Oregon businesses and universities lost access to email and other essential workplace services Thursday as a Microsoft 365 failure interrupted communications worldwide, leaving organizations working through service disruptions and delayed messages into Friday.
The Grants Pass Tribune was among the businesses affected November 12. Across workplaces dependent on Microsoft’s systems, employees encountered inaccessible inboxes, failed connections and interruptions to applications used to communicate and coordinate daily operations.
Microsoft said Friday that it had corrected the underlying technical problem, but restoration remained underway for some customers and regions. Email access was improving, and accumulated messages were moving through the system, though intermittent failures and delivery delays persisted.
The outage centered on Outlook and Exchange Online and extended to functions within Teams, SharePoint, Copilot and other Microsoft 365 services. Its effects varied by customer and application, interrupting some organizations’ communications while leaving portions of their other operations functioning.
Microsoft traced the failure to a technical problem introduced during an earlier network capacity upgrade. A subsequent network change exposed the issue. The company said the disruption was unrelated to a cyberattack or artificial intelligence agents and committed to releasing a fuller account after completing its investigation.
Independent network monitoring detected widespread problems around 9:30 a.m. Pacific Thursday, including failed connections, timeouts and server errors.
Within Oregon, Oregon State University reported disruptions beginning around 10 a.m. Its technology office identified problems with Exchange Online, Outlook, Copilot and other services. By Friday, the university had regained Outlook email service, while other Microsoft 365 applications continued recovering. Users were advised that access could remain intermittent and messages could arrive late.
The number of affected Oregon customers remained unconfirmed. No verified totals were available for Josephine, Jackson, Douglas or Klamath counties.
The worldwide reporting volume reflected the breadth of the failure. Downdetector recorded more than 7.4 million reports of problems, with submissions approaching 20,000 per minute at the peak. Reports came from 74 countries and territories within an hour of the initial surge. Those submissions do not represent a verified count of individual users or businesses.
For affected employers, the interruption reached the communications that keep work moving: requests arriving from customers, information exchanged between employees and schedules coordinated across departments. Organizations could retain access to their core business systems and still face delays because the people operating them could not exchange messages normally.
The disruption also reached customers and members of the public waiting for responses from affected organizations. Businesses, government offices and institutions worked around email failures while Microsoft attempted to stabilize service.
Some large companies moved communications to other channels. European exchange operator Euronext directed listed companies to use the telephone. British insurer Aviva distributed alternative phone numbers for earnings calls and transferred recordings through Bluetooth when email was unavailable.
Government agencies in Japan, Singapore, Greece and Norway reported effects on portions of their operations. In the Pacific Northwest, the Washington State Human Rights Commission announced that its email service had been interrupted by the Microsoft outage.
Elsewhere, the consequences reached court proceedings, public safety communications and access to medication. A trial in Manchester, England, was interrupted. British police experienced problems receiving online crime reports, and pharmacies warned of prescription delays. In Colorado, the Arapahoe County sheriff’s office reported that online bond payments were affected.
Universities faced similar difficulties communicating with students and employees. UT San Antonio warned that users could have trouble opening Outlook or sending and receiving email. Its Friday update reported a gradual return of service, with interruptions and delivery delays continuing for some users.
Recovery proceeded unevenly. Microsoft brought services back in stages, checking stability as it restored capacity. By Friday morning, the company reported improving availability across North America and much of Europe, along with progress in the Asia-Pacific region.
Email queues were declining toward normal levels, allowing delayed communications to move again. Institutional notices advised that messages sent during the disruption were expected to arrive after service returned. Available information did not establish widespread permanent loss of email.
For Oregon organizations regaining access Friday, the return of an inbox did not necessarily mean every Microsoft 365 function had recovered. Oregon State’s update reflected that uneven restoration, with Outlook available again while other applications continued returning to normal.
A complete worldwide restoration had not been confirmed in the latest available updates. Microsoft’s promised post-incident report is expected to detail the failure and recovery, while the final customer count and total business impact remain undetermined.