Office Mobile is the official Microsoft Office app for the iPhone. Office Mobile for the iPhone will allow you to view, share and edit your Microsoft Word, Microsoft Excel and Microsoft PowerPoint documents from anywhere.
Although anyone can download the app, you need to have an Office 365 subscription to use this app. Office Mobile subscription costs about $100 a year or $10 per month.
You can download it through iTunes or from app store.
The iPhone app will come with Word, Excel and PowerPoint. Office Mobile app offers easy synchronisation with Microsoft’s online cloud storage service SkyDrive.