When it comes to editing Office documents using an app built by Microsoft, there's still no such thing as a free lunch. Someone who doesn't already have an Office 365 subscription can download Word for iPad for free and view Word documents until the cows come home. But for the privilege of creating or editing one, the App Store needs to ring up $99.99 per year for Office 365 Home purchased from within the app. That license allows the app to be installed and "used on an unlimited number of iPad devices" subject to terms of Office Consumer Subscriptions.
3. $99 Ain't Free