Working from home is threatening businesses security, a cost that is estimated to be around 8.5bn a year.
Network software company Novell warned that homeworkers pose a new threat described as "security teleshirking".
Four out of five homeworkers are ambivalent, according to a Novell survey, rendering them vulnerable to computer viruses and hackers.
According to Novell, the problem is one of awareness. Homeworkers reportedly were more concerned about distractions from the TV, "feeling lonely" and "missing the buzz of the office" rather than exposure to deadly PC viruses in their average day.
Novell UK managing director Steve Brown commented: "The number of people working from home or from a remote office is growing all the time. The benefits of having a more flexible workforce are clear, but...