Of course, such a powerful and essential tool cannot be left unmonitored. From a cashier at the local supermarket to a data analyst at a giant corporation, there are few jobs that do not require the constant use of a PC in some way. Today, in our hyperconnected society, these programs are the cornerstone of the modern workforce. Through the decades, the use cases for PCs in the workplace increased: word processing (WordStar), database management (dBase), design (PageMaker), stock keeping, sales, etc. Needless to say, it opened the doors for competitors like Lotus 1-2-3, on DOS, and eventually Microsoft Excel on Windows. More than 700,000 copies of VisiCalc were sold until 1985, with maybe 1 million copies sold throughout its history. It quickly became the first “killer app”, one so compelling that companies were willing to spend US$2,000 on Apple II computers for their finance and accounting teams, just so they could run VisiCalc, which retailed at US$100. On October 17, 1979, a software publisher called VisiCorp launched a product that would change offices forever: VisiCalc, a spreadsheet program that turned the personal computer (PC) from a mere curiosity into a legitimate business tool.
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