When Apple expanded the iPad Pro’s screen from 9.7-in. to 10.5-in., it simultaneously shrunk the pool of those who can run Microsoft’s Office apps free of charge.
Like the 12.9-in. iPad Pro introduced in late 2015, the resized iPad Pro gets dumped into the iOS Office apps’ pay-to-use bucket.
Microsoft relies on screen size to separate what it considers consumer-grade tablets from those it believes are business-suitable, with the line drawn at 10.1 inches. Owners of iOS devices with screens equal to or smaller than 10.1-in. are allowed to run the Office apps — Excel, OneNote, Outlook, PowerPoint and Word — for free as long as the resulting work is for “non-commercial purposes.”