If you're using Exchange Server 2007 in a topology with an Edge Transport server, the anti-spam agents - Connection Filtering, Content Filter, Sender ID, Sender Filter, Recipient Filter, and Protocol Analysis - are installed on the Edge server. You do not need these agents installed on the Hub server(s).

In environments without an Edge server role, these need to be installed manually on the Hub Transport server(s).

To install anti-spam agents on a Hub Transport server, start Exchange Management Shell and change directory to "\Exchange Server\Scripts" (by default C:\Program Files\Microsoft\Exchange Server\Scripts), and run:
./install-antispamagents

After the anti-spam agents are installed, you can see the Anti-spam tab in Organization Configuration - Hub Transport node in Exchange Management Console. (If your console was open during installation, you will need to restart it).