Have a customer with an SBS 2003 machine the AD shows 33 users and 25 devices. At the moment they only have 10 cals applied to users. What do I have to purchase to make them legal again? Can I buy 15 cals and apply them to the devices in addition to the 10 user cals we already have or do I have to keep using the cals in user mode and buy another 25 to make it up to 33. Also can I buy OEM cals or does it have to be the volume license ones now.