In 1980, Gates and Allen signed an agreement to provide an operating system for IBM’s first personal computer. After presenting its MS-DOS PC in 1981, Windows came along in 1985 and, by the end ...

Fifty years ago, on April 4, 1975, Bill Gates and the late Paul Allen founded Microsoft. A half century later, it’s one of the world’s most valuable companies. And even though it’s based in ...

Soon after, the company secured a deal to provide the operating system for IBM’s first personal computer, and by the late 1980s, Microsoft was the world’s largest personal-computer software ...