Are there any email clients to use with Microsoft Exchange Server?

I'm looking for an email client to use with Microsoft Exchange Server. Right now I'm using Microsoft Outlook but I was wondering if there is any other client with I can use with Exchange server. Thanks :)

Are there any email clients to use with Microsoft Exchange Server?
Microsoft Exchange Server uses a proprietary RPC protocol, of which only the API is documented (see MAPI). It was designed to be used by the Microsoft Outlook client. Email hosted on an Exchange server can be accessed using POP3 and IMAP4, with clients such as Mozilla Thunderbird and Lotus Notes. Both Microsoft Outlook and Novell Evolution are clients capable of using the advanced features of Exchange Server; Microsoft Entourage for Mac also has most of the advanced features implemented in the latest version. Exchange accounts can also be accessed through a web browser, known as Outlook Web Access (OWA). Exchange 2003 also features a WAP version of OWA, called Outlook Mobile Access (OMA).