According to a CNET article, Symantec has just aquired TurnTide. (TurnTide is a Pennsylvania based company that specializes in filtering out unwanted mail at the router level.)
In May, Symantec acquired BrightMail, a company that sold software to fight spam. Other aquisitions include PowerQuest, On Technoglogy, Safeweb, Nexland, Recourse Technologies,
Riptech, Security Focus, Mountain Wave, AXENT, 20/20 Software, L-3 Network Security, URLabs, Quarterdeck, Binary Research (Ghost).
Is Symantec proliferating your network?