#4 Palm OS

Year created: 1996

Company: Palm Inc.

Palm OS is a mobile operating system initially developed by Palm, for personal digital assistants (PDAs) in 1996. Palm OS is designed for ease of use with a touch screen-based graphical user interface. It is provided with a suite of basic applications for personal information management. Later versions of the OS have been extended to support Smartphones.

The OS couldn't keep up when it came to the Web and multimedia, and competition from iOS and BlackBerry made the OS redundant.

#3 MS-DOS

Year created: 1981

Company: Microsoft

MS-DOS, short for Microsoft Disk Operating System is an operating system for x86-based personal computers. It was the most commonly used member of the DOS family of operating systems, and was the main operating system for IBM PC compatible personal computers during the 1980s to the mid-1990s, until it was gradually superseded by operating systems offering a graphical user interface (GUI), in particular by various generations of the Microsoft Windows operating system. It eventually went through eight versions before development stopped in 2000.

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