May 26, 2010: In a massive milestone, Apple passes Microsoft to become the world’s most valuable technology company for the first time.
The changing of the guard proves particularly amazing given that, just 15 years earlier, Apple looked close to dead, while Microsoft dominated the tech world thanks to Windows 95.

May 12, 2005: Longtime Apple frenemy Bill Gates tells a German newspaper that Apple may have hit it big with the
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.
March 17, 1988: Apple sues Microsoft for allegedly stealing 189 different elements of its Macintosh operating system to create Windows 2.0.
February 11, 2010: With iPad excitement reaching a fever pitch, Microsoft co-founder Bill Gates wades in with his opinion of Apple’s tablet. His view? Apple’s upcoming device is kinda meh.
January 13, 2000: Steve Jobs’ longtime frenemy Bill Gates quits as Microsoft CEO, stepping down just a month after his company’s stock hit its all-time high.
December 30, 1999: Microsoft hits the height of its 1990s dominance and begins its early-2000s decline, clearing a gap at the top for Apple.
November 26, 1984: Microsoft co-founder Bill Gates praises Apple’s newly arrived Macintosh as the future of personal computing.
November 21, 1985: Following
August 26, 1991: In their first joint interview, Steve Jobs and Bill Gates trade barbs and debate “the future of the PC” in Fortune magazine.
August 21, 2008: Microsoft recruits comedian Jerry Seinfeld for a series of ads. It’s a naked attempt to shake the company’s reputation as a stodgy oldster (as opposed to Apple’s trendsetting hipster image).
August 6, 1997: In one of the most famous moments in Apple history, Steve Jobs reveals a $150 million Microsoft investment that saved his company from ruin.
July 25, 1989: Apple suffers a major setback in its copyright-infringement lawsuit against Microsoft for allegedly stealing the Mac’s “look and feel” to create Windows.
June 25, 1985: Microsoft co-founder Bill Gates sends a memo to Apple execs suggesting that Cupertino should license its Mac operating system and additional technology to other companies.