Describes the cause and action for error messages.
2007 unable to save as xlsx
How to troubleshoot errors when you save Excel workbooks
How to Fix Excel File Error 'The document cannot be saved'
Save a workbook in another file format - Excel - Office Support
Save an Excel workbook for compatibility with earlier versions of Excel ...
could not be saved sharing violation EXCEL SOLVED - YouTube
Microsoft Excel: the file is corrupted and cannot be opened - 2016 ...
Cannot get out of compatibility mode in Excel 2007 - Super User