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Spam levels dropped by about one-third following the recent takedown of the Rustock spambot, according to Symantec's latest Intelligence Report.
With a restraining order in hand, Microsoft is working to take down the spambot, which has infected hundreds of thousands of PCs worldwide.
Advocates for the visually impaired contend that increasingly popular "visual verification" tests are discriminatory, raising a cloud over the future of a widely used antispam tool.