To install the new Anti Spam filtering software on Exchange 2007 please please follow the following.
Open Exchange PowerShell from the start menu.
Navigate to “Programs FilesMicrosoftExchange serverScripts folder
Type the following command:
./install-AntispamAgents.ps1
restart the Microsoft Exchange Transport service
Open the Exchange Management Console, and on the Organization configuration list, select Hub Transport. The “Anti-Spam” tab has been added to the Hub Transport properties.