For reading and managing your mail and events, use Evolution. Evolution is a groupware program that makes it easy to store, organize and retrieve your personal information.
Evolution seamlessly combines e-mail, a calendar, an address book, and a memo and task list in one easy-to-use application. With its extensive support for communications and data interchange standards, Evolution can work with existing corporate networks and applications, including Microsoft* Exchange.
To start Evolution, open the Activities Overview by pressing Meta and type mail.
The first time you start Evolution, it prompts you with a few questions to set up a mail account and import mail from an old mail client. Then it shows you how many new messages you have and lists upcoming appointments and tasks. The calendar, address book and mail tools are available in the shortcut bar on the left.