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Excel receives competition from other spreadsheet products in the summer of 1992.

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Excel was Microsoft's flagship product. For nearly 3 years.

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Dan Bricklin is working at Interland, Inc. Lotus gave him permission to post a working copy of the 1981 IBM PC version of the VisiCalc spreadsheet program.

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

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Jim Manzi had become CEO at Lotus in April 1986 and in July 1986 Mitch Kapor resigned as Chairman. The spreadsheet entrepreneurs were moving on

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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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Many companies had introduced spreadsheet products. Bill Gates had joined the fray with the innovative Excel spreadsheet.

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Bricklin had programmed the first working prototype of his concept in integer basic. T

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Professor Richard Mattessich pioneered the development of computerized speadsheets

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Daniel Bricklin, came up with the idea for an interactive visible calculator.