For what earthly reason would Leopard not be pre-installed on this machine? I was surprised when I saw a Leopard "drop in disc", then shocked upon first boot up seeing that Tiger was installed. Well first off on initial boot I had a kernel panic several times. That was a bit unsettling. But a reset of the pram and things seemed to be ok. But back to the Tiger install, my ONLY thought was maybe this mabook was actually a brand new unit that they just repackaged as a reburb since they have been refreshed?? Is this a likely scenario?