If you'd like to gain early access to updates and test new features, then we'd love to have you as a Microsoft To-Do Insider on our Windows 10, Android and iOS beta apps. It's easy to easy to get started:
To download our Windows beta app, you just need to become a Windows Insider. You can join the program by visiting Insider.Windows.com
For Android, you can get our beta app by joining our public Android Insiders group here.
For iOS, you'll first need to install TestFlight on your iOS device. You can find it in the App Store or just click here. Once TestFlight is installed, just visit https://testflight.apple.com/join/JSq3UkAz from your device. You'll then be able to download and install our beta app via TestFlight.