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The Wayback Machine - https://web.archive.org/web/20120216192032/http://www.apple.com/macosx/mountain-lion/

The world’s most advanced desktop operating system moves even further ahead.

See how innovations from iPad inspire new features for the Mac. And find out what’s coming this summer with OS X Mountain Lion. Watch the video

The features you know. Like you've never seen.

Messages, Reminders, Notification Center, Twitter, and more. You love them on iPad. Now you’ll love them on your Mac. And with iCloud, they all work better together. Learn more

Download Messages Beta

Download the free Messages Beta and send unlimited iMessages to iPad, iPhone, iPod touch, or Mac — from your Mac. It’s a taste of what’s coming in OS X Mountain Lion. Download Messages free

Download the Developer Preview

Preview OS X Mountain Lion and discover all the possibilities that await Mac app developers. Learn more