Some Microsoft Azure customers have had a worrying few days after a problematic account migration caused forecast costs for the cloud service to skyrocket, triggering budget alerts.

An alarmed Register reader got in touch after receiving warnings from Azure's automated systems that they had significantly exceeded their budgets, and a glance at Microsoft's support forums indicates their issue was not isolated.

The problem was that costs had suddenly ramped up. One user, with a budget threshold of £63 ($85), received an automated alert indicating that their spend was forecast to reach £758.71 ($1,027). Another said: "We're actively seeing the same issue, costs have blown up by a crazy amount. No official notice or announcement from Microsoft either, it's appalling."

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