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iOS X Lion's conversation threading in Apple Mail 5
Rounding out the product announcements made at WWDC was the launch of the latest operating system for Macs, known as Lion.
As well as the introduction of full-screen apps, Launchpad - an overview of the apps running on your Mac - and easier server set-up, Lion has gained a conversation thread format similar to Gmail's for Apple Mail 5, shown above.
For a full tour of the OS, see A safari through Apple's Lion OS for Mac.