PowerPoint was not invented by Microsoft.

Wacky WorldExcel & Office

It was created by Forethought Inc. and released for the Mac in 1987 as “PowerPoint”. Microsoft bought the company the same year.

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Excel quietly supports a function it does not list: DATEDIF.Excel’s maximum column is XFD.Excel has 1,048,576 rows — exactly 2 to the power 20.