Microsoft is struggling to restore its Outlook email service after a global outage disrupted access to its workplace applications across 74 countries and territories.
In an update on X on Friday, Microsoft said its efforts to
stabilise its infrastructure had produced partial recovery in some regions but
had not delivered sustained improvements.
The disruption, which began on November 12, has affected
businesses, government institutions, and schools, leaving users unable to
access emails and other Microsoft 365 services.
We're investigating reports of users experiencing issues accessing Exchange Online mailboxes through multiple connection methods in the Americas. More details can be found in the Microsoft 365 admin center under EX1550543.
— Microsoft 365 Status (@MSFT365Status) November 12, 2026
“We’re continuing our efforts to improve service stability
and traffic flow. This includes adjusting traffic protocols, redistributing
traffic, and applying strategic traffic blocking measures,” the company said.
Microsoft said it is also reviewing additional measures
after the interventions failed to achieve sustained recovery.
“We’re observing partial recovery across regions in which
we’ve applied these adjustments; however, these actions aren’t resulting in
sustained recovery, so we’re reviewing what additional actions we can take to
improve overall infrastructure stability,” the company said.
The technology firm said it is engaged in multiple
workstreams to reduce the impact of the disruption, address its current
technical blocker and restore parts of its service infrastructure to a healthy
state.
Microsoft said it is working to recover its frontend servers
while implementing further traffic optimisation measures to improve service
stability and increase capacity.
The outage affected other Microsoft products, including
Teams, Copilot, and SharePoint.
According to CNN, Downdetector, an outage-monitoring
platform, recorded reports of disruptions across 74 countries and territories
within about an hour, while Outlook complaints peaked to more than 130,000 on
Thursday.
The disruption has also affected businesses and government
operations.
Japanese government employees have resorted to making
physical copies of documents after government services were disrupted, while
the Philippines’ supreme court warned of delays in email responses and other
transactions.
Some businesses and schools in Australia also experienced
disruptions, including difficulties printing invoices and conducting online
classes.
Microsoft said its investigation found that some servers had
become unexpectedly unavailable, shifting traffic to the remaining
infrastructure and overwhelming a core process on affected servers.
The company said it attempted to ease the pressure by
pausing deployments, redirecting traffic and restarting servers.
However, some servers became unresponsive again after
traffic was redirected to them, complicating recovery.
Microsoft said it is not aware of any malicious activity causing the outage and would publish a post-incident report detailing the root cause and corrective measures after the disruption has been mitigated.
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