Microsoft has stated they are launching a new Windows App for Apple’s iPhone that will provide Microsoft Office for users that are already subscribed to Office 365. It is the Microsoft Office Mobile suite and will be compatible with the iPhone 4, 4S, and 5 (and iPod Touch 5th generation) and will require at least 6.1 version or higher. It is not currently available for the iPad, but expected to be available by 2014.
Office 365 is cloud based therefore the Microsoft Office Mobile suite is cloud-connected. Users will also be able to access Office files stored on SkyDrive, SkyDrive Pro, and SharePoint from their iPhone devices.
For more detailed information check this article by Network World website – Click Here
And additional information in this article by Yahoo Finance website – Click here