Multiple choice general knowledge history When was Microsoft founded? 1971 1975 1977 1979 Reveal answer Fill a bubble to check yourself B Correct answer Explanation Microsoft was founded on April 4, 1975 by Bill Gates and Paul Allen in Albuquerque, New Mexico. The company's first product was a BASIC interpreter for the Altair 8800 microcomputer. 1975 is the correct founding year.