Excel displays a warning message that the file format and extension don’t match (HTML table and XLS), but allows the user to open the file anyway. Today, users reported that these reports no ...

The Pivot Table is a tool that Excel uses to create custom reports from your spreadsheet databases. All you need is one common, unique field. Here's how to set it up with multiple spreadsheets.

If the table does not have headers, be sure to uncheck the My Table Has Headers option. Click OK and Excel will format the data range as a table. Any chart you build on the table will be dynamic.