Ok, the words "absolutely scary" come to mind with this Excel 2007 bug. Serious doesn’t even BEGIN to describe this problem. Ok, so putting in numbers that evaluate to 65535 get an incorrect return value. It’s specific, why should anyone worry? Weellll… That’s because now no one know what ELSE will evaluate incorrectly. What other number combinations will screw up? Could you imagine saying to a CEO that the company balances are wrong because of Excel is buggy?