The Kodi media streaming software, previously known as the XBMC or Xbox Media Center, didn't support the Xbox One when the console came out a few years ago.
If you have installed Kodi as a Media Server, just like it is the case with Plex, you can now enjoy it on your Xbox One as well. After 15 years they are back where things began.
Microsoft's desire to include UWP apps on the Xbox One, as well as Windows 10 devices, has given the Kodi team the ability to bring its software back to the platform it all started from, and makes the Xbox One an even more powerful media player.
The Digital Economy Bill, which was made law on April 27 2017, increased the punishment for those using the boxes for illegal means. Blu-ray and attached storage support is also a big missing feature, but I'm sure it'll only be a matter of time before those get added in as other Xbox One apps now support external storage. Due to the nature of how UWP works our hands are tied in some areas. For example, the software now only has "limited access" to a small portion of any given Xbox One's Video and Music folders and "Network support is limited to only NFS:// shares".
Other parts haven't even been finished yet, but the developers are working on getting the app up to what users expect. There might still be problems with certain general python modules that are used by add-ons and we are finding and reporting them to the developers as testing progresses. To download it, you can check out the individual links for United States and UK region to get the application added to your "Ready To Download" list on your Xbox One. I'm sure there's more that might not work as intended yet as there are so many features it just will take a while to go over them. Like we said it's early in development, so there are some missing features and bugs in this rough version.
Have you tried the Kodi Xbox One alpha app on your Xbox One yet?