If you routinely share files with someone using an earlier version of Excel, set Excel to save your workbooks to a more convenient format.
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On the Excel menu, click Preferences.
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Under Sharing and Privacy, click Compatibility.
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On the Save files in this format menu, select the file format that you want to use.
Notes:
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After you specify the default file format, all new workbooks are saved in the selected file format unless you specify a different format in the Save As dialog box when you save a workbook.
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Some features and formatting might not be available if you save the workbook in the file format of an earlier version of Excel or another spreadsheet program.
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