I came across this link It states that Stardust has very good interoperability with .Net. I assume when anything is exposed as web services , there is no issues with interoperability. Does Stardust provide integration with native .net libraries? If so is Jboss JBPM provide the same level of support?
Stardust exposes all engine functionality via SOAP (and is adding more and more REST). No native library is provided. It is not required.
I cannot comment on jBPM.