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From http://support.microsoft.com/kb/555924

1. Log on to the Hub Transport Server.
 2. Go to “Start” -> “Programs” -> “Microsoft Exchange Server 2007“.
 3. Open “Exchange Management Shell“.
 4. Write “Install-AntispamAgents.ps1” and press on the “Enter” key.
 5. Restart “Microsoft Exchange Transport” service.
 6. Go to “Start” -> “Programs” -> “Microsoft Exchange Server 2007“.
 7. Open “Exchange Management Console“.
 8. Navigate to “Microsoft Exchange” -> “Organization Configuration” > “Hub Transport“.
 9. A new tab, named “Anti-Spam” should appear.
 
 Note: To revert to Exchange 2007 default settings, use “uninstall-AntispamAgents.ps1
             script and restart the “Microsoft Exchange Transport” service.