From Mithiwiki

Set Up Mail, Shared Address Book, and Calendar on iPhone

This document explains how to set up a mail account, a shared address book, and a calendar on your iPhone. The process mentioned in this document is tested on iPhone3. It may vary slightly according to your handset or mobile network provider.

Set Up an Email Account

(Learn about configuring a mail account on iPhone)

Set Up a Shared Address Book

(Learn about configuring a shared address book on iPhone)

Set Up a Calendar

(Learn about configuring a calendar on iPhone)