On a Thursday just after noon, the everyday rhythm of American office life stalled when Outlook email stopped loading for a great many people at once. Microsoft traced the failure to Exchange Online, the service behind the mailboxes, and to servers that failed their own health checks before being restarted. By mid-afternoon the crowd of frustrated users had thinned from its peak, yet the disruption had not fully lifted, a reminder of how much of ordinary work now rests on a few shared machines.
Microsoft Outlook Outage Leaves Office Workers Across US Unable to Access Email
Email that had been loading all morning would not load
Mark
What actually broke on Thursday?
Mimi
Exchange Online mailboxes, the service behind Outlook email. Microsoft said users couldn't reach them through multiple connection methods in the Americas.
Mark
How big was it?
Mimi
Downdetector reports peaked above 130,000 in the afternoon, and almost 60,000 were still reporting problems at 3:30 pm EST.
Luke
Keep in mind those are user-submitted reports. They show the shape of the outage, not a count of affected people.
Mark
And the cause?
Mimi
Microsoft pointed to failed health checks that may originate from a component on the affected servers. Later it said it was restarting servers that had become unresponsive.
Luke
Note the word "may." That's a hypothesis in Microsoft's update, not a confirmed root cause. Nothing yet says why the servers became unresponsive.
Mark
Was it fixed by the end of the day?
Mimi
Not in what we have. The company said it was aggressively pursuing all pathways to reduce impact, which reads as still in progress.
Luke
Right, and the list of affected services was cut off in the source, so I can't tell you what else was touched.
Mark
So what's worth watching?
Mimi
Whether the restarts clear the remaining reports, and what Microsoft says in its fuller findings.
Le Pouls
- Shortly after noon, Outlook went dark across the United States and inboxes that had loaded all morning simply refused to open.
- Reports on Downdetector surged past 130,000 as workers across the country found themselves cut off during the standard workday.
- Microsoft pinned the trouble on failed health checks, then began restarting servers that had gone unresponsive.
- By 3:30 pm EST the complaints had eased to about 60,000, but the outage was still unresolved and the root cause remained unpublished.
On a Thursday just after noon, the everyday rhythm of American office life stalled when Outlook email stopped loading for a great many people at once. Microsoft traced the failure to Exchange Online, the service behind the mailboxes, and to servers that failed their own health checks before being restarted. By mid-afternoon the crowd of frustrated users had thinned from its peak, yet the disruption had not fully lifted, a reminder of how much of ordinary work now rests on a few shared machines.
Shortly after noon on Thursday, Outlook stopped working for a great many people across the United States. Email that had loaded all morning would not load, and through much of the nine-to-five day, office workers found themselves locked out of their inboxes. Some were stranded by the silence, and others, as CNN noted, were quietly enjoying the unexpected break.
Microsoft acknowledged the problem on X that afternoon, saying it was looking into trouble reaching Exchange Online mailboxes through several connection methods across the Americas. Exchange Online is the service behind Outlook, which explained why the failure appeared in so many different ways.
The scale showed up on Downdetector, where complaints peaked above 130,000 earlier in the afternoon. By 3:30 pm EST the number had dropped to nearly 60,000, a sign of progress but not of recovery. Microsoft later described failed health checks on affected servers and said it was restarting them because they had become unresponsive, while stating it was pursuing every available path to reduce the impact.
The next questions are whether those restarts bring the remaining users back and whether Microsoft will explain the root cause in more depth.
Shortly after noon on Thursday, Outlook stopped working for a great many people across the United States. Email that had been loading all morning would not load, and for much of the standard nine-to-five workday, office workers were cut off from their inboxes. CNN noted that some were stranded by it and some were quietly celebrating.
Microsoft acknowledged the problem on X on Thursday afternoon. The company said it was investigating reports of users having trouble reaching Exchange Online mailboxes through multiple connection methods in the Americas. Exchange Online is the service behind Outlook email, which is why the failure showed up in so many different ways of getting at a mailbox.
The scale of the disruption can be seen in the reports logged on Downdetector, a site that tracks user-reported outages. Complaints about Outlook peaked above 130,000 earlier in the afternoon. By 3:30 pm EST the number had fallen, but almost 60,000 users were still reporting problems. The outage appears to have begun shortly after noon, so it ran for hours rather than minutes.
Microsoft offered some explanation as the day went on. In an earlier update, the company said the trouble stemmed from failed health checks, which it said might originate from a specific component on the affected servers that is responsible for processing those checks. Later it reported that it was restarting those servers because they had become unresponsive.
As the outage dragged through the afternoon, the company said it was aggressively pursuing all pathways to reduce the impact. That wording suggests the fix was being worked in several ways at once and that service had not been fully restored. The source also says Microsoft listed the services potentially affected, but that list was cut off in the material available, so it is not reproduced here.
The Downdetector figures are user reports rather than a precise count of people affected, and the drop from 130,000 to about 60,000 shows improvement but not a resolution. The next things to watch are whether Microsoft's restarts bring the remaining users back, and whether the company publishes a fuller account of the root cause beyond the failed health checks and unresponsive servers it has described so far.
Citations marquantes
We're investigating reports of users experiencing issues accessing Exchange Online mailboxes through multiple connection methods in the Americas.— Microsoft, post on X
Microsoft said it is aggressively pursuing all pathways to reduce impact.— Microsoft (paraphrased)
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