In Pictures: Mac OS X's 9 lives

In 21 years, Apple's reinvented Mac OS has pushed computing in vibrant new directions. Now a new version is imminent

OS X Mountain Lion (10.8)

Reign: July 2012-

Key new capabilities: iCloud Documents, Notification Center, iMessage protocol for instant messaging, social networking share capabilities, AirPlay screen mirroring, Gatekeeper application security, enhanced Chinese language and services integration, automatic update installation, document renaming in title bars, and discontinuation of built-in RSS support

Notes: This is the first version of OS X to formally lose "Mac" in its name, and the first to debut since Steve Jobs' death.

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