Link? Everything I have seen says they are not planning on implementing ODF. Any old XINO format does not an ODF make.. But pending your link: Good for them, if MS meets the tech spec MA demands then I guess it should just come down to a straight TCO decision..
http://www.microsoft.com/office/preview/developers/filefaq.mspx
Open and Royalty-free Specification
Office XML Formats are based on industry standard XML and ZIP technologies, support full integration by any technology provider, and are available via a royalty-free license. Format specifications will be published and made available under the same royalty-free license that exists for the Microsoft Office 2003 Reference Schemas—openly offered and available for broad industry use.