Age old conundrum. Which OS to use with a CF31? Win 7 is less bulky but older. Win 10 is newer but more bulky... Win 7 support won't last much longer. Win 10 still has a good bunch of years left before support is dropped. Not that it mattered with XP pro - most people just kept using it after MS dropped support for it. Some sellers do not supply OS media so how readily available (legally?) is that material for people buying a used CF31? Does Win 7 properly support SSD's and all the other hardware options that can into a CF31? Do all Mk's of CF31 get full and proper support with WIn 7 and 10?