Mac OS X 10.7.4 Build 11E35 Delta & Combo | 4.91 & 5.62 GB
In an extreme situation, say a Mac is lost or stolen, you can remotely wipe the Mac of all its data and contents with the help of iCloud

New features of the operating system:

Launchpad - Management (folders, desktops) and run your application in the style of iOS
Full-screen applications
Mission Control - unites in a Dashboard and Expose, and becomes the center of the window management applications, desktops and so on.
Gestures & animations - new multitouch gestures
Auto-Save maintaining operational status, even after logging out
Versions - Time Machine for documents - manage document versions in two mouse clicks
Resume - saves the state of your Mac after a reboot, including all applications, websites and documents
Mail 5 - new e-mail client in the style iPad
AirDrop - Instant wireless transmission of documents
Lion Server - server version is now built into Mac OS X Lion
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