Microsoft loves Open Source Software

http://www.microsoft.com/resources/sharedsource/Articles/MicrosoftandOpenSource.mspx#EKB

Microsoft has been learning from the OSS community regarding the benefits of deeper collaboration and increased transparency leading to better communication with customers. We believe the most effective pathway for a commercial software company is to strike a balance between investing in research and development and the release of intellectual property assets in the form of source code for both reference and collaborative purposes.