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V3 posted a story that the outages on Outlook and Hotmail services were caused by an overheating datacenter



In a blog post written by vice president of test and service engineering, Arthur de Haan, the firm gave more insight into the cause of the issue.

"On 12 March, in one physical region of one of our datacenters, we performed our regular process of updating the firmware on a core part of our physical plant. This is an update that had been done successfully previously, but failed in this specific instance in an unexpected way," he said.
  Microsoft Outlook and Hotmail outages caused by overheating datacentre