I have a MBP (Early 2011) refurb. It shipped with Lion although I was hoping it would have shipped with SL. If I bought a copy of SL from the Apple online store could I install it on my Mac as a downgrade? i think my big concern is that my apps are all updated so they may be new enough that that won't support SL. I have not upgraded to ML so I'm still on Lion. Many people still say that SL is the best OSX Apple has done so far. I had SL on my previous Macbook (black) but when I got my new MBP I transferred everything from my bootable SL backup and wrote over it with a Lion backup. In any event would a downgrade be possible?