The original system developed by the company that became known as Microsoft was a Basic Interpreter for the Altair microcomputer. This single language operating system was sold as Altair Basic.
They next developed a version of unix licensed from AT&T called Xenix.
Microsoft later purchased a dos like system, renamed it MS-DOS and licensed it to IBM for the IBM PC as PC-DOS. The name "DOS" was generic and existed on many computer systems at the time that had a Disk based Operating System.
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Windows is an operating system produced by the Microsoft company. Windows is not a computer or a company. The first Apple computer was sold in July 1976. The first version of Microsoft's Windows operating system was sold in 1985.
MS stands for Microsoft. MS stands for Microsoft. Microsoft created the Word Procesor in the early 90s as part of an initiative to combat the workd processor "Word Perfect." As the original member of the Microsoft Office Suite, it remains one of the permier word processors, although less expensive alternatives are being produced by competitors.
The term you want is PC: personal computer. This architecture implies operation under the Disk Operating System -- DOS, written by Microsoft. Many other vendors now manufacture PCs that all operate under a Microsoft operating system. In addition, the Linux operating system can operate a PC.
Assuming that we are only talking about the personal computer (PC) market, before Microsoft's Windows operating systems, Microsoft's Disk operating system, or DOS, was used. Before that, CP/M was a popular computer operating system.
Microsoft Windows is a series of software operating systems and graphical user interfaces produced by Microsoft. Microsoft first introduced an operating environment named Windows in November 1985 as an add-on to MS-DOS in response to the growing interest in graphical user interfaces.