Microsoft Outlook was down worldwide for four hours

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Microsoft’s Outlook service was down worldwide today, affecting Outlook on the web,, and Outlook on desktop and mobile. The outage started at around 2AM ET, and Microsoft has confirmed it was affecting users worldwide. Outlook users were unable to access their email, and was failing to load for around four hours.

Microsoft says a recent configuration change was to blame for the issues. “We’ve determined that a recent configuration update to components that route user requests was the cause of impact,” says Microsoft in a service message on Twitter. “We’ve reverted the update and are monitoring the service for recovery.”

This is the second major Microsoft services outage in less than a week. On Monday Microsoft Outlook, Office 365, Teams, and other services all experienced issues for hours. Unlike other companies like Cloudflare, Microsoft doesn’t fully detail the root cause of its outages, so we might never know exactly why its Outlook email service has experienced significant issues twice in a week.

Outlook services have started to come back online for most people now, and Microsoft says it has “reverted the update and telemetry shows that the service is now recovering.”

Update October 1st, 6:30AM ET: Microsoft’s Outlook service is now recovering.

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