Most people know about Microsoft’s official timeline for its operating-system like products
- Xenix - Microsoft’s first operating system, which was a version of UNIX that we did for microprocessors.
- MS-DOS/PC-DOS, a 16 bit operating system for the 8086 CPU
- Windows (not really an operating system, but it belongs in the timeline).
- OS/2, a 16 bit operating system written in joint development with IBM.
- Windows NT, a 32 bit operating system for the Intel i386 processor, the Mips R8800 and the DEC Alpha
But most people don’t know about Microsoft’s other multitasking operating system, MS-DOS 4.0 (not to be confused with PC-DOS 4.0).
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