You want to use set up a newsgroup feed and populate the Exchange Internet Newsgroups public folder hierarchy.
Open the Exchange System Manager (Exchange System Manager.msc).
In the left pane, expand the appropriate Administrative Groups container and expand the Servers container.
Expand the target server, expand its Protocols object, and the NNTP object.
Double-click the desired NNTP virtual server (usually the default unless you have multiple NNTP virtual servers defined).
Right-click Feeds and select New → Feed to launch the New NNTP Feed Wizard.
Type the FQDN or IP address for the news server Exchange will be sharing newsgroups with (usually your ISP's news server) and click Next.
Select the role that defines the remote server, which will almost always be a Peer server and click Next.
Configure the direction of this feed:
If this feed will receive incoming articles via a pull feed, select the Inbound feed checkbox and select Pull articles from the remote server.
If this feed will receive incoming articles via a push feed, select the Inbound feed checkbox and select Accept a push feed from the remote server.
If this feed will provide outgoing articles to the remote server, select the Outbound feed checkbox.
If you selected an incoming pull feed, select the article date and time from which you wish to begin receiving posted articles; the feed will attempt to receive all posts on the remote ...