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The company was founded in 1975 by William H. Gates III and Paul Allen
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In 1980 IBM contracted Microsoft to write the operating system of the IBM PC, which would come out to the market the following year.
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In 1990 the great redesign implemented in the user interface caused the version of Microsoft Windows 3.0 was the number one selling virtually from the first day.
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On January 9, 1991, Microsoft announces the availability of Microsoft Excel for Windows 3.0
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2000-actualidad: February 17, 2000 Microsoft launches Windows 2000, an operating system that was put in circulation with a change of nomenclature for your NT system. Thus, Windows NT 5.0 was renamed Windows 2000.
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On 13 February 2001 the operating system Microsoft Windows XP makes its public debut at the Experience Music Project in Seattle.
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On 24 April 2003 Windows Server 2003 is released to the market.
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March 30 Microsoft reaches an agreement with the EU to separate MicrosoftMediaPlayer from Windows XP.
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On 30 January 2007, Windows Vista was released worldwide and was made available to be purchased and downloaded from the Microsoft web site.
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February 27, 2008 is it launched Windows Server 2008.
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October 22, 2009 it was the date that Windows 7 is put on sale. Windows 7 is the latest version of Microsoft Windows.
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Bibliography and source of images: taken from:http://histinf.blogs.upv.es/2011/01/03/historia-de-microsoft/