Let me preface this by saying I'm not particularly a microsoft basher, however this smacks of their history of interface development. Remember COM in the 90's?

Let me preface this by saying I'm not particularly a microsoft basher, however this smacks of their history of interface development. Remember COM in the 90's? It was so complicated no one really knew how it worked. The only way to use it was to use a compiler that had native support for it ... MS Visual Studio and MS VB. Delphi came a long way quickly and made it work. Anyway whether intended or not, the result was you were initially tied to using a MS tool to use the technology. SOAP seems the same. Odds are if you're writing one end of it or another (client or server) somewhere the mix you're going to have a Microsoft tool. If you want to talk to the product of that Microsoft tool by far the easiest way will be to use a Microsoft tool. So despite being "open", their implementation of it ties you into some vendor-specific tools.