Friend of mine got 2011 iMac refurb from Apple and it came with 10.8. He was thinking about downgrading to 10.6 because of old big flatbed scanner which is too expensive to replace. Then he called Apple and they said no way it will run 10.6 even though originally these machine were released with 10.6.6 so he returned it w/o even trying! I am not sure if Apple is right in this case. What confuses me is the production date from the serial number - it shows April 2013!? Can't believe, but looks like they still making these discontinued models of 2011 iMacs? and maybe there is a hardware change w/o possibility to downgrade? I wish to know the answer, can anybody help here?