Taming Mountain Lion
For those who have been keeping their Macs up to date with Apple's pantheon of exotic felines, upgrading to Mountain Lion should be fairly straightforward, require less than an hour (not including download time) and cost about $20. But, for Macs still running Leopard, the upgrade might cost ten times that amount and take several days to complete.
Here are some of the pitfalls that might await unsuspecting service technicians as they attempt to move to Mac OS X 10.8, aka Mountain Lion. For machines that already have Mac OS X Lion, skip to slide 3.