Windows Mixed Reality Headsets. (Microsoft Photo)

Microsoft revealed new details about its Windows Mixed Reality headsets this morning. The company confirmed that headset and motion controller bundles will be available for the holiday season starting at $399 from hardware makers HP, Lenovo, Dell, and Acer. The devices will work with PC systems that will start at $499.

But the big news is about the content. Games from Valve’s Steam platform will work on these Windows mixed-realty devices, and the company is working “to bring future Halo experiences into mixed reality,” through its 343 Industries game studio, confirmed Alex Kipman, the Microsoft technical fellow who oversees the initiative, in a post announcing the news.

The Steam integration is notable because of Valve’s major role in PC gaming, and its own partnership with HTC on the Vive virtual reality headset. Windows Mixed Reality devices are designed to make augmented and virtual reality more affordable than higher-end devices including the Vive, the Oculus Rift and Microsoft’s own HoloLens.

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