From Halopedia, the Halo wiki
The Microsoft Store is a multi-platform webstore developed by Microsoft. The Store is natively integrated into Windows 10, Xbox 360, Xbox One, and the upcoming Xbox Series X, but it can also be accessed from the web. The Microsoft Store offers products, games, and services sold by Microsoft and third parties. If a game is both on Xbox and PC, it may be dubbed as "Play Anywhere", allowing for seamless crossplay and universal save files.
The Microsoft Store currently offers the following official Halo items:
Xbox 360/Backwards Compatible
Movies and TV