THREAT STATISTICS
48% increase in Windows viruses in six months
74% of the top 50 malicious code samples steals confidential information
80% of the top ten adware programs install themselves via browsers
50% of top ten adware programs hijack browsers
61% of all e-mail is spam
51% of all spam originates in the US

http://news.bbc.co.uk/1/hi/technology/4259554.stm

...purely so i can protect my company from malicious US spam... ie all mail from my boss...