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Millions of Windows XP disks secretly included Microsoft's failed search assistant to keep pirates at bay — "Bob was actually more useful dead than alive"

Before Windows introduced its modern GUI system, Microsoft was well-known for its iconic command-line operating system, MS-DOS (Microsoft Disk Operating System) throughout the 1980s and early 1990s.
Network World

Timeline: 40 years of OS milestones

Lordy, lordy, look who’s 40! Happy birthday, Unix — you’re looking great for your age. You certainly weren’t the first operating system on any platform, but you managed to stride from the minicomputer ...
Houston Chronicle

How to Configure Config SYS

While Windows has moved away from using Microsoft Disk Operating System as a base, versions of DOS still persist. Some programs refuse to run in modern versions of Windows and require a DOS emulator.
Reuters

Microsoft's journey: four decades, three CEOs

SAN FRANCISCO (Reuters) - Satya Nadella's elevation to CEO and co-founder Bill Gates' decision to relinquish his chairmanship at Microsoft Corp marks a changing of the guard at a 39-year-old company ...