Microsoft becomes a part of the project ODF-converter: it’s hosted on Sourceforge (M$ on Sourceforge ?!?!?!? What’s next time? Bush that fight on a real battle-field??!?!? 8O ).
If ODF does not give you any “trigger”, read here. Anyway, the most important thing to know is the interest of M$ to release various plugins to enjoy conversion between her proprietary-formats and Open Documents of OASIS.