Overview
The OpenDocument format (ODF) was accepted as a standard by OASIS in May 2005, and by ISO in November 2006, as standard ISO/IEC 26300:2006.
Microsoft submitted another format, Office Open XML (aka OOXML), to Ecma International where it was accepted as a standard in December 2006. The Office Open XML specification was published as standard ISO/IEC 29500:2008 in November 2008.
OpenDocument has been officially approved by national standards bodies of Brazil, Croatia, Denmark, Ecuador, Hungary, Italy, Malaysia, Russia, South Korea, South Africa and Sweden.
NATO with its 28 members (Albania, Belgium, Bulgaria, Canada, Croatia, the Czech Republic, Denmark, Estonia, France, Germany, Greece, Hungary, Iceland, Italy, Latvia, Lithuania, Luxembourg, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Turkey, the UK, and the USA) uses ODF as a mandatory standard for all members.
Read more about this topic: Open Document Adoption