What format is Microsoft excel format?

GO TO THE MENU BAR "FORMAT" CHOOSE CELL, CHOOSE NUMBERS TAB

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MS Excel 2003 and earlier use the XLS format. MS Excel 2007 and later use the XLSX format.

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A conditional format is setting a format on a cell that is based on a condition, normally a value in a cell. So you might want to do something like colour a cell differently if it is over a certain...