On 2026-11-12 Microsoft announced that its Outlook email service was experiencing an outage that prevented users from accessing inboxes, initially reported in the U.S. and the Americas and later expanding to any region. Microsoft said its admin center was unreachable and that some infrastructure was under elevated load, prompting the company to redistribute connection traffic across its worldwide infrastructure. The outage follows a September days‑long Microsoft 365 outage caused by a core authentication configuration issue.
Outlook downtime disrupts communication for millions of enterprise users, potentially delaying business operations and eroding confidence in Microsoft’s cloud reliability. The incident also highlights the risk of single‑point load spikes in Microsoft’s global routing, which could affect other SaaS services that depend on the same infrastructure.