Office Open XML (OOXML), Microsoft's answer to the upstart open source Open Document Format (ODF), has passed to the nextOffice Open XML (OOXML), Microsoft's answer to the upstart open source Open Document Format (ODF), has passed to the next hurdle on its way to fast-track ISO standardization just like ODF: a five-month-long ballot by the national members of ISO and the International Electrotechnical Commission (IEC) that stays open until September 2. hurdle on its way to fast-track ISO standardization just like ODF: a five-month-long ballot by the national members of ISO and the International Electrotechnical Commission (IEC) that stays open until September 2.