Conditional formatting in Excel is a powerful tool that allows you to dynamically format cells depending on the values of that or other cells’ data. In Excel 2007 the conditional formatting engine was re-written, opening things up to allow more than 3 conditional formats on any cell, as well as conditional formats that could overlap ranges. All in all, these were fantastic improvements that can lead to some very versatile and useful worksheets.

Unfortunately, the user interface to control conditional formatting is not the most intuitive. The purpose of this article is to help you understand the way Excel applies rule precedence so that you can build powerful formatting rules of your own, without getting frustrated along the way.
...