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Summary
Name	Microsoft Office Open XML
Version	2007 onwards
Other names
Identifiers	PUID: fmt/189
Family
Classification	Aggregate
Disclosure
Description	Microsoft developed office Open XML (OOXML) in 2007. It is an XML based format representing a departure from previous Microsoft Office suites, which were binary file based. Starting with Microsoft Office 2007, the Office Open XML file formats have become the default file format of Microsoft Office. The ISO standard for OOXML is ISO/IEC DIS 29500. An OOXML file format consists of a compressed zip archive that is designated according to which file type it is. OOXML uses three custom XML based languages to describe its’ three document types. WordProcessingML, SpreadsheetML and PresentationML are each used to describe Word, Excel and PowerPoint Presentation files respectively. OOXML is not an open format but the specification and development rights have been released under Microsoft’s Covenant not to Sue. OOXML is platform independent.
Orientation	Binary
Byte order
Related file formats	Has priority over ZIP Format
Technical Environment
Released
Supported until
Format Risk
Developed by	Microsoft Corporation
Supported by	Microsoft Corporation
Source	Digital Preservation Department / The National Archives
Source date	06 Oct 2009
Source description
Last updated	06 Oct 2009
Note