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* 1992 - IBM and Microsoft ended their collaboration on OS/2, an advanced operating system with a graphical user interface. IBM continued independent development of OS/2.
* 1993 - Microsoft introduced Windows/NT, incorporating some concepts from OS/2. Unlike previous versions of Windows which required DOS, Windows/NT provided a complete (and more advanced) operating system with a GUI and did not require DOS. All future versions of Windows were based on Windows/NT.
* 2001 - Apple releases MacOS, a Unix-like operating system based on the "Darwin" kernel
* 2007 - A consortium of developers called the Open Handset Alliance, led by Google, releases the Android operating system for mobile devices. The Android platform is based on the Linux kernel.
