Today's author: David Gainer, a Program Manager on the Excel team. PivotTables are designed to help users make sense of large amounts of data by providing an easy way to build a summarized report. In addition, PivotTables can be rearranged easily, so that once you have some summary data in a PivotTable, you can look at the same information in many different ways with only a few mouse clicks. For a slightly less brief overview of PivotTables as well as a list of the improvements made to the application...