SOA is only possible using Web Services

This article on the webservicespipeline.com site talks about another article by William Zentmayer who spouses that Services Oriented Architectures (SOA) are not possible without using web services. William does know that there are other technologies like CORBA that have been around for years that also can provide SOA-like capabilities. The interesting point made though is that web services provide such a low technology entry point and are so simple that any language, platform or system can implement web services allowing for extremely loosely coupled environments required by SOA that William Zentmayer argues that only Web Services can provide a true SOA capability.

Links
Webservicespipeline article
William Zentmayer's First Article
William Zentmayer's Second Article