New to Microsoft Excel? Looking for a tip? How about a tip so mind-blowingly useful as to qualify as a magic trick? You're in luck. In this MS Excel tutorial from ExcelIsFun, the 631st installment in their series of digital spreadsheet magic tricks, you'll learn how to add conditional formatting to a transactional record when the date is 90 days past due using the TODAY function and mixed cell references in a logical TRUE-FALSE formula.