When I opened Microsoft Outlook to check my emails, everything seemed to be okay. messages in my inbox were visible, but they would not open when I clicked on them. I tried sending another email but the result was the same. Then moved to Microsoft Teams because the desktop application was not working. I did not expect Teams to still be available in my browser.
My internet connection seemed to be working just fine, but the Microsoft applications were acting differently. During a major Microsoft 365 outage, I checked the public complaints and Microsoft’s service updates and saw that thousands of people were having similar problems.
What was not working during the outage?
1. Outlook emails wouldn’t open. I could see my inbox on screen, but couldn’t read individual messages. Other users reported that they had Outlook clients that were disconnected, mailboxes they couldn’t access and trouble loading older conversations. Microsoft confirmed that Outlook desktop, Outlook on the web and mobile email connections were among the affected services.
2. Teams desktop not functioning properly: Sometimes Teams acted differently depending on how I accessed it. So when my desktop application went haywire, I could still access the browser. incident notice from Microsoft pointed to failures related to calendars, meeting invites, scheduling and certain contact features. A large number of users were able to continue to use core messaging, calls and meetings.
3. Email transmission and reception was made unreliable: Public complaints included failed outbound emails, delayed deliveries and unexpected email connection failures. Some IT administrators also reported that devices configured to send email, such as office scanners, were not able to do their normal jobs.
4. Microsoft also found other issues with Copilot Chat, Planner, To Do, Microsoft Graph and some SharePoint capabilities that led to disruptions to Copilot and other Microsoft 365 applications. Users might run into errors when trying to access work information or do things that involve Exchange Online.
5. Another difficulty for administrative services was that some Microsoft 365 administrators reported that they were unable to access management pages. Microsoft’s official notice also listed disruptions to security, compliance and device-management capabilities.
How many people in the United States were affected?
issues ramped up around 1 p.m. ET on Thursday, November 12, when Downdetector saw more than 130,000 reports of Outlook problems in the United States. By 9:30 PM ET that number had dipped to just over 25,000, indicating less active complaints, but not confirming that service had been fully restored.
Microsoft 365 and Teams logged thousands more reports, with users in Canada, the United Kingdom, Australia, India, Japan and Singapore also having problems.
downdetector figures are based on problems reported, not unique affected customers. Microsoft has not released a confirmed global total.
What We Learned From Microsoft About Its Servers
Microsoft has identified an issue in the Exchange Online infrastructure that manages user connections. remaining systems had to assume additional workloads due to the sudden unavailability of numerous servers.
Engineers later discovered that a process responsible for creating secure connections was getting overloaded. Microsoft began to bring the affected servers back online, spreading traffic and testing configuration changes that would improve stability.
Americas were the first to experience the impact, and service notices were reporting problems across multiple regions. Microsoft has not provided a breakdown of the server recoveries by country, nor did it identify any specific data centers that were affected.
How much of Microsoft 365 has been recovered?
Microsoft’s most recent incident update available at about 11:12 p.m. ET on Nov. 12 said there is partial recovery confirmed in some affected areas. But the engineers pressed on with their restoration work and these improvements were not sustained evenly.
wider Microsoft 365 outage was ongoing and impacted services related to Exchange Online, but a separate Teams messaging incident that impacted the Americas was resolved by Microsoft in its own right.
No official global recovery percentage or final restoration time. Microsoft’s published health updates still listed service incidents EX1550543 and MO1550821 as active.
In the meantime, what can users do until services are restored?
My experience with Teams is that if one version is not working correctly, it is worth trying to switch to the other version (desktop or browser). However, browser access may not be able to recover features that use the impacted Microsoft servers.
To avoid Outlook sending duplicate emails, it is recommended that you check if a message has already been sent before sending it again. Microsoft is working to restore normal service, but there is an alternate approved method of communication for those awaiting an upmost response.
Administrators can refer to the Microsoft 365 Service Health dashboard for technical updates, instead of making needless changes to otherwise functioning computers.
Are you struggling with the same issues?
I was surprised at how unremarkable the applications looked, even when key features weren’t working. In Outlook my inbox was there but not showing messages. Teams was okay on the browser but not on my desktop.
Did you have something similar? Are your Outlook emails not opening, Teams showing an error message, or are your Microsoft 365 apps back to normal?