We can only hope that they use XML "standards" for their default file formats. If they do, we will no longer have anything to complain about, and finally other Office systems (OpenOffice) will be able to read Microsoft files perfectly. My experiences with Microsoft in the past tells me that they will somehow muck with the XML standard and proprietize it in some way that will continue to make compatibility impossible. Maybe like embedded binary within the XML? We'll just have to wait and see...