Dear All i want to buy 2008 windows server std edition with exchange 2010 can any body tell me if i purchase 10 cals for each products on time of purchase so if i want to add more licenses in future like add more 10 cals for each product then there is a facility in windows to add more licenses if not then how i can add licenses thanks Ali

Hi Ali, You do not install them. You ensure you have them to hand for licensing purposes thats it. Please visit below thread for same question. http://social.technet.microsoft.com/Forums/en-US/exchange2010/thread/6953784a-cf64-44f8-a7a1-0a81d08b8e0b/ On-Premise Licensing for Exchange Server 2010: http://www.microsoft.com/exchange/2010/en/us/licensing.aspxAnil