$4

Monthly cost per user for Microsoft's upgraded K1 version of Office 365, offered for enterprise workers who aren't bound to desks. The Redmond, Wash.-based software giant has added collaboration and productivity tools to Office 365 Enterprise K1 plans – often called "kiosk plans" – that are used by frontline employees in many industries, from retail to health care and hospitality.

"Giving those [services] to kiosk workers is the right move for Microsoft at this point, given some of the pressures they're getting from Salesforce and Google and some other competitors," said Tony Pagnusat, senior alliance director at Perficient, a Microsoft partner based in St. Louis. While K1 once delivered only a very basic user interface, "with this new set of tools, you get more of a full-fledged information-worker type interface," he said.