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This week in history: Microsoft is founded
On 4 April 1975, Paul Allen and Bill Gates created Microsoft after writing a programming language for the world's first microcomputer.
Up until the early 1970s, computers were limited to huge mainframes, restricting access to large businesses and universities. However, the development of the early Intel microprocessors led to the creation of the MITS Altair 8800, the first microcomputer, which enjoyed a big success.
Paul Allen and Bill Gates approached MITS offering to write a programming language calledAltair BASIC. MITS founder Ed Roberts agreed, leading Gates to leave Harvard. Gates then set up Micro-Soft (later Microsoft) with Allen.
This was not their first company, since the duo had successfully run a company making traffic counters, while Gates was still at school. BASIC became extremely popular, though individuals copying the system without payment limited sales.
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Gates bought the rights to a system called QDOS and then produced a modified version, called PC DOS. He sold it to IBM, but Microsoft retained the copyright, which allowed it to sell the overall system (called MS-DOS) to companies that made PC clones.
In 1985, Microsoft released the operating system Windows. Initially a flop, the success of Windows 3.0 in 1990 gave the firm a virtual monopoly. Claims that it abused this position to crush rival internet browsers prompted a US antitrust suit in 2000.
It escaped with only minor concessions, but a similar dispute with the EU resulted in fines of €1.4bn. Despite this, Microsoft is now the world's sixth-largest listed firm.
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