Microsoft is offering cash bounties for information on the authors of the crippling MSBlast and Sobig computer bugs.
Microsoft, joined by US and international law-enforcement groups, said it would offer $250,000 apiece for information leading to the arrest of the writers of two of the costliest computer-bug outbreaks to hit the Internet.
The bugs wreaked havoc across the world in August and September, attacking computers that run on Microsoft's Windows operating system.