Interoperability Solution. Got UNIX? Then you might want to check out this year's winner of the award for Best Interoperabilty Solution—Microsoft Windows Services for UNIX. SFU provides the tools and environment that IT pros and developers need to integrate Windows with UNIX and Linux environments. The latest version offers enhanced performance of cross-platform tools and services, improved UNIX command-line administration, and the ability to extend UNIX-based applications in a Microsoft .NET Web services environment. Best of all, it's free.