Microsoft releases first Open XML SDK

Microsoft releases first Open XML SDK. But it does not support ISO.

The current SDK supports the version of Open XML supported by Office 2007, which is not the same as that ratified as a standard by the ISO, due to changes effected during the ratification process.

And,

At the same time, Microsoft said last month that it will begin supporting the rival Open Document Format (ODF) in Office 2007 and Office 14, beginning with a service pack set for release in the first half of 2009.