Microsoft has decided to end support for its Office Mobile app on a few old versions of Android. Starting today, you’ll need Android 6 or higher to install Office mobile on your smartphone.
Office for Android can be installed on tablets and phones running any of the supported versions of Android and have an ARM-based or Intel x86 processor. Starting on July 1, 2019, support will be limited to only the last 4 major versions of Android.
Those of you running older than Android 6 will be able to use the app, but will not receive any update from Microsoft. To get the full support, you’ll have to update your operating system to supported versions that are Android 6 or newer.