A massive Microsoft outage that began midday Thursday on the US East Coast has left people around the world without access to Outlook email, Teams meeting tools, and other essential office applications. The outage, caused by a technical issue during a network capacity upgrade, has affected as many as 430 million users at some point. Microsoft has apologized for the disruption, which could end up costing billions in lost productivity.
The outage, which was not caused by a cybersecurity breach, has had far-reaching consequences. In the United States, some companies' frustrated workers went home early on Thursday, while in Australia, businesses couldn't print invoices and some schools couldn't hold online classes on Friday. Local governments and small businesses scrambled to find alternatives to Microsoft, with some alerting constituents to call instead of email.
Microsoft reported that queues of emails waiting to be delivered were significantly reduced and approaching normal levels. The company addressed the underlying issue and restored service to remaining customers and regions, but the process took longer than expected to ensure stability. According to Microsoft, the incident was introduced by an issue during an earlier network capacity upgrade that surfaced following a recent network change.
The disruption has caused a wide range of reactions, from US office workers celebrating the email blackout to small businesses struggling to communicate. Some workers barely missed a beat, connecting with colleagues via Slack, phone, and in-person meetings. However, the outage has also had serious consequences, with an estimated $7 billion in lost productivity, according to Anderson Economic Group.
The outage has affected various sectors, including education and government. In Australia, Friday began with a realization that the Microsoft cloud was unresponsive, taking out live feeds from courts and disrupting schools. The national broadcaster, ABC, reported people missing job interviews due to the outage, as well as supply issues with distribution centers stocking supermarkets.
Microsoft has reported broad recovery and stability across its services, with the company working to restore service to remaining customers and regions. The outage has highlighted the reliance on Microsoft's services and the need for robust backup systems. According to Patrick Anderson, president of Anderson Economic Group, perhaps as many as 26 million users on Thursday and 51 million users on Friday have actually seen their operations disrupted in a way that caused an economic loss.
The incident has sparked concerns about the resilience of global technology infrastructure. Downdetector showed a peak of 130,000 reports about Outlook outages, but that figure likely understated the scope of the problem. As Microsoft continues to recover from the outage, users and businesses are assessing the impact and looking for ways to mitigate similar disruptions in the future.
Key points
- The outage could cost $7 billion in lost productivity.
- 430 million users were reportedly affected at some point.
- The outage was caused by a technical issue during a network capacity upgrade.
