My dad used to work for Microsoft. 
Did he work at headquarters? It is located in Redmond, Washington.
Yes he did.
Microsoft was founded on April 4, 1975 by Paul Allen and Bill Gates. I'd say it's a fairly new company.
Yes it is fairly new still and a great success.
It got most popular starting in the mid-1980s because of MS-DOS, and then Microsoft Windows.
My dad started working for them in 1978.
Windows. The company's 1986 initial public offering (IPO), and subsequent rise in its share price, created three billionaires and an estimated 12,000 millionaires among Microsoft employees. Since the 1990s, it has increasingly diversified from the operating system market and has made a number of corporate acquisitions, their largest being the acquisition of LinkedIn for $26.2 billion in December 2016, followed by their acquisition of Skype Technologies for $8.5 billion in May 2011.
, Microsoft is market-dominant in the IBM PC compatible operating system market
to the State Route 520 and its floating bridge connecting Redmond to Seattle; the company did not want to delay the construction any further. Microsoft was ranked number 1 in the list of the World's Best Multinational Workplaces by the Great Place to Work Institute in 2011.
Corporate identity Headquarters.
The corporate headquarters, informally known as the Microsoft Redmond campus, is located at One Microsoft Way in Redmond, Washington. Microsoft initially moved onto the grounds of the campus on February 26, 1986, weeks before the company went public