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Mail (also known as Apple Mail) is the email application included with Mac OS X.
|10.6 (Snow Leopard)||Mail 4||iCal 4|
|10.7 (Lion)||Mail 5||iCal 5|
|10.8 (Mountain Lion)||Mail 6||Calendar|
The combination of Mail with Apple's calendar application and Address Book offers powerful ways to integrate your email, calendar, task lists, and address book, and many options for organizing your email.
You'll find that these three applications can provide most of the functionality of Outlook 2011, Microsoft's Exchange client, but not all.