I think MS will eventually come around, look how long it took them to finally acknowledge pdf. To me, this ODF is a great idea and I can't really think of a downside for it.
Well PDF will not get them where they want to get *especially if you can not open and edit the docs*. But the PDF license is open and yet protected enough to prevent MS from embracing and extending. ODF might be another story..
Start with the fact hardly anyone other than leftist fanatics currently has it, add to it the fact that more leftists up in the state of Mass are now pushing it, and work your way down from there.