> I'm new to here. I'm planing to buy EXS24 on ebay. Could anybody tell me > what's the main difference between EXS24MK I and EXS24MKII?? > Can MK I version 1.0 be upgraded to MK II??? What youre buying is the authorisation. If you have logic v5.5 or later you will use EXS v2, and earlier, EXS v1. The auth authorises both. Take care however - not all EXS24 CD's can have their licence transferred to a new owner apparently, and if you use an XSkey, you'll need to do this to get an authorisation to put in the key. Check your local distie for details. ~Pev