On a Thursday afternoon in mid-November, a fault spread through Microsoft's cloud infrastructure and reached people across much of the world, from office workers checking their inboxes to patients and staff in hospitals from Ohio to Massachusetts. By Friday morning the reports had fallen from their peak, a sign that the system was healing, yet the company itself confessed that its capacity had not returned to normal and that the recovery was still unfolding in phases. It is the quiet reminder of how much of ordinary life now rests on a few shared servers, and how long it takes to mend a networ
Microsoft Outage Enters Second Day as Outlook Reports Fall but Recovery Remains Incomplete
Major hospitals and hospital networks in the US, including Cleveland Clinic and Massachusetts General, were affected by the outage, and several government agencies were also impacted. No casualties are reported.
The drop is real, but the outage had not ended, and Microsoft said so itself.
Mark
The numbers dropped from 130,000 to under 7,000. Is it basically over?
Mimi
Not quite. Microsoft itself said capacity hasn't returned to baseline, and users may still see delayed email.
Luke
And those counts are Downdetector reports, not users. Microsoft hasn't given a figure for people affected.
Mark
What caused it?
Mimi
Microsoft said servers became unexpectedly unavailable, which put elevated load on the infrastructure that was left. Then a change meant to improve serviceability didn't work as expected.
Luke
That's the company's early explanation. A full root-cause report hasn't come out, so I'd treat it as preliminary.
Mark
The hospital list is long.
Mimi
Eleven named systems, from Cleveland Clinic to Mass General, plus an HHS alert about government agencies.
Luke
Worth noting that's ABC News's reporting, and the source doesn't say what the hospitals actually lost. Impacted is not the same as patient care disrupted. HHS hadn't replied to USA TODAY.
Mark
And the snow day jokes?
Mimi
They show how widely it was felt, though others said it hurt real business.
Le Pouls
- Outlook reports surged to about 130,000 on Thursday before falling to roughly 6,950 by Friday morning, but the drop has not yet meant a return to normal.
- Servers became unexpectedly unavailable, leaving the remaining infrastructure strained under elevated load across multiple regions.
- Hospitals including Cleveland Clinic and Massachusetts General reported disruption, and the HHS issued an urgent alert about affected government agencies.
- Microsoft is working through phased recovery, reporting gains in North America and Europe while warning that delayed email and intermittent failures may persist.
- No full recovery statement or root-cause report has been released, and the total number of affected users remains unknown.
On a Thursday afternoon in mid-November, a fault spread through Microsoft's cloud infrastructure and reached people across much of the world, from office workers checking their inboxes to patients and staff in hospitals from Ohio to Massachusetts. By Friday morning the reports had fallen from their peak, a sign that the system was healing, yet the company itself confessed that its capacity had not returned to normal and that the recovery was still unfolding in phases. It is the quiet reminder of how much of ordinary life now rests on a few shared servers, and how long it takes to mend a network that many people never knew they depended on.
By 9:33 a.m. Eastern on Friday, Downdetector showed 6,950 reports of Outlook problems, down sharply from the 130,000 logged the day before. The relief is real, but the outage that began Thursday afternoon has not ended, and Microsoft said as much in its own updates. Its messages through the morning described uneven progress: broader improvements in North America, sustained gains across much of Europe, and encouraging signs in Asia Pacific, with capacity still short of baseline and delayed email likely for some users.
On Thursday, the company blamed servers that became unexpectedly unavailable, which pushed heavy load onto what was left. Changes intended to improve serviceability did not take effect as planned, and engineers were working to add capacity against sustained traffic imbalances. Reports came from 74 countries and territories, and the real number of affected people is believed to be far larger than the tens of thousands who filed complaints.
The disruption reached well beyond offices. Hospital systems from Cleveland Clinic to Mount Sinai and Massachusetts General reported problems, and the Department of Health and Human Services issued an urgent alert saying several government agencies were affected as well. No casualties have been reported. Online, many workers joked about an unexpected snow day for adults, though others pointed to the real cost to businesses and essential services.
What remains is the wait for two things: a statement that recovery is complete, and a root-cause explanation from Microsoft. Until then, the story is still developing.
By 9:33 a.m. Eastern on Friday, Nov. 13, Downdetector listed 6,950 reports of problems with Outlook, Microsoft's email service. A day earlier the same tracker had logged 130,000. The drop is real, but the outage that began Thursday afternoon had not ended, and Microsoft said so itself.
In a post on X at 5:28 a.m. Eastern on Friday, the company said recovery actions were ongoing across the affected Microsoft 365 infrastructure and moving in phases. It added that capacity had not yet fully returned to baseline. At 8:32 a.m. it described "broader improvements in North America, sustained improvements across much of Europe, and encouraging recovery signals in Asia Pacific." An update at 8:40 a.m. warned that users around the world could still have trouble reaching services and might see delayed email. Earlier Friday, at about 7:11 a.m., Downdetector had shown roughly 11,747 Outlook problem reports.
The outage started Thursday, Nov. 12. Outlook reports peaked near 130,000 at about 1 p.m. Eastern, while Microsoft 365 reports passed 47,000. Downdetector said reports came from 74 countries and territories. Microsoft has not said how many users were affected, and the source notes the real number went well beyond the tens of thousands who filed reports.
On Thursday the company attributed the trouble to "elevated load across multiple regions" after servers became "unexpectedly unavailable," which strained the infrastructure that remained. A status update shortly after 10:30 p.m. Eastern that night said changes meant to improve serviceability had not taken effect "as expected." The company said it was identifying alternate workstreams to add capacity against sustained traffic management imbalances.
On its service page, Microsoft lists OneDrive, Teams, Outlook and Copilot as operational, while cautioning that some users may be unable to access them or complete certain tasks. It said it was seeing improvements in mailbox access and delayed email processing, though intermittent issues might continue. The health page describes "service degradation" across Microsoft 365, including Outlook, Copilot, Lists, Teams, Phone Link, OneDrive, Office for the web, Whiteboard and To-Do. Azure showed no detected issues. Xbox's status page showed everything running, though Vice reported that players had trouble with services such as Xbox Live.
The disruption reached well beyond offices. ABC News reported impacts at Cleveland Clinic, Cincinnati Children's, Kaleida Health and Cayuga in Buffalo, Harris Health System in Texas, Hospital for Special Surgery in New York City, Martha's Vineyard Hospital, Massachusetts General Hospital, Memorial Hermann in Texas, Mount Sinai in New York, Nationwide Children's Hospital in Ohio, and Ohio State University Wexner Medical Center. The Department of Health and Human Services issued an urgent alert saying several government agencies were affected too, per ABC News. USA TODAY asked the department for more information and had not received an immediate reply. No casualties have been reported.
Online, many workers called it a "snow day" for adults. The ice cream brand Cornetto posted a video of someone opening ice cream packs at scenic spots, captioned "This and a Microsoft outage." One user, @nicolasatm, shared a clip of the warning icon over the Outlook app with the caption "& on Nov. 12, all of corporate America fell." Creator Noela Jerome grumbled, "Dear Microsoft, you forgot to switch off Teams." Others said the outage was hurting important services and business.
What to watch now: a statement that recovery is complete, and a root-cause explanation from Microsoft, which has so far not said how many people were affected. USA TODAY has contacted the company, and the story is still developing.
Citations marquantes
Recovery actions are ongoing across affected Microsoft 365 infrastructure and progressing in phases.— Microsoft, post on X, Nov. 13
Envie de l'histoire complète ?
Lire l'original sur Fort Collins Coloradoan ↗