The ISO organization announced in its press release that despite of appeals OOXML now is an official standard.

Press release:
http://www.iso.org/iso/pressrelease.htm?refid=Ref1151

Quote:
The two ISO and IEC technical boards have given the go-ahead to publish ISO/IEC DIS 29500, Information technology – Office Open XML formats, as an ISO/IEC International Standard after appeals by four national standards bodies against the approval of the document failed to garner sufficient support.

So the appeals did not get enough support to stop the ISO certification process and Office Open XML can now be used even if you have policies active (often governmental departments) that say only to use ISO standards.