A young, calm and very confident Bill Gates talks about Lotus, Excel, competition, IBM, Windows, OS/2, his vision for the PC industry, CD ROMs, running a business, hiring smart people, being called a "workaholic, " the challenges of business, and much more. (Minor color and sound correction )
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Microsoft went public on March 13, 1986, at an opening price of about $21 per share.
In 1987, at age 31, Bill was the youngest person to become a billionaire. That year, Microsoft surpassed Lotus as the world’s largest PC software company.

In 1987, Microsoft employed about 1,800 people. Among their 1987 releases were OS/2 (text version), Windows 2.0, the Personal System/2 (or PS/2), and others.

(This is a clip from a news interview from 1987. It is not clear who the interviewer is.)