Archive · 23 Jan 2026
Microsoft 365 Global Outage
Microsoft 365, which includes tools like Outlook and Word, had a big problem on Thursday.
Many people around the world, especially in North America, couldn't use these tools.
More than 14,000 people reported issues.
Microsoft said part of their system in North America wasn't working right.
They are trying to fix it.
Some people saw the error message '451 4.3.2 Temporary server error' when they tried to send emails.
Microsoft is working to make things better, but some people still had problems.
This shows how important these tools are for work and school.
Microsoft 365 experienced a global outage on Thursday, affecting services like Outlook, Microsoft Store, and Microsoft Defender.
Over 14,000 issues reported globally, with more than 11,000 complaints related to Outlook alone.
Microsoft identified infrastructure problems in North America as the cause of the outage.
Users encountered the error message '451 4.3.2 Temporary server error' when trying to send or receive emails.
Microsoft is working to restore services, with gradual improvements reported in some regions.
- Who
- Microsoft 365 users globally, primarily in North America
- What
- Service outage affecting multiple Microsoft 365 services, including Outlook, Microsoft Store, and Microsoft Defender
- When
- Thursday
- Where
- Global, with infrastructure issues in North America
- Why
- A portion of service infrastructure in North America not processing traffic as expected
- Service
- Microsoft 365
- Date
- Thursday
- Reported Issues
- 14,000+
- Affected Region
- Global (primarily North America)
- Source
- Downdetector.com
- Error Message
- 451 4.3.2 Temporary server error
