Exchange Server 2013 Standard Device CAL
IMPORTANT NOTE: You must buy at least 5 CALS. New orders must also purchase a server license
The Standard CAL is designed to help users be more productive from virtually any platform browser or mobile device. The Standard CAL works with either server edition.
A Device CAL permits one device (used by any user) to access or use Exchange Server. Device CALs are likely to be more cost-effective than User CALs if there are multiple users per device (for example a call center or an airport kiosk). A minimum of 5 CALs and a server license is required.