This rule compares each value in column A to its counterpart in column B. If they're not the same, Excel highlights the value in column A. To highlight the values in column B instead, select the values in column B and update the rule formula to reference the values in column A.
Susan Sales Harkins is an IT consultant, specializing in desktop solutions. Previously, she was editor in chief for The Cobb Group, the world's largest publisher of technical journals.