Microsoft said Friday afternoon that a global outage affecting its suite of workplace products, most notably its Outlook email service, was caused by a bug introduced during a network capacity upgrade.

"We have addressed the underlying issue and continue to restore service to remaining customers and regions," Microsoft said in a statement. "Given the scale of demand, we restored services gradually, validating stability at each stage. While this took longer, it helped ensure a stable restoration."

Earlier Friday, the company had already ruled out a hack, but in its latest statement, it definitively said the disruption in service was not caused…

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