Quote: Currently, Terminal Server client access licenses (CALs) are sold in packs of 5 or 20. If you want a certain number of CALs that is not divisible by either pack quantity, you must purchase the next larger quantity that is available. For example, if you want 6 CALs, you must purchase 10 CALs. A hotfix is available to resolve this issue. This hotfix provides single CALs support for Terminal Server license servers that are running Windows Server 2008. With single CALs, you can buy as many CALs as required, and then you can install them on your license servers. http://support.microsoft.com/kb/971302