The 10 Biggest Cloud Outages Of 2011

8. Yahoo Mail Nothing To Cheer About

Yahoo Mail, the search company's massive cloud-based e-mail service, went down on April 28. Yahoo could not say exactly how many users were impacted when its hugely popular e-mail service was down for several hours, but Yahoo estimated that more than 1 million of Yahoo Mail's more than 250 million users were affected. Yahoo never really said what caused the problem, but said no e-mail data was lost or at risk during the disruption.

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