I have a MBP Early 2011 which came with Lion. I purchased Mountain Lion from the App Store and installed it, and it worked fine for awhile. Recently my machine crapped out and my disk was corrupted pretty bad, and I had to reset to factory settings, so I'm on Lion again.
When I go to the App Store, Mountain Lion is there, but it wants me to pay the 20 bucks again. I originally bought it from the App Store, so I would have thought it would have remembered me, but I guess not.
Is there any way to get it back, short of contacting Apple for support?