This would theoretically allow PC, Xbox One, Switch, and mobile games to all co-exist and share the same service for multiplayer, voice comms, and achievements, allowing owners of any of these platforms to play together.
Microsoft has been slowly opening up the Xbox platform's walled garden for years now.
According to a listing on the GDC 2019 schedule (which has since been edited to remove the juicy details), Microsoft will soon be announcing plans to roll out Xbox Live to Nintendo Switch and iOS and Android devices.
The biggest change here is that Microsoft is seemingly willing to offer Xbox Live cross-platform services to third-party developers. This has been tested in one game already, with Minecraft tapping into Xbox Live across all three new platforms.
Microsoft has plans to grow its Xbox Live service by expanding the online subscription's features to the Nintendo Switch and mobile devices through a new cross-platform development program.
The annual Game Developers Conference, GDC, is taking place mid-March, and a talk scheduled by Microsoft has revealed something incredibly interesting. Until now, Microsoft reserved Xbox Live support on those platforms for its own games, but now now, Microsoft is aiming to bring Xbox Live cross-platform play to even more titles.
It's a unusual and wonderful new video game industry we find ourselves in 2019.
The lecture is meant to introduce developers to the software, and sell them on why they should include it in their games.
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The "XDK" is aimed at "game services engineers looking to save time & expand their customer base by letting Microsoft managed game services handle social, communication, and multiplayer interactions across billions of screens".