Upgrade from standard Excel workbooks to specialized formats that shrink, shield, and streamline your spreadsheets.

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.

When Microsoft rolled out Office 2007, the company made some fundamental changes to its file formats, updating them from binary files to XML-based packages. The default format for Excel 2007 followed ...

When most users open Office 2007’s Excel—launched with Microsoft’s new Vista operating system—their first reaction is, “ Where’s the file menu? How do I begin?” This article is designed to help you ...

Excel files bloat from ghost used ranges, formatting, pivot caches, and images. These quick fixes massively cut the size of ...