Some features can't be saved in earlier versions of Excel

Cause: The workbook includes features that are not recognized by this version of Excel. These features will be lost if you save the workbook in earlier file formats.

Solution:    To preserve the workbook, do not save it in earlier formats, such as .xls. Instead, save the workbook in formats such as .xlsx, .xlsm, .xltx, .xltm, or .xlam.

See also

File formats for saving workbooks

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