Microsoft Services Fully Restored After Global Outage

Microsoft has confirmed that its core cloud applications are fully operational following a worldwide technical failure that disrupted workplace communications across more than 70 countries for roughly 24 hours. The outage affected over 430 million users and impacted numerous external services that connect with Microsoft products. Engineers completed remediation work on the underlying infrastructure fault, bringing Outlook, Teams, SharePoint, and the artificial intelligence assistant Copilot back online.

The disruption began shortly before 1:00 p.m. EST on Thursday, with Microsoft formally acknowledging Exchange Online mailbox failures across the Americas at 17:54 GMT. The company warned that the instability likely spanned its global Microsoft 365 ecosystem. Officials attributed the breakdown to “an issue during an earlier network capacity upgrade,” ruling out cyberattacks and rogue artificial intelligence agents.

Initial diagnostic updates pointed to “elevated load across multiple regions” triggered by a “number of servers being unexpectedly unavailable; straining the remaining infrastructure.” Several machines began failing automated health checks during the configuration shift. By 4:00 p.m. EST on Thursday, engineers reported they had “validated an alternative service health check method” that restored partial server capacity.

The company stated that they were “now applying this change more broadly” and deployed automated recovery tools, noting that they were “also preparing automated recovery systems to continually detect and restart unresponsive servers, to maintain service stability while this change progresses.” Gradual recovery unfolded slowly through Friday, with services beginning to stabilize broadly by Friday afternoon UK time.

At 04:36 GMT, Microsoft noted only a “partial recovery” in select territories. By 10:30 a.m. EST on Friday, officials cited “broader improvements” in North America, “sustained improvements” across Europe, and “encouraging recovery signals” in the Asia-Pacific region. The company emphasized “encouraging recovery progress” as “service availability and email delivery performance [was] improving across a growing portion of affected infrastructure.”

To prevent permanent data loss, Microsoft extended its email delivery timeout window to 48 hours while bringing systems back in controlled stages. A Microsoft spokesperson said, “We are deeply sorry for the disruption this incident has caused our customers and partners. We know the trust they place in our services and take that responsibility extremely seriously.” The company pledged to publish a comprehensive post-incident review once internal assessments conclude.

Meanwhile, Amazon Web Services and Google dismissed concurrent rumors of their own outages. Amazon clarified on X that its platforms were “operating normally” and blamed an “unrelated disruption elsewhere online” for potential confusion. Microsoft's incident highlights the significant impact of cloud service disruptions on global communications and the importance of robust infrastructure and recovery systems.

Key points

• Microsoft's global outage affected over 70 countries and 430 million users.
• The outage was caused by an issue during a network capacity upgrade, not a cyberattack.
• Microsoft has pledged to publish a comprehensive post-incident review.