Sophos NAC only installs on Windows 2003 or 2008 standalone server not SBS

Although the Sophos control panel can install on a Windows XP workstation, NAC will only install on a full Windows 2003 or 2008 server.

It will not install on an SBS server.

The server requires IIS service to be installed in order to run NAC profile management

Further details on instructions are here-