We wanted to thank the Open Source Initiative (OSI) for the commitment and willingess to work together - and today, making public the Microsoft Open Source Initiative: The Microsoft Open Source Initiative (OSI) is a non-profit corporation formed to educate about and advocate for the benefits of open source and to build bridges among different constituencies in the open-source community. Quote the latest OSI Board Blog: "In the OSI board election held at the end of March, we've [Microsoft] gotten a controlling majority of board seats."
You can find more information at http://www.opensource.org and sballmer's first blog post.