Exchange Server 2010 Standard Device CALIMPORTANT NOTE: You must buy at least 5 CALS. New orders must also purchase a server licenseThe Standard CAL is designed to help users be more productive from virtually any platform browser or mobile device with new features in Exchange Server 2010 that help manage communications overload and lower helpdesk costs. The Standard CAL works with either server edition.LicensingA 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.