Exchange Server is software that runs on servers, enabling you to send and receive electronic mail and other forms of interactive communication through computer networks. Designed to interoperate with a software client application such as Microsoft Outlook, it interoperates with Outlook Express and other email client applications as well.
SharePoint Services 3.0 lets you compare notes, share schedules and work together on any type of file – anywhere, anytime and on any web browser. The service also makes it easy to launch and maintain intranets, web sites, bulletin boards and picture libraries. It also improves project management with shared calendars and issue tracking capabilities.