You need the Norton Add-On Pack for that, what you can download from here: http://www.symantec.com/norton/add-on-pack
But if you subscription is still available, I suggest you to download the new 2009 version. The upgrade is free, and 2009 has the antispam feature built-in.
To upgragde go here: http://www.symantec.com/home_homeoffice/support/special/upgrade2007/vista/select_product.jsp
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