(CAL) A license granting access to certain Microsoft server software. User CAL A Core User CAL allows a unique user to access Microsoft server software from many devices such as a work computer, home computer, laptop, Internet kiosk, or personal digital assistant (PDA) without having to acquire CALs for each device. Device CAL A Core Device CAL allows users to access Microsoft server software through a single device. Core CAL A license that allows customers to access Microsoft® Windows Server(tm), Microsoft Exchange Server, Microsoft SharePoint® Portal Server, and Microsoft Systems Management Server through a single device. User Core CAL A Core User CAL allows a unique user to access Microsoft server software from many devices such as a work computer, home computer, laptop, Internet kiosk, or PDA without having to acquire CALs for each device. Device Core CAL A Core CAL based on the number of qualified desktops that access licensed server software. For example, a Core Device CAL allows users to access Microsoft server software through a single device.