April 4, 1975: Microsoft is founded by childhood friends Bill Gates and Paul Allen. The software company destined to become a tech behemoth — and a major Apple frenemy.
A few years later, Microsoft will break through to the mainstream with Excel and Word, becoming a key developer of Macintosh software. Then comes the Windows operating system, looking suspiciously Apple-like. After Windows arrives, Microsoft and Apple will embark upon a long-running feud.