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Re: Compatibility error for charts?
Not a Mac user, but this is not much different from the PC version of saving a .xlsx to a 97-2003 format.
For the specific file in question you need to do a Save As and save it as an Excel 2008 file (.xlsx). This will prevent recurrence of the warning message.
Next, go to your Excel options and change the default file format to .xlsx so that all future workbooks will be automatically saved to the latest format.
However, if you open older workbooks and user newer features/function not supported in prior version you will again receive the warning. So, if you don't need to maintain backward compatibility or share files, just Save As to the newer format.
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