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  Did you know that OS/2 wasn't Microsoft's first non Unix multi-tasking operating system?
Time: 20:40 EST/01:40 GMT | News Source: Microsoft | Posted By: Jonathan Tigner

Most people know about Microsoft’s official timeline for its operating-system like products

  1. Xenix - Microsoft’s first operating system, which was a version of UNIX that we did for microprocessors.
  2. MS-DOS/PC-DOS, a 16 bit operating system for the 8086 CPU
  3. Windows (not really an operating system, but it belongs in the timeline).
  4. OS/2, a 16 bit operating system written in joint development with IBM.
  5. 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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