The Open Document Society has published in its February newsletter that Microsoft has an "ODF standards group" within the Microsoft Office team:
OpenDoc Society wants to enable ODF for Microsoft customers
As we announced by mail to you earlier this month, OpenDoc Society is currently trying to set up a business relationship with American software vendor Microsoft - the company behind the Windows operating system and the Microsoft Office suite, to name a few of their products. We want to give their customers easier access to the Open Document format and related standards, and are eager to work together with Microsoft to lower the barrier to become part of the ODF community. Latest news sent to us by John Calhoon at Microsoft is that the proposal is under investigation by the (new?) "ODF Standards group" within the Microsoft Office team. We hope to be able to bring you good news soon, and also hope to be able to get more information out about the exciting implicit news that Microsoft is working actively on ODF too.
And for the millions users of Microsoft Office who are not yet fans of the Saw4 movie, he would say: