Microsoft has taken further steps into the open source world. The company has made code for its Live Labs Web Sandbox available via open source under the Apache Licence 2.0.

Web Sandbox, which is a project for securing web content through isolation,  features technology for mashing up code while maintaining process isolation, quality of service protection, and security. It is intended to address a problem in which web gadgets, mashup components, advertisements, and other third-party content on sites either will run full trust alongside content or are isolated inside of IFrames. This results in many Web applications being intrinsically insecure with unpredictable service quality.

Since announcing the Web Sandbox at Professional Developer Conference 2008 in October, Microsoft has open-sourced the Web Sandbox framework and is partnering with industry leaders to evolve Web Sandbox into an industry-wide solution, Microsoft said.

Microsoft is looking for developers to experiment with Web Sandbox, even including samples so developers can try to break the Sandbox.

"Since the initial release of Web Sandbox we have received a great deal of feedback from the web security community. We have also been collaborating with a number of customers, partners, and the standards communities that would like to adopt the technology when it is ready. Our goal is to achieve widespread adoption of Web Sandbox and to help foster interoperability with complementary technologies like script frameworks," Microsoft Live Labs.

Although Microsoft is using an Apache license for the project, it is not sponsored or endorsed by the Apache Software Foundation, Microsoft said. The company last year became a sponsor of the foundation.

Web Sandbox builds upon Microsoft's experience with DHTML, Windows, Windows Live Web-based gadgets, and the Microsoft BrowserShield project, which leverages JavaScript virtualization through rewriting.