Lion is available today in Mac App Store for $29 with over 250 new features including multi-touch gestures, Mission Control, LaunchPad, full-screen apps and a redesigned Mail app.

A handful of Mac users have reported problems upgrading their system to Mac OS X 10.7 Lion, with various error messages, problems and quirks stemming from the Mac App ...

When OS X Mountain Lion was released, it was also made available through the Mac App Store and Apple Online Store.

Apple® today gave a sneak peek of Mac OS® X Lion, the eighth major release of the world's most advanced operating system. Shipping next summer, Lion is inspired by many of iPad's software innovations.