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Microsoft Outlook and other Microsoft 365 services experienced widespread disruptions on Thursday, November 12. Thousands of users reported problems accessing their accounts and online tools.
The outage affected people trying to connect to Exchange Online mailboxes. Reports also pointed to problems with several Microsoft 365 services. This raised concerns for people who depend on the platform for work and communication.
According to Downdetector, a website that tracks user-submitted service reports, complaints about Microsoft Outlook began increasing around 1 p.m. ET. Reports reportedly climbed above 100,000 at their peak. Microsoft 365 also recorded more than 15,000 user reports.
Microsoft confirms Outlook and Microsoft 365 issues
Microsoft acknowledged the disruption and said it was investigating reports from users experiencing difficulties accessing Exchange Online mailboxes across the Americas.
The company also warned that the problem could affect access to additional Microsoft 365 services. Its status updates identified potential connectivity disruptions involving Exchange Online, Microsoft Teams, SharePoint Online, Microsoft Copilot 365 and Microsoft Defender XDR.
The company advised that further information about the incident would be available through the Microsoft 365 admin center under incident reference EX1550543.
The disruption appeared to extend beyond Outlook email access. Users relying on Microsoft’s connected workplace tools could also experience difficulties accessing services used for collaboration, document sharing and security.
Microsoft works to restore affected services
Microsoft said it was pursuing several measures to reduce the impact of the disruption.
In an update at 2:12 p.m. ET, the company reported that it was restarting affected servers as part of its efforts to restore service.
However, Microsoft had not provided a confirmed timeline for a complete resolution in the supplied updates. Its status communications indicated that the company was continuing to investigate and work on mitigation.
Microsoft’s own status page also reportedly experienced loading errors during the incident, making it harder for some users to access service information directly.
Microsoft Teams users had reported earlier problems
The Outlook disruption followed another service issue involving Microsoft Teams in North America.
Earlier Thursday, Microsoft said it had successfully restored problems affecting Teams in the region. However, some users continued reporting connectivity difficulties after the company’s restoration update.
The developments highlighted how disruptions involving connected Microsoft services can affect multiple workplace tools at once.
What users should know
People experiencing Outlook or Microsoft 365 problems can check Microsoft’s official service updates through the Microsoft 365 admin center if they have access. They can also monitor the company’s service-status account and Downdetector for additional reports.
Users should avoid assuming that an email or file has been sent successfully when the platform is experiencing connectivity problems. Checking the sent folder or confirming delivery through another communication channel may help prevent missed messages.
For businesses and professionals that rely on Microsoft 365, the incident is also a reminder to maintain alternative communication methods for important work.
Microsoft had not confirmed a complete resolution or provided a definitive restoration time in the updates described in the original report. Users should consult official service communications for the latest information.
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