A Network File and Application Server
Microsoft Internet Information Server (IIS) is a network file and application server for Microsoft Windows NT Server network operating system. IIS is the base component building an Internet or Intranet server solution on Windows NT Server, Microsoft Windows NT Workstation.
Integrated with Windows NT Server
IIS is fully integrated with Windows NT Server. The tight integration of IIS with Windows NT Server allows the administrator to use the build in security of Windows NT Server and NTFS file system to build powerful, flexible and secure Internet and Intranet sites