Earlier this week, Apple released the third update to their Lion operating system for the Macintosh.
Mac OS X Lion 10.7.3 is a maintenance release for all Macs running the Lion operating system and Apple recommends installing the update if you are running a prior release of Lion.
You can download the OS update using the Software Update control panel on your Mac, or you can download the update from the Apple website. Mac OS X 10.7 Lion can be purchased from the Mac App Store for $29.99 (requires Mac OS X Snow Leopard 10.6.6 or later to purchase and upgrade).