Microsoft CEO Steve Ballmer says the task of trying to stay one step ahead of virus writers and hackers is a never-ending battle.
Speaking at a gathering of U.K. press, Ballmer said Microsoft's "trustworthy computing" effort is far more than just a one-off initiative.
"We will be working on 'trustworthy computing' for the rest of my days at Microsoft, which I hope are many. There are bad people out there in cyberspace, and they are not going to go away. We are going to have to be vigilant. That's going to last for the duration," he said.