Working on Excel with others doesn’t have to mean endless file versions and confusion. With co-authoring, version control, and recovery tools in OneDrive or SharePoint, you can collaborate in real ...

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XLS files are Excel workbook files created in Excel 97 or Excel 2003. The 2007, 2010 and 2013 versions of the program use the XLSX format by default to save workbooks, but can also use the XLS format.