not only is Office for the iPad fully functional (even in airplane mode), the subscription to Office 365 actually might be a pretty good deal, depending on your usage. An annual subscription to Office 365 for $100 entitles you to up to five downloads of Office for the Mac (2011) and Office for Windows (2013). These are fully functional and work in offline mode. You are also entitled to five installations of Word, Excel, and PowerPoint for iPad. iPhone, Android, and/or Windows Phone.