https://techcrunch.com/2017/10/03/microsofts-mixed-reality-platform-is-now-open-to-steamvr-developers/

It’s no secret that Microsoft’s Mixed Reality platform will support SteamVR games over time. That’s a big deal because Steam is, after all, the largest store for buying PC games and Microsoft needs a large catalog of VR games to jumpstart its ecosystem. Until now, though, we didn’t really know what the timeline for this would look like.

As the company announced at a small press event in San Francisco, developers now have access to the Windows Mixed Reality SteamVR preview to help them test their games. This holiday, consumers will also gain access to this preview program.