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In page Cambridge, Massachusetts:

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After the 1950s, the city's population began to decline slowly as families tended to be replaced by single people and young couples. In Cambridge Highlands, the technology company Bolt, Beranek, & Newman produced the first network router in 1969 and hosted the invention of computer-to-computer email in 1971. The 1980s brought a wave of high technology startups. Those selling advanced minicomputers were overtaken by the microcomputer.[citation needed] Cambridge-based VisiCorp made the first spreadsheet software for personal computers, VisiCalc, and helped propel the Apple II to consumer success. It was overtaken and purchased by Cambridge-based Lotus Development, maker of Lotus 1-2-3 (which was, in turn, replaced in by Microsoft Excel).