The conclusion of his article "Winning the OpenDocument vs. OpenXML war" is pretty the one I would recommend:
Basically, members of the free software community can and should do more than just watch the fight and rest on their laurels: the more people that fight, the more likely we are to win this battle, which is anything but over. We should all keep in mind that OpenDocument might become, even in the long term, a “fringe format” that nobody actually uses. Microsoft’s monopoly on file formats, if that becomes the case, would create unimaginable damage.
Some people are already reporting that Microsoft is pushing governments to adopt OOXML, and Massachussets is probably to first example of a long list.
Guys, we have 15 days left. It is a lot of seconds to convince your standard body.