The public information store maintains information in the following system folders in the public folder hierarchy in the Administrator window. These folders are used by the system only. Therefore, you should not attempt to modify them.
Article Index Contains a list of all messages in newsgroup public folders that are maintained in the public information store.
NNTP Control Folder Contains all the NEWGROUP and RMGROUP control messages that the Internet News Service has received. Use the Control Messages property page on the NNTP object for the site or server to access these control messages.
Internet Newsgroups Public Folder The default location for Internet newsgroup hierarchies. Microsoft Exchange Server creates an instance of this public folder on each server. The Internet Newsgroups public folder cannot be deleted. However, it can be configured as a hidden public folder. The folder's display name can also be changed, and you can move the folder within the public folder hierarchy.