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The first desktop and mass-market computer. In 1964, the first desktop computer, the Programma 101, was unveiled to the public at the New York World's Fair. It was invented by Pier Giorgio Perotto and manufactured by Olivetti. About 44,000 Programma 101 computers were sold, each with a price tag of $3,200.
Microsoft's roots go back at least as far as 1975, when the first commercially available personal computer appeared on the cover of Popular Electronics magazine. The Altair 8800 was a rudimentary system, but it found a market for home-based computers and created a new demand for software to use with these systems.