Goodbye, Lotus 1-2-3

Far faster than its competition, such as SuperCalc and Microsofts first spreadsheet, MultiPlan, Lotus 1-2-3 would become both IBMs and Microsofts first killer app. With the opening of the Intel architecture and MS-DOS to IBM PC clones, Lotus 1-2-3 became the essential application for the 1980s PC revolution.

via Goodbye, Lotus 1-2-3.