The litigation was settled in 2001 (according to that page) but occurred before then. MS shipped their Java implementation since at least 1997, which included P

The litigation was settled in 2001 (according to that page) but occurred before then. MS shipped their Java implementation since at least 1997, which included P/Invoke and COM interop – things that encouraged integration with native (platform-specific) win32 libraries and look pretty much the same in C#.