The Format War Origins.
Since Sony had no rival video codec software to push, and Microsoft had no real hardware interests to defend, why were they battling for the next generation of video discs rather than working together on a joint standard? Initially, Microsoft did work with Sony. However, the rest of the industry working with Sony on Blu-Ray rejected portions of Microsoft’s technology, sending the company into a furious rivalry against Blu-Ray.
A follow up article on the origins of the format war presented Microsoft’s efforts to push its Windows Media and WinCE as essential, proprietary aspects of both the new HD disc formats. While Microsoft successfully wrote Windows Media (aka VC-1) into the specification of both Toshiba’s AOD and Sony’s Blu-Ray, the Blu-Ray consortium members later selected Java-based technology from Sun as its interactive menu layer rather than Microsoft’s WinCE/HDi.