Not everyone is completely eager to embrace the OpenDocument standard that was recently adopted as an industry standard by ISO and IEC. The European Commission is a bit reluctant, citing some fairly ambiguous reasons:
"It is highly probable that we will strongly recommend the use of open document formats to public administrations. On the other hand, it is unlikely that we will make a specific recommendation, in case we will have two ISO standards at a later point in time," said the source. "It is likely that we will urge industry players to provide compatibility between formats, and in the long run to aim for one single format."
Could this have anything to do with Microsoft's Open XML? You can't blame them for considering their options, at least.