What you need to know about the new Office app:
The App is free and simple and puts the tools that you use every day into a secure mobile experience that allows you to increase your productivity. The new Office app combines the existing Word, Excel, and PowerPoint mobile apps into one app and reduces the need to switch back and forth between apps to accomplish your tasks.
Where you can get the Office Mobile App:
If you want to learn more about the new mobile Office app, check out this Microsoft article that dives deep into everything it can do.