It’s official : Microsoft’s Office Open XML (OOXML) document format, used in its Office 2007 suite, has been approved as a standard by a Joint Technical Committee of the International Standardization Organization (ISO) and the International Electrotechnical Commission (IEC). Microsoft confirmed that it was successful in making OOXML an ISO/IEC standard. 75% of the “participating” members voted in favor of the standardization. Microsoft claimed that the voting results were “well above” ISO/IEC requirements. The competing Open Document Format (ODF) was approved as ISO standard in May of 2006. Here is official: Ecma Office Open XML Document Format Appears to Win Approval as an ISO/IEC Standard: Final vote appears overwhelmingly in favor; input from 87 national bodies contributed to an improved specification.