The Microsoft Windows Server 2003 family takes the best of Microsoft Windows 2000 Server technology and makes it easier to deploy, manage, and use. The result: A highly productive infrastructure that turns your network into a strategic asset for your organization.

Improvements to Windows 2000
Microsoft Windows Server 2003 includes all the functionality customers need today from a Windows server operating system to do more with less, such as security, reliability, availability, and scalability. In addition, Microsoft has improved and extended the Windows server operating systems to incorporate the benefits of Microsoft® .NET for connecting information, people, systems, and devices.

Server Roles
Microsoft Windows Server 2003 is a multipurpose operating system capable of handling a diverse set of server roles, depending on your needs, in either a centralized or distributed fashion. Some of these server roles include:

File and print server
Web server and Web application services.
Mail server.
Terminal server.
Remote access and virtual private network (VPN) server.
Directory services, Domain Name System (DNS), Dynamic Host Configuration Protocol (DHCP) server, and Windows Internet Naming Service (WINS).