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1995, IBM acquired Lotus Development and Microsoft Excel is the spreadsheet market leader.

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1995, IBM acquired Lotus Development and Microsoft Excel is the spreadsheet market leader.

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Lotus had acquired all rights.

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In January of 1987, Lotus Development filed suit against Paperback Software and separately against Mosaic Software claiming they had infinged on the Lotus 1-2-3 spreadsheet software

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In 1989 Excel was Microsoft's flagship product

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When Microsoft launched the Windows operating system in 1987, Excel was one of the first application products released for it.

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In 1983, the company reported revenues of $53 Million and had a successful public offering. In 1984, Lotus tripled in revenue to $156 Million.

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Beginning in September 1983,  Mitch Kapor developed Lotus and his spreadsheet program quickly became the new industry spreadsheet standard

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In 1961, Professor Richard Mattessich pioneered the development of computerized speadsheets for use in business accounting

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In May 1979, Fylstra and his firm Personal Software (later renamed VisiCorp) began marketing "VisiCalc" with a teaser ad in Byte Magazine.

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By the fall of 1978, Bricklin had programmed the first working prototype of his concept in integer basict