Microsoft Server CALs

Microsoft Server CALs (client access licenses) allow clients to legally and securely access server software. There are three types of CALs:

• User CALs allow a single user to access a server from an unlimited number of devices. It is best for companies with roaming employees who need to access the corporate network from several devices.
• Device CALs allow an unlimited number of users to access a server from a single device. It is best for companies where multiple employees work on one device, such as shift workers.
• Remote Desktop Service (RDS) CALs are required for users or devices that want to utilize Remote Desktop Service functionality on a server. You will need to choose the RDS User CAL or the RDS Device CAL whichever is more suitable for your company.