If you are into conspiracy theories you'll look for hidden purposes in this Microsoft press release. Probably there are many of them, but at the end I think this initiative from Redmond is a success for everybody in the IT industry, first of all for the open source communities.
I especially look forward to the implementations related to these two actions: "Ensuring open connections to Microsoft’s high-volume products" and "Documenting how Microsoft supports industry standards and extensions".
Specifically with the former I expect/hope to see in the near future a full compatibility with Microsoft Exchange for mail and calendaring client apps (Apple iCal to start with); the latter should ease the complete support of Office documents: much better than resort to reverse engineering each time.
Wait and see...