Outlook Outage Today: Microsoft Confirms Email Problems as More Than 130,000 Reports Hit Downdetector
November 12, 2026 | Technology News, Microsoft 365 and Email Service Updates
This is a developing story, based on reporting available as of about 2:09 p.m. ET. Service status and report numbers may have changed since publication.
Microsoft Outlook experienced a major service disruption on Thursday, November 12, 2026, leaving large numbers of users unable to access their email and prompting a surge in searches for "Outlook outage," "Microsoft down" and "is Outlook down right now?"
Microsoft confirmed it was investigating problems affecting Exchange Online mailboxes across the Americas. The incident, identified as EX1550543, has affected users attempting to access work and organizational email through multiple connection methods.
According to Reuters' November 12 report, Downdetector recorded more than 130,000 reports involving Outlook at approximately 1:27 p.m. Eastern Time.
The disruption also generated reports involving Microsoft 365 and Teams, raising concerns among businesses that rely on Microsoft's cloud-based productivity services.
Is Outlook Down Right Now?
Microsoft has acknowledged a significant Exchange Online service disruption affecting users in the Americas.
In a public statement reported by NBC Chicago, Microsoft confirmed that it was investigating problems accessing Exchange Online mailboxes through several connection methods.
That means the problem is not necessarily limited to the Outlook desktop application. Users may encounter issues through web browsers, mobile apps and other email clients connected to Exchange Online.
| Outlook outage | November 12, 2026 |
|---|---|
| Outlook reports | 130,000+ |
| Microsoft 365 reports | 46,000+ |
| Incident reference | EX1550543 |
| Restoration time | Not confirmed |
Downdetector figures reported by Reuters at approximately 1:27 p.m. ET. These are user reports, not counts of unique affected customers.
A status page showing normal operation for one Microsoft product does not necessarily mean Exchange Online has fully recovered.
Microsoft 365 Outage: What Services Are Affected?
The most clearly confirmed problem involves Exchange Online, Microsoft's cloud-hosted email infrastructure used by many business and school accounts.
Users have reported difficulty opening mailboxes, connecting to Outlook and accessing email.
Reuters also recorded approximately 3,000 Downdetector reports involving Microsoft Teams.
However, Microsoft said an earlier Teams disruption affecting North American users had already been resolved. It has not been established that the Teams reports and the current Exchange Online disruption share the same underlying cause.
There is also no evidence so far that every Microsoft service, including Word, Excel, OneDrive and Copilot, is unavailable. This is a widespread Outlook outage, not a complete Microsoft 365 shutdown.
What Is Causing the Microsoft Outlook Outage?
Microsoft is investigating the cause of the disruption.
According to MySA's November 12 coverage, Microsoft identified connectivity failures affecting infrastructure responsible for processing mailbox access requests.
Separately, UOL reported that engineering teams were redirecting traffic toward supporting infrastructure as part of their mitigation efforts.
These details point to an infrastructure-related disruption. However, a definitive root cause for incident EX1550543 has not been publicly established.
There is also no verified evidence that today's outage resulted from a cyberattack.
Is This a Nationwide or Global Microsoft Outage?
Microsoft's earliest statements identified users in the Americas as the affected population.
Later reporting indicated that Microsoft warned about possible connectivity problems in other regions.
That raises the possibility of a broader international impact, but it does not confirm that every country, business or Microsoft customer experienced an outage.
The large volume of Downdetector reports shows widespread user difficulties, although those figures represent submissions rather than the number of unique customers affected.
Reports have come from multiple U.S. locations, including Chicago, New York and Texas.
What Is Microsoft Incident EX1550543?
EX1550543 is the official Microsoft 365 incident number associated with the November 12 Exchange Online mailbox access problems.
The identifier helps administrators locate Microsoft's detailed service communications.
Microsoft directs customers to the Microsoft 365 admin center for updates about the investigation, affected services and recovery efforts.
Business administrators can follow the incident using these resources:
Microsoft's service health documentation explains how authorized administrators can check incidents affecting their organizations.
What Should You Do If Outlook Is Not Working?
If you cannot access Outlook email, first determine whether the problem is related to the Microsoft outage or to your own device.
Try accessing your mailbox through Outlook on the web, if available. However, because this incident affects multiple connection methods, switching between desktop and browser access may not solve the problem.
Avoid repeatedly changing passwords, reinstalling Outlook or deleting email profiles while Microsoft is investigating a confirmed service disruption. These steps can create additional problems without fixing a server-side issue.
For business-critical communications, organizations can use previously approved alternative channels, such as phone calls or other messaging services.
Never enter your Microsoft credentials into unfamiliar websites claiming to offer an outage fix.
When Will Outlook Be Back Up?
Microsoft had not provided a confirmed restoration time as of about 2:09 p.m. Eastern on November 12.
Engineering teams were investigating the incident and taking steps to mitigate the disruption.
How long it lasts will depend on the underlying cause, how well the mitigation measures work and whether additional infrastructure is affected.
Users should check the Microsoft 365 admin center for the latest recovery information rather than relying on unofficial restoration estimates.
Why the Outlook Outage Matters for Businesses
Microsoft Outlook and Exchange Online support essential communications for businesses, schools and government organizations.
A disruption can interfere with customer inquiries, appointment scheduling, document approvals and time-sensitive correspondence.
For organizations that depend on Microsoft 365, today's incident is a reminder of the value of business continuity planning.
Companies may benefit from having alternative communication procedures, clearly defined escalation contacts and internal guidance for handling cloud-service outages.
It also shows why organizations should monitor both Microsoft's service-health communications and independent outage reports.
Microsoft Investigates Major Outlook Outage
The November 12, 2026 Microsoft Outlook outage has disrupted access to Exchange Online mailboxes and triggered widespread reports involving Microsoft 365.
With more than 130,000 Outlook problem reports recorded by Downdetector at 1:27 p.m. ET, the disruption is a significant interruption for affected users.
Microsoft has acknowledged the issue under incident EX1550543 and is investigating the cause while working to mitigate it.
The outage is confirmed, but its full geographic scope, root cause and restoration time remain unclear. Users should follow official Microsoft updates and avoid unnecessary account changes while service is being restored.