I agree that if you're out protesting MS's OOXML office format with signs, you're probably a looser, but they have a point.
The International Standards Council decides who which file formats qualify as Open, and therefore will be bundled into Open-type programs. MS wants their format to be included, so they don't get left behind in the Office file format revolution.
However, the only way they could get their scam XML file format voted as "open" was pretty much by bribery. The OpenFormat, which truly is open, not hiding behind patents and copyrights, and fully falling under the GPL.
MS Office products doesn't even support the ODF, while Open Office Suites all support the old .doc formats, and most have plugins which support OOXML (like .docx). It's a scam, and a shame that MS's BS fake-open format as accepted.