The Web Services Interoperability Organization (WS-I) has successfully concluded its charter to document best practices for Web services interoperability across multiple platforms, operating systems and programming languages.
The final three Web services profiles developed by WS-I have been approved by WS-I's membership: Basic Profile (BP) 1.2 and 2.0, and Reliable Secure Profile (RSP) 1.0. Stewardship over WS-I's assets, operations and mission will transition to OASIS (Organization for the Advancement of Structured Information Standards).
For ISVs, this means that there're a set of standards that work and have test code behind them that allows you and your customers apps to interoperate across platforms.
A set whitepapers go into much more depth about how to get interoperability between Microsoft platform and products and those from other vendors and open source projects:
- Data Type Interoperability Between .NET and Java
- Oracle WebLogic-to-WCF Secure Messaging Interoperability
- IBM WebSphere-to-WCF Secure Messaging Interoperability
- Standards-Based Interoperability between SAP NetWeaver and Microsoft .NET Framework
- Metro to WCF Interoperability