The most radical changes to Longhorn Server include Server Core and the new Internet Information Services 7.0.

Server Core

Longhorn Server Core flips the notion of a Windows server on its head by removing the user interface, the extra services and everything else that makes a Windows server tick and only including the most fundamental core services required for a machine to run Longhorn Server.

Management is done through the command line or through an unattended configuration file. According to Microsoft, "Server Core is designed for use in organizations that either have many servers, some of which need only to perform dedicated tasks but with outstanding stability, or in environments where high security requirements require a minimal attack surface on the server." Accordingly, there are limited roles that core servers can perform. They are:

-- DHCP server