"Currently, we are also using screen size to delineate between professional and personal use," Koenigsbauer wrote. "Based on our research, we are classifying anything with a screen size of 10.1 inches or less as a true mobile device: You're probably using it on the go, when it's not practical to use a larger computing device such as a PC or a Mac. You probably aren't using a mouse or a keyboard, instead navigating via touch interface. It's probably not a "pro" category tablet that is used for design or presentations."
Update: Microsoft reached out to inform us that the Office 365 subscription will allow you to create, edit and view documents from your mobile device.
Source:
PCW