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#31
You'll notice that was MS plus not MS alone working with AT&T a large communications company. Time frame "early 70s" while Windows 1.0 followed the early forms of MS Dos.
1985: Windows 1.0
The first version of Windows provided a new software environment for developing and running applications that use bitmap displays and mouse pointing devices. Before Windows, PC users relied on the MS-DOS® method of typing commands at the C prompt (C:\). With Windows, users moved a mouse to point and click their way through tasks, such as starting applications.
http://www.microsoft.com/windows/WinHistoryDesktop.mspx
Then there was the later startup of the server type rather then desktop as far as Windows was concerned.
Windows Products and Technologies History
Windows Server Timeline
Published: June 5, 2002 | Updated: June 30, 2003
In 1988, Microsoft formed what would become the development team for the Microsoft Windows NT® product. The team's goal was to develop a 32-bit, multipurpose operating system in anticipation of a PC chip architecture that was still a few years away. Microsoft Windows Server™ 2003 is the evolution of the server operating system that Microsoft began with the release of the first version of Windows NT Server in 1993. Windows Products and Technologies History: Windows Server Timeline