My UTD OS 10.5 is being shipped by USPS and has an estimated delivery date of Sunday Oct. 18 (do they even deliver on Sundays?) I bought a copy today as well from an Apple store for my brother, who won't be here for another few weeks. I am very anxious to install it now. Would the UTD OS X work on his non-eligable MacBook, or is it pre-configured to my serial?