This product comes pre-bundled with the server license and 5 CALs. If you need additional CALs you may order them seperately. Exchange Server 2010 Standard
can help you achieve better business outcomes while controlling the costs of deployment administration and compliance. Exchange delivers the widest range of deployment options integrated information leakage protection and advanced compliance capabilities that combine to form the best messaging and collaboration solution available. There is a reason Exchange Server is the industry's leading server for e-mail calendaring and unified messaging. The Standard Edition is limited to 5 databases per server.
A Server License is required for each operating system environment running Windows Server 2008. A User/Device CAL is required when a user or device is directly or indirectly accessing a Windows server. Additionally if the user or device is accessing or using the Remote Desktop Services functionality of Windows Server a Remote Desktop Services CAL is also required. This product comes pre-bundled with 5 CALs. You can order additional CALs if needed.