server as a collection of components and documents in the ESB Toolkit  The ESB Toolkit is not part of the default installation of BizTalk Server and I therefore believe the opening statement of the article is misleadingSir Crispalot