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Service Notice: Microsoft Exchange Online Outage (July 16, 2025)
Microsoft is investigating widespread issues with Exchange Online, affecting mailbox access through all methods — including Outlook desktop, mobile, and web clients.
Service Notice: Microsoft Exchange Online Outage
Date: July 16, 2025
Incident IDs: EX1112414, EX1116357
What’s Happening
Microsoft is investigating widespread issues with Exchange Online, affecting mailbox access through all methods — including Outlook desktop, mobile, and web clients.
- Incident EX1112414: Users are unable to access their mailboxes due to issues with connection/authentication across multiple endpoints.
- Incident EX1116357: Newly reported degradation affecting mail delivery delays, including queued outbound email and temporary nondelivery reports (NDRs) for some users.
User Impact
- Inability to open mailboxes, send, or receive email
- Delivery delays and failed message attempts for some organizations
- Outlook may appear stuck on “Trying to connect…” or show a disconnected status
What Microsoft is Doing
- Microsoft is actively deploying fixes across affected infrastructure
- Updates for EX1112414 began rollout July 10 and are nearing most affected regions
- A new engineering response for EX1116357 is in progress, focused on mail transport queuing issues
Estimated Time to Resolution
- Microsoft has not provided a specific ETA, but most regions are seeing gradual improvement for EX1112414
- EX1116357 is under investigation, and mitigation is ongoing
Recommendations for Users
- No user action required unless prompted
- If Outlook is unresponsive, try closing and reopening it or accessing via Outlook on the Web
- For business-critical communication, use alternative platforms (Teams, phone, SMS) until this is resolved
Additional Resources
- Microsoft 365 Service Health Dashboard (For M365 Admins)
- @MSFT365Status on X/Twitter
- Third-party monitoring: IsDown.app
Uprise Partners is actively monitoring Microsoft’s progress and will provide updates as new information is released.
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