Mountain Lion is not compatible with this computer
When will I be able to upgrade my Mac Pro to Mountain Lion:
2 x 3 GHz Quad-Core Intel Xeon, Memory 13gb 667 MHz DR2 FB-DIMM, 64GB free disk (system), 1TB free other disks, computer age mid 2007, Mac OS X Lion 10.7.5.
As of 11/28/12: Mountain Lion is not compatible with this computer.
Mac Pro, Mac OS X (10.7.5), Mountian Lion Upgrade rejected