Microsoft drew a line in the sand on Tuesday, as its Office 365 chief said that editing and viewing documents on small-screen devices would continue to be free — likely killing off the idea of a small-screen Surface Pro mini, incidentally.

Kirk Koenigsbauer, the corporate vice president for the Office 365 Client Apps and Services team, revealed in a blog post that Microsoft believes that 10.1 inches is the dividing line between a “personal” and “professional” experience. Pros need the reliability and security of paid apps, while “personal” users are more interested in free.

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