Web Services support in BizTalk is not a new topic, it's already mentioned heavily in few of the famous blogs like Darren Jefford , Aaron Skonnard, Biztalk Server Team Blog etc
In this entry I'll explain how you can use the out of the box SOAP adapter to call a web service in a messaging only scenario (aka Content based routing), BizTalk 2004 SOAP adapter didn't have this functionality, we need to use orchestrations along with SOAP adapters to call a Web Servic...
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