They've started in New Zealand. Only a description is currently available but the patent is for saving word processor documents as a single XML file that can be accessed by software that understands XML. [link|http://www.nzoss.org.nz/portal/modules.php?name=News&file=article&sid=284| More Info Here].
OK, now we wait for andread to explain that this is just further evidence of Microsoft's total commitment to open standards.