My new favorite toy... too bad it broke Mozilla.
Ximian GNOME delivers an elegant, complete desktop experience for Linux and UNIX users. Based on the work of the open source GNOME project, Ximian GNOME provides an intuitive graphical interface for first-time setup, system and network configuration, drag and drop file management, Internet browsing, and more.
Ximian Evolution is the premier personal and workgroup information management tool for Linux and UNIX-based systems. Ximian Evolution seamlessly combines powerful email, calendar, address book, and task list management in one fast, easy to use application. The software can be tightly integrated into corporate networks and works alongside messaging systems such as Microsoft Exchange and Lotus Notes. With Ximian Connector installed, Ximian Evolution functions as a Microsoft Exchange 2000 client, for seamless integration with Exchange calendaring and other features.