Excel's Compatibility Checker runs automatically when you attempt to save a workbook in the "Excel 97-2003 (*.xls)" format. The Compatibility Checker window warns you that your document may lose ...

The Compatibility Mode is the viewing mode in Microsoft Office applications, like Word, Excel, etc., that allows users open or view the documents created on other versions of Office applications.

Microsoft is adding a Compatibility Version system to Excel. This system should prevent new features and bugfixes from breaking old spreadsheets, though it may prove to be an annoyance for Office ...