On a Thursday afternoon, as the working day turned in much of the Americas, people across the region found themselves locked out of the email and collaboration tools that have quietly become the connective tissue of modern work. Microsoft acknowledged the disruption to Exchange Online mailboxes, and its reach seemed to extend beyond any single continent, touching Teams, Copilot and the wider Microsoft 365 suite. The company has not yet named a cause or promised a timetable, so for now the episode stands as a reminder of how much of daily life rests on systems most people never see until they f
Microsoft Outlook Outage Disrupts Thousands in the Americas as Company Investigates Mailbox Access Issues
On a Thursday afternoon, as the working day turned in much of the Americas, people across the region found themselves locked out of the email and collaboration tools that have quietly become the connective tissue of modern work. Microsoft acknowledged the disruption to Exchange Online mailboxes, and its reach seemed to extend beyond any single continent, touching Teams, Copilot and the wider Microsoft 365 suite. The company has not yet named a cause or promised a timetable, so for now the episode stands as a reminder of how much of daily life rests on systems most people never see until they fail.
Just after 1 pm on Thursday, reports began piling up on the outage tracker Downdetector: people could not get into Outlook. By the site's count, around 1.3 lakh users flagged problems with Microsoft's email platform, and the disruption stretched into the early hours of Friday.
The trouble was not confined to email. Thousands of users also reported difficulties with Teams, the workplace messaging app, with Copilot, Microsoft's AI assistant, and with the wider Microsoft 365 suite.
Microsoft acknowledged the problem on X, saying it was investigating trouble reaching Exchange Online mailboxes across multiple connection methods in the Americas. A later update widened the scope, noting the issue might affect Microsoft 365 connectivity for users in any region. The company has not said what caused the outage or when full recovery might come.
There was one partial bright spot: Teams connectivity was restored in North America, though some users still reported problems. For now, the Microsoft 365 admin center, under incident EX1550543, is the place to watch for updates.
Just after 1 pm on Thursday, reports began piling up on the outage tracker Downdetector: people could not get into Outlook. By the site's count, around 1.3 lakh users flagged problems with Microsoft's email platform, and the disruption stretched into the early hours of Friday.
Outlook was not the only service affected. Thousands of users also reported trouble with Teams, Microsoft's workplace messaging app, with Copilot, its AI assistant, and with the wider Microsoft 365 suite. At the time the original report was written, Outlook was still not working.
Microsoft acknowledged the problem in a post on X. The company said it was investigating reports of users having trouble reaching Exchange Online mailboxes through multiple connection methods in the Americas, and pointed customers to the Microsoft 365 admin center, where the incident is logged under the reference EX1550543.
A later update widened the picture. While working to reduce the impact, Microsoft said it had confirmed the issue may affect Microsoft 365 service connectivity for users in any region, not only the Americas. It again directed people to the admin center entry for further information. The source does not say what caused the outage, and Microsoft's posts did not offer a cause or an estimated time for full recovery.
There was one partial piece of good news earlier in the day. Microsoft said it had successfully restored problems related to Teams in North America, though some users continued to report connectivity issues even after that announcement.
The outage landed alongside a separate strand of Microsoft news. According to Bloomberg, the company has begun quietly rolling out its own MAI models, which now handle tens of thousands of AI requests every week in tools including Excel and Outlook, in place of leaning so heavily on outside models from OpenAI and Anthropic. The report ties the shift to cost and control: Microsoft pays by the token for each AI response, and with millions of customers using AI features in Office apps, the bill climbs quickly.
Mustafa Suleyman, Microsoft's AI lead, has already noted that paying for outside AI eats into profits. The move toward in-house models, as described, is meant to hold down those costs and let Microsoft shape the technology to its own needs, even as its partnership with OpenAI remains close. Nothing in the source links this AI shift to the outage.
For now, the place to watch is the Microsoft 365 admin center, where incident EX1550543 will carry mitigation updates. Teams has been reported restored in North America, but Outlook and Exchange Online access were still unresolved when the report was filed.
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