Microsoft sees positive results to restart as global outage drags on after 7 hours

Résumé détaillé

Microsoft is expanding corrective measures after a global outage disrupted Outlook and several Microsoft 365 services for over seven hours. The disruption has affected email-linked tools while core Teams messaging, meetings and SharePoint file access remain functional.

Microsoft says it will expand corrective measures to tackle a global outage affecting Outlook and several Microsoft 365 services for over seven hours, as it monitors the stability of changes already applied to affected servers.

In its latest update, Microsoft said it was monitoring the affected servers after implementing temporary traffic restrictions in specific locations.

The company said it would gradually reintroduce additional traffic once it confirmed that the servers remained stable while handling a narrower set of connections. It also said corrective measures would be expanded as stability was established with the changes already applied.

Microsoft's investigation found that a process responsible for establishing secure connections on the affected servers was becoming overwhelmed, causing the servers to stop processing requests.

The company is preparing a configuration change to address the problem across all affected servers. It is first validating the change on a subset of servers before applying it more widely, alongside restarts of the affected infrastructure.

In parallel, Microsoft has begun reverting a recent network configuration change that coincided with the start of the disruption. It is monitoring whether reversing that change contributes to recovery.

The outage has affected several Microsoft 365 services and features that interact with Exchange Online and email services. Microsoft said elements of these services that do not depend on Exchange Online remain functional.

Users may be unable to access their mailboxes through Outlook on the web, Outlook desktop, Exchange ActiveSync or REST-based connections, while email delivery may also be delayed. Some Microsoft 365 admin centre pages may not load, and users may be unable to view recently used files in Microsoft 365 apps.

Microsoft Copilot Chat users may be unable to load the service or receive responses through web and desktop apps.

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