Bill Gates: Life down the ages

Bill Gates is one of the richest men in the world. Here we take a look at the whizkid who became a billionaire and a philanthropist.

Born in October 1955, Bill Gates grew up in Seattle with his parents, William and Mary Gates and two sisters. He attended public elementary school and the private Lakeside School, where he discovered his interest in software.

He was just 13 when he began programming the computer at the school and was excused from maths class to pursue his interest.

Gates soon became known as a computer expert in high school, and was part of a group of students who were trying to master the machine.

Among them was Paul Allen, who later co-founded Microsoft with Gates.

Gates was attending Harvard in 1975 when childhood friend Paul Allen showed up with a magazine featuring a mail-order computer kit. The two wrote a program for the new computer - the MITS Altair - without ever having seen one.

Allen flew to New Mexico the next day to show the program to the manufacturers, who were impressed and made the team an offer.

Gates dropped out of Harvard and he and Allen opened Microsoft's first office, in Albuquerque, New mexico.

In 1981, Bill Gates and Paul Allen hit it big when IBM used Microsoft's 16-bit operating system, MS-DOS 1.0, in its new personal computer.

Sales of the computer took off, and soon other manufacturers entered the market. Since Microsoft's deal with IBM wasn't exclusive, all those new computer-makers became potential clients.

In 1985, Windows 1.0 was released.

After a decade as a private company, Microsoft went public on March 14, 1986. The initial public offering price was $21 per share. The stock jumped 32.14 percent in its first day of trading, closing at $27.75.

The company subsequently grew into one of the world's most valuable companies, with a $236.4 billion market cap. There are now 6.4 billion shares held of the tech giant.

Bill Gates was officially declared a billionaire in Forbes' 400 Riches People in America issue in 1987.

At the time, he was worth $1.25 billion - $900 million more than the previous year. He was just 32 at the time, making him the world's youngest self-made billionaire.

In 1994, Bill Gates married Melinda French, a Microsoft employee who worked in the development of its multimedia products.

The couple exchanged vows on the island of Lanai, the smallest in the Hawaiian chain located nine miles off the coast of Maui.

In 1994, Melinda Gates formed the Tags: Melinda Gates , William H Gates Foundation , Bill , United States

Bill Gates and Microsoft went all out when they launched Windows 95 at a big party at the company's Redmond, Washington, campus.

Most notably, the fanfare included television commercials featuring the Rolling Stones' singing Start Me Up. Microsoft sold seven million copies in the first five weeks.

In 1998, Microsoft found itself at the centre of a courtroom battle, with Bill Gates as the star witness, after the US Justice Department filed an anti-trust lawsuit against the tech giant.

Microsoft was accused of trying to compel computer manufacturers to include Microsoft's web browser, Internet Explorer, on computers loaded with Windows 95.

More than three decades after dropping out of college, Harvard in June 2007 to receive an honourary degree.

He also delivered the commencement speech and challenged the graduates to combat the world's most pressing problems.

In 2008, Gates transitioned from his day-to-day role at Microsoft to working full time at the Steve Ballmer in 2000, remains Microsoft chairman.

In an effort to persuade other wealthy individuals and families to give a majority of their fortunes to charity, Bill Gates and his long-time friend and fellow billionaire Warren Buffett teamed up in 2010 to create the Giving Pledge.

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