Before jumping to the most important announcement, Tim Cook started Apple's iPhone 5 launch event with some numbers, especially concerning its new Mountain Lion OS X.
Launched back in July, Mountain Lion is the ninth major release of what Tim Cook and PC Magazine call "the best OS on the planet." According to Tim Cook, Apple managed to sell a total of seven million upgrades making the Mountain Lion one of the fastest-selling version of the OS X.
There has been some word about the next Mountain Lion version and this one might improve the battery life, an issue that has been plaguing MacBook users for some time.
In any case, it looks like Apple is quite happy with the Mountain Lion OS.