As promised, Microsoft has released its official Remote Desktop app for Android and iOS to coincide with the launch of Windows 8.1. The app is free to download and use, and just like the many third-party remote desktop clients, it allows you to access your Windows PC remotely from your smartphone or tablet.

In a move that’s sure to upset some third-party app developers, Microsoft is planning to launch official Remote Desktop apps for Android and iOS later this month. Like the Remote Desktop solutions for Windows and OS X, the apps will allow you to connect to your PC and control it remotely from your smartphone and tablet.

Samsung has today announced that its cross-platform ChatON messaging service now boasts over 100 million users across Android, BlackBerry, iOS, and Windows Phone. It’s taken just two years for the service to become more popular than BBM, once one of the biggest names in instant messaging, and it continues to grow at an impressive rate.

Wunderlist, the hugely popular cross-platform productivity app that now boasts over 5.3 million users worldwide, got a new feature called Comments this week, which brings the conversation to your to-do list. If you use Wunderlist in a professional environment, you can now discuss tasks and projects with your team within individual to-dos.

What’s more, you can now try Comments — as well as Files and Assigning — for free for a limited time, without signing up to Wunderlist Pro.

Microsoft has today launched Xbox Music on Android and iOS almost a year after the music streaming service made its debut alongside Windows 8. The apps allow subscribers to stream tens of millions of songs straight to their mobile devices, and create playlists that sync across your smartphone, tablet, PC, and Xbox 360.

Microsoft has also updated its Xbox Music web app to offer free, ad-supported streaming for all.