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What computer program developed in the late 1970s convinced many people to buy their first computer?

Answer:

The VisiCalc spreadsheet program. Up until it was released in 1979 for the Apple II computer, the microcomputer or home computer had been nothing more than a trinket for hobbyists and engineers. When VisiCalc was released, it make the computer into a useful business tool and it quickly gained popularity.

First answer by Gadget Girl. Last edit by Gadget Girl. Contributor trust: 3 [recommend contributor recommended]. Question popularity: 1 [recommend question].