Chapter 2. Managing Workbooks
Save a Workbook
You can save your workbook so that you can use it at another time in Excel 2007. Excel 2007 uses a new file format that is XML-based. The new file format reduces the size of a workbook, which improves the likelihood of recovering information if a file becomes corrupted.
By default, Excel saves new workbooks in the new file format, assigning an extension of .xlsx to the workbook. However, if you open a workbook created in Excel 97-2003, make changes, and save the workbook, Excel assumes that you want to save the file in Excel 97-2003 format with a file extension of .xls.
To help you work with others who have not yet upgraded to Excel 2007, you can save a copy of an Excel 2007 workbook in Excel 97-2003 ...
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