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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.