Install Office Mobile apps on a Windows 10 device
The Office Mobile apps (Excel Mobile, PowerPoint Mobile, Word Mobile, and OneNote) might be installed on your Windows device already. But if you just upgraded to Windows 10, or purchased a new device, you may want to install them. You can also learn how to Set up Office apps on Windows Phone here.
Note: These apps are best for reading and quick editing on devices with a screen size of 10.1 inches or smaller. If you want the full range of editing capabilities, use the desktop versions of the Office apps (for example, Excel 2016, PowerPoint 2016, Word 2016 and OneNote 2016).
Install the apps
You can install the apps from the following Windows Store locations:
The first time you install an app from the Windows Store, you will be asked to sign in with a personal Microsoft account or the work or school account that you use with Office 365. For help setting up your Office apps see, Set up Office apps on Windows Phone.
When the apps are installed, you'll see them at your Windows Start Screen. Tap the All Apps button and then tap any one of the apps you downloaded.
Note: If you're using Windows 10 Mobile, from the Start screen, swipe to the right to see all your apps. Then, tap the one you want to open it.