Office Open XML

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Office Open XML (also informally known as OOXML) is a zipped, XML-based file format developed by Microsoft for representing spreadsheets, charts, presentations, and word processing documents. Ecma International standardized the initial version as ECMA-376. ISO and IEC standardized later versions as ISO/IEC 29500.

Microsoft Office 2010 provides read support for ECMA-376, full support for ISO/IEC 29500 Transitional, and read support for ISO/IEC 29500 Strict. Office 2013 and later fully support ISO/IEC 29500 Strict, but do not use it as the default file format because of backwards compatibility concerns.

Background

In 2000, Microsoft released an initial version of an XML-based format for Microsoft Excel, which was incorporated into Microsoft Office XP. In 2002, a new file format for Microsoft Word followed. The Excel and Word formats - known as the Microsoft Office XML formats - were later incorporated into Microsoft Office 2003.

Microsoft announced in November 2005 that it would co-sponsor standardization of the new version of their XML-based formats through Ecma International as "Office Open XML". The presentation was made to Ecma by Microsoft's Jean Paoli and Isabelle Valet-Harper.

File formats

• Microsoft Word - .docx, .docm
• Microsoft PowerPoint - .pptx, .pptm
• Microsoft Excel - .xlsx, .xlsm

See also

• Microsoft Office XML formats