The average UK PC is rendered unusable for the equivalent of around nine working days every year because the owner is cleaning up spam or fighting viruses. This is two days a year more than the average UK worker takes off as sick leave, according to Yahoo.

A survey of 2,500 UK e-mail users found that 70 percent of users had been infected by a virus in the past year and 42 percent say they found it less stressful fighting their way through rush-hour traffic than finding legitimate e-mails among the spam in their inboxes.

Spam is a problem for all e-mail users but some companies are hit harder than others.

Vbug, a Microsoft developer support company based in the UK with just six employees, received around 720,000 e-mails messages in a month, 99.84 percent of which were spam.

Graham Parker, Vbug’s chairman, said his employees had to spend more time each day finding the few legitimate e-mails among the mountain of spam.

More here.