To become a Windows Insider go to https://insider.windows.com/.
Microsoft Apps, now available in the Google Play store, provides an easy way to browse all of Microsoft's Android offerings across categories like Productivity, Education, Entertainment, Communication, and News. You can also discover apps that you never knew existed, as well as brand new additions to the Microsoft family.
• Browse all the apps from Microsoft on Android in one simple experience
• See what apps you already have installed; find new and popular downloads
• Browse by category
• More coming soon