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Microsoft Suffers 16-Hour Hotmail, Outlook Cloud Outage

Microsoft apologized to users for a cloud service outage that took down its Hotmail, Outlook.com and SkyDrive services for some users for about 16 hours. Microsoft blamed the outage on a firmware update that went awry, resulting in a temperature spike.

This failure resulted in a rapid and substantial temperature spike in the data center that caused Microsoft's safety measures to kick in, blocking access to mailboxes and disabling failover, Arthur de Haan, vice president of test and service engineering in Microsoft's Windows Services unit, said in a blog post.