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View Thread: In which language microsoft is developing longhorn?
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    Well, Longhorn is a continuation of the existing Windows XP/2003 codebase.

    The kernel-mode bits of Windows are mostly written in C.  There is a little bit of x86 assembly language for some platform-specific things.

    The user-mode things are mostly C with a bit of C++ here and there.

    Longhorn is adding some managed code to the system.  Presumably, this will be written in C#.

    Regarding MS-DOS:  From my understanding, it was written almost exclusively in x86 assembly language.