Company networks are now more likely to pick up malicious software <A HREF="http://news.zdnet.com/2100-1009_22-6116244.html?tag=nl.r23660">via employee Web surfing than from email attachments,</A> according to a new study. Nearly 40 percent of the 200 Danish companies surveyed said their systems had been infected by a virus or worm, despite the fact that 75 percent had implemented a security policy, IDC Denmark said in its report. But the malicious software in question is no longer primarily making its way through email, as in the past.