I don't usually do this, but this time, here it goes: I'm quoting an entire press release, this time from ISO:
Four national standards body members of ISO and IEC – Brazil, India, South Africa and Venezuela – have submitted appeals against the recent approval of ISO/IEC DIS 29500, Information technology – Office Open XML formats, as an ISO/IEC International Standard.
In accordance with the ISO/IEC rules governing the work of their joint technical committee ISO/IEC JTC 1, Information technology, the appeals are currently being considered by the ISO Secretary-General and the IEC General Secretary who, within a period of 30 days (to the end of June), and following whatever consultations they judge appropriate, are required to submit the appeals, with their comments, to the ISO Technical Management Board and the IEC Standardization Management Board.
The two management boards will then decide whether the appeals should be further processed or not. If they decide in favour of proceeding, the chairmen of the two boards are required to establish a conciliation panel which will attempt to resolve the appeals. The process could take several months.
According to the ISO/IEC rules, a document which is the subject of an appeal cannot be published as an ISO/IEC International Standard while the appeal is going on. Therefore, the decision to publish or not ISO/IEC DIS 29500 as an ISO/IEC International Standard cannot be taken until the outcome of the appeals is known.
This, in other words, means that OOXML is NOT a standard.