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System requirements for Office Mobile
The Office Mobile app requires an iPhone 4 or later (or an iPod Touch Fifth generation), running iOS 6.1 or later. This version of Office Mobile was specifically designed for the small screen sizes of an iPhone; Microsoft declined to comment about its plans for an iPad-specific version. For now at least, the company recommends that iPad users stick with the Office Web Apps.
Office Mobile requires an Office 365 subscription
The new Office Mobile app is free, although that slender price tag comes with a catch: You need an Office 365 subscription to activate the software. (If you don’t have an Office 365 subscription, you can sign up for a free trial on the Web or use the in-app purchase option in the Office Mobile app.) Any Office 365 subscription plan that includes the Office 2013 software will allow you to install and activate Office Mobile on up to five iOS devices.
Connecting Office Mobile to the cloud
The default storage for Office Mobile documents is the cloud. Depending on your Office 365 subscription type and your company's infrastructure, you can connect to a free SkyDrive account, to SkyDrive Pro as part of a business Office 365 account, or to a privately managed SharePoint site.