Microsoft 365 users in multiple regions experienced connectivity problems on Nov. 12, with reports rising shortly after noon Eastern time. Microsoft initially said it was investigating trouble accessing Exchange Online mailboxes through several connection methods in the Americas, then cautioned that the disruption could affect service connectivity in any region. The scale of reports grew quickly: Downdetector recorded more than 100,000 outage reports around 1:30 p.m. Eastern. The disruption centered on access to online mailboxes, though the update did not specify how many users were affected or detail other services experiencing problems.
Microsoft said it was working to reduce the impact and identified elevated load on part of its infrastructure across multiple regions as a likely contributor to the connection errors. It did not explain what caused the infrastructure load, give an estimated time for service restoration, or confirm that access had returned to normal. The company directed administrators to incident EX1550543 in the Microsoft 365 admin center for further details. The available information therefore describes an active, potentially worldwide service disruption and Microsoft’s initial investigation, rather than a confirmed root cause or resolution.
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