updated 03:12 pm EDT, Fri March 28, 2014
Word only Office app in Grossing category's top 10
Just a day after their release, the Office for iPad apps are already in high positions in the Top Free and Top Grossing charts at the App Store. The top three Free apps are currently Word, Excel, and PowerPoint, in that order; a related Microsoft app, OneNote, is in fourth. Word is #5 on the Top Grossing chart, while Excel is 12th, and PowerPoint is 29th.
The disparity in the Grossing chart is likely attributable to Word's popularity and the way Microsoft's subscription scheme works. Word is the centerpiece of Office and its most popular app, since writing is a more common task than spreadsheets or presentations. A single Office 365 subscription enables editing in all three apps, so most people are presumably paying through Word and simply unlocking Excel and PowerPoint with their logins.
Microsoft's real success is difficult to gauge. Apple is taking a 30 percent cut from in-app subscriptions, but it's entirely possible to pay for a 365 subscription via the web, or simply use one provided by an employer. Amazon is selling one-year 365 Home Premium subscriptions for $67.15, well under the $100 Microsoft normally charges.