Although it’s been almost five years since its emergence onto the World Wide Web, an Osama Bin Laden-themed computer virus continues to find its way into e-mail inboxes. Learn more about the Bin Laden Email Virus.

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A reward of $250,000 (£172,000) has been offered by Microsoft to find who is behind the Downadup/Conficker virus.

Since it started circulating in October 2008 the Conficker worm has managed to infect millions of Windows computers.

The software giant is offering the cash reward because it views the Conficker worm as a criminal attack.

“People who write this malware have to be held accountable,” said George Stathakopulos, of Microsoft’s Trustworthy Computing Group.

Read more about the Confiicker Worm.