Converting an Existing Workbook
When you open a workbook from 97-2003, Excel 2013 goes into compatibility mode—indicated on the title bar—where it disables new features that cannot be displayed or converted well by previous versions. When you save a workbook, Excel 2013 saves Excel 97-2003 files in their older format using compatibility mode. The workbook stays in compatibility mode until you convert it to the Excel 2007-2013 file format. Excel 2007, Excel 2010, and Excel 2013 use the same file format, so you don’t need to convert files between them.
Convert an Excel 97-2003 to Excel 2013
Open the Excel 97-2003 workbook you want to convert to ...
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