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Microsoft’s service health dashboard identified Exchange Online as the primary point of failure in the outage that started late on November 12, with knock-on effects hitting Outlook email access, Teams scheduling features, SharePoint Online, Copilot data retrieval and Defender security tools. The company said users in the Americas were first affected before the disruption spread to any region, according to sequential updates on its status page. Downdetector data places peak reports above 130,000 for Outlook alone, with complaints registered from at least 74 countries and territories.
A CIO assessment found the outage began at 16:17 UTC on November 12 when users reported inability to reach mailboxes via web, desktop, mobile or API connections, prompting Microsoft to open a broader incident covering multiple Microsoft 365 components. Government agencies in Australia invoked their agreement with the company while Singapore officials and UK pharmacies reported operational interruptions, the assessment noted. OpenAI and Anthropic also flagged integration problems tied to the same underlying infrastructure.
Microsoft executive Charles Lamanna stated there is no indication of malicious or cyber activity, a position repeated in overnight updates from the company’s status portal. The firm initially attributed connectivity errors to elevated load on server infrastructure before revising the explanation to a change that triggered an influx of retry requests routed through affected servers. Recovery actions including traffic rebalancing and targeted restarts have shown early signs of stabilisation yet capacity has not returned to normal levels, according to the latest Microsoft posting.
Al Jazeera reporting placed the disruption at more than 12 hours by early November 13 with Outlook hit hardest as users experienced complete mailbox lockouts and delayed message delivery. Teams meetings and basic messaging continued for some while calendar and scheduling functions remained impaired, the outlet detailed from user accounts and company statements. The incident follows a pattern of prior Microsoft 365 service degradations, including a November 2024 event that required over 24 hours and manual server restarts to resolve, Forbes archives show.
CNN Business coverage documented businesses sending workers home early in the United States, schools cancelling online classes in Australia and local governments shifting to phone contact instead of email. The outage also affected Microsoft’s own staff and integrations used by third-party AI platforms, according to the network’s compilation of impacts. Microsoft 365 serves roughly 430 million paid users worldwide, amplifying the reach of any extended service failure.
TechSpot data indicates more than 10,000 users continued reporting problems even after partial restorations in the Asia-Pacific region, with the company acknowledging that mitigation measures had not delivered anticipated relief in all cases. The Guardian noted that while some Teams chats returned, email functions and Copilot queries dependent on Exchange Online stayed unreliable into the second day. Microsoft said it would continue monitoring telemetry and introduce additional workstreams as required to achieve full stability.
