Microsoft Windows 3.0 shipped September 1990 with signature term and agreements.

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Microsoft Windows is a group of coputer system families, all of which are developed, marketed, and sold by Microsoft. Windows came to dominate the world's personal computer (PC) market from september 1990 with over 90% market share, overtaking Mac OS, Microsoft started working on Windows 1.0 in 1983 and released it in 1985. It wasn’t a real operating system, Microsoft Windows 3.0 shipped September 1990 with signature term and agreements.IBM and Microsoft end co-operative work on operating systems, dividing up work-to-date between them, in a series of cross-licensing agreements. Microsoft will work on Windows, DOS, and a portable version of OS/2. IBM will continue development of 16-bit (v1.x) and 32-bit (v2.0) Apple Computer discontinues many of it’s Macintoshes. US District Court throws out 5 of 6 claims in Xerox’ suit against Apple Computer. More than four million copies of Windows were distributed in its first year, sparking the release of more than 1,200 Windows-based applications from other developers. Windows 3.0, released in 1990, improved the design, mostly because of virtual memory and loadable virtual device drivers (VxDs) that allow Windows to share arbitrary devices between multi-tasked DOS applications.[citation needed] Windows 3.0 applications can run in protected mode, which gives them access to several megabytes of memory without the obligation to participate in the software virtual memory scheme. They run inside the same address space, where the segmented memory provides a degree of protection. Windows 3.0 also featured improvements to the user interface. Microsoft rewrote critical operations from C into assembly. Windows 3.0 is the first Microsoft Windows version to achieve broad commercial success, selling 2 million copies in the first six months.



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