Widespread Outlook Outage Hits Thousands of Users
On the morning of Thursday, July 10, Microsoft Outlook encountered a major service disruption, preventing users from logging in, accessing mailboxes, and syncing emails across web, mobile, and desktop platforms.
A Rise in Outage Reports: DownDetector recorded a steady increase in user complaints starting around 5 a.m. ET, reaching approximately 2,200 reports by 10 a.m. ET
Affected Features: Login Errors, License Messages, and Sync Failures
The most frequently reported issues include:
- Failure to log in or authenticate
- License validation errors despite valid subscriptions
- Slow loading or complete failure to load inboxes
- Disruptions in email sending and receiving across clients
These problems are consistent across regions, including the United States, the UK, Australia, Canada, and others.
Microsoft Responds with Status Updates and Fix Deployment
Microsoft has publicly acknowledged the outage via its Microsoft 365 Status X (formerly Twitter) account:
- Notified users of configuration changes starting Wednesday night
- Confirmed early fixes were deployed, but had issues
- Stated a corrected patch is now rolling out and being actively monitored
Potential Causes and Historical Context
Although Microsoft has not revealed the root cause, analysts suggest:
- Misconfigured updates
- Authentication infrastructure faults
- Similar disruptions in the past have been linked to faulty modules like “Forms Library”
This isn’t the first outage this year—Microsoft also experienced a major March 2025 service disruption impacting Outlook, Teams, and other Microsoft 365 apps.
When Will Outlook Be Back to Normal?
While no firm timeline has been provided, recovery processes began Wednesday evening and continued through Thursday morning. Microsoft assures users it’s closely monitoring the rollout and restoring service gradually.
Bottom Line
Outlook is experiencing a significant, multi-region outage affecting core email features. Microsoft is actively addressing the issue, and services are expected to return to normal later today. Stay tuned to the official 365 status channel for the latest updates.
