Excel 2007 introduced the new xlsx format to the Office suite. Opening these files in Excel 2003 often gave users an error message until they downloaded the compatibility tool. Once the compatibility tool is downloaded, these files can be opened in Excel 2003. This compatibility tool is available for download from Microsoft’s website and is free. The compatibility tool made it possible for all Office 2003 products to work with Office 2007 new file formats. Writer Bio
