Microsoft Office XML defective?

There's been quite some controversy around the standardisation efforts from Microsoft about its Office XML formats, but for outsiders, practical illustrations of what was wrong was hard to find. This is over now with a practical study, with real examples from Stéphane Rodriguez. It is surprising to see stored values different from the values actually entered in a product as Exel.

This is a good complement to comparisons of OpenOffice's Open Document Format (ODF) and Microsoft's Office Open XML(OOXML).