FSFE context briefing on the DIS-29500 Ballot Resolution Meeting (BRM) for Microsoft's Office OpenXML format: "When ECMA submitted MS-OOXML as ECMA-376 to ISO for fast-track approval, several countries criticised overlap with the existing ISO standard ISO/IEC 26300:2006, the Open Document Format (ODF). [...] Considering that alleged preservation of idiosyncrasies is the stated reason for the entire DIS-29500 ISO process, FSFE considers it worthwhile to investigate this claim in greater depth." /activities/os/msooxml-idiosyncrasies.html