GoKawiilMicrosoft Exchange Online outage disrupts Outlook email for hours
Microsoft confirmed a widespread outage of Exchange Online on Monday, causing Outlook users to experience delayed or failed emails, authentication errors, and search failures. The company traced the problem to an authentication component and began testing a fix on part of its infrastructure before a broader rollout. Downdetector logged over 5,000 user reports by 2 PM ET, with complaints also flooding social media.
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The incident underscores how dependent businesses remain on centralized cloud services like Exchange Online for daily communication, meaning a single authentication glitch can stall email and calendar access company-wide. Repeated outages like this raise questions about the resilience of Microsoft's cloud infrastructure and the risks organizations take by relying on one vendor for critical operations.
- Microsoft identified an authentication component as the root cause of the Exchange Online outage.
- Over 5,000 user reports were logged on Downdetector as the outage stretched for hours.
- Microsoft is testing a fix on part of its infrastructure before deploying it broadly.
Microsoft 365 Personal Subscription — If Outlook is central to your workday, Microsoft 365 Personal keeps the desktop Outlook app, Word, Excel and OneDrive storage on your machine instead of relying purely on the browser. Locally cached mail means you can keep reading and drafting even when Exchange Online has a wobble.
See Microsoft 365 Personal Subscription on Amazon → Affiliate link — we may earn a commission on purchases, at no extra cost to you. Product picked by AI based on this article; it is not a tested recommendation.Source: techcrunch.com — Sarah Perez, 2026-08-31
Published there as: “Microsoft tests fix for latest hours-long Outlook outage”
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