A massive global outage of Microsoft’s cloud-based services has affected millions of users’ access to workplace applications (Outlook, Microsoft Teams, Microsoft 365 and Copilot) as well as emails, messages, work information retrieval etc.
The widespread outage which started on Thursday November 12 has caused people in several countries to struggle with accessing email, sending messages, retrieving work information and using other productivity tools. Microsoft said it was aware of the incident and working to get things back to normal after “unexpected server failures across our infrastructure”.
Several services within Microsoft’s ecosystem were impacted Outlook users couldn’t get into their inboxes, load emails or connect to their mailboxes; Microsoft Teams users had problems with some communication and collaboration features; Microsoft 365 Copilot users couldn’t load the AI assistant or get responses.
Other affected services included Exchange Online, SharePoint Online, Microsoft Defender XDR, Planner, To Do and Power BI. Businesses, schools and professionals who rely on Microsoft cloud-based platforms for daily operations were concerned about the outage.
Downdetector, the outage-monitoring site, saw reports of problems skyrocket as users everywhere began to experience service disruption. Reports for Outlook reportedly peaked at about 138,058 around 1 pm Eastern Time Thursday; thousands more complaints were logged for Microsoft Teams and other services from Microsoft.
Problems reported included failed logins and inaccessible email accounts, delayed message delivery, access to workplace applications unavailable etc. Organizations using Microsoft 365 for internal communication, scheduling meetings, managing documents and coordinating business activities also got caught in the crossfire.
Microsoft said the problem was due to heavy load on infrastructure in multiple regions, but later confirmed that wasn’t what happened: “loads weren’t unusually high because of traffic spikes a number of servers unexpectedly went down and put more load on the remaining infrastructure which made it harder for us to keep connections stable and handle requests from users.” In an update shared during the incident Microsoft said it was investigating why the servers had gone down and was working to safely bring them back online.
Microsoft paused deployments across its infrastructure, redistributed connection traffic and redirected users to alternative routes wherever possible. They also restarted affected servers in an effort to get them back online (though the recovery process was difficult as some servers got overwhelmed when traffic returned to them). Microsoft then found that core process on which secure connections were established on affected servers was overloaded so they started testing configuration changes and restarting selected systems before rolling out recovery measures more broadly.
The outage also affected Microsoft’s own apps but not only that OpenAI and Anthropic said they had problems with their Microsoft 365 connectors (which let their AI services interact with workplace information like emails, calendars and other business data). So some users who depend on these integrations also struggled to access connected Microsoft services. It showed how outages of major cloud infrastructure providers can ripple out to companies and digital services that rely on them for interconnected platforms.
As of Friday morning Nov 13 Microsoft said some servers had been partially recovered (some of the affected servers were returned to service). The company hadn’t confirmed that all services were restored but users could still experience intermittent connectivity issues as applications started reconnecting. Microsoft was monitoring the infrastructure that has been brought back online and taking additional steps to stabilize service.
The widespread outage again shows businesses and individuals how much cloud productivity platforms are relied upon. Corporate email communication, virtual meetings, document management tools, artificial intelligence Microsoft 365 is part of everyday professional operations now. Microsoft is working to get services back up but users and organisations are waiting for things to return to normal. The company apologised for the inconvenience and said it is taking multiple measures “to minimize impact and restore affected services as quickly as possible”.
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