Office Open XML is a xml format created in 2006.

Office Open XML (also informally known as OOXML or Microsoft Open XML (MOX)) is a zipped, XML-based file format developed by Microsoft for representing spreadsheets, charts, presentations and word processing documents. The format was initially standardized by Ecma (as ECMA-376), and by the ISO and IEC (as ISO/IEC 29500) in later versions. Starting with Microsoft Office 2007, the Office Open XML file formats have become the default target file format of Microsoft Office. Read more on Wikipedia...

• Office Open XML Wikipedia page
• Office Open XML docs
• Office Open XML first developed in Microsoft
• See also: (2 related languages)XML, Microsoft Excel