The following customization issue causes a minor loss of fidelity:

Issue Solution
This workbook contains a customized Quick Access Toolbar and/or custom user interface parts that are not supported in earlier versions of Excel. These custom features will not be available in earlier versions of Excel. Because the Ribbon user interface in Excel is very different from the menus and toolbars in earlier versions of Excel, any customizations that were made in Excel are not available in earlier versions of Excel.

In earlier versions of Excel, you can add similar custom commands to toolbars and menus.