I knew that Microsoft would make at least one mistake with vista and all the new software they have released. When reading up on office 2007 I saw something about the errors in excel 2007, Microsoft has reported that the problem exists in the display of six specific floating point values between 65534.99999999995 and 65,535, and six values between 65535.99999999995 and 65,536.
Any calculation that results in one of these twelve values will be displayed incorrectly. The actual value stored and passed to other cells is correct, only the displayed value is wrong. As of September 26, 2007, Microsoft reportedly has a fix, but it is still undergoing testing prior to release.