The Mixed Reality Forums here are no longer being used or maintained.
There are a few other places we would like to direct you to for support, both from Microsoft and from the community.
The first way we want to connect with you is our mixed reality developer program, which you can sign up for at https://aka.ms/IWantMR.
For technical questions, please use Stack Overflow, and tag your questions using either hololens or windows-mixed-reality.
If you want to join in discussions, please do so in the HoloDevelopers Slack, which you can join by going to https://aka.ms/holodevelopers, or in our Microsoft Tech Communities forums at https://techcommunity.microsoft.com/t5/mixed-reality/ct-p/MicrosoftMixedReality.
And always feel free to hit us up on Twitter @MxdRealityDev.
How to develop for Windows Mixed Reality HMD Natively using UE 4.22.1
Finally, after another two years and in 2019, we have a version of the Unreal Engine which supports Windows Mixed Reality headsets HMD directly and allow the development of games on the Unreal Engine instead of Unity
On 29th April 2019 Version, Unreal 4.22.1 and Windows Mixed Reality, WMR, for SteamVR version 1.3.23 for HP VR1000 HMD with Motion Controllers and the other WMR HMD devices like Samsung etc was released.
Use the Epic Games Launcher to get the latest binary version to install on the Windows 10 Professional April 2018 update or build 18362.63 onward.
WMR VR support now natively supports the Windows Mixed Reality for SteamVR Beta Updated team 1.3.23 https://docs.unrealengine.com/en-US/Platforms/VR/WMR.
This natively supports all WMR HMD headsets example HP WMR HMD VR1000, using the UE Editor VR preview function into your HMD display.
The slowness encountered has now been fixed and you can run Steam VR games natively in your HMD as the Introduction to VR Development using Unreal Engine 4 shows. This is simply completed by starting the desktop icon Windows Mixed Reality SteamVR after updating the Windows Mixed Reality SteamVR application from your desktop Steam icon.
The Windows 10 April 2018 version was the first version to support this and the recent version 1903 build 18362.63 onward added more Holographic updates.
Further to this running the native SteamVR will run most Unreal application for Showdown VR demo in your HMD headset.
NOTE The is NOT Hololens 1 or 2 support, that still requires 32bit UWP version and the Hololens Emulator
Although the latest buildable UWP version Unreal Engine Merge tag '4.20.3-release' into release_uwp is available for those developers registered with Epic for HoloLens development. This still needs significant build time (>18 hours) to produce a working UWP version and is an unsupported ATG version. If you are NOT a registered Epic developer you will receive a web error 404 "page not found" on the links above because the repository is marked private as is all Epic development repositories.