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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

Uprise Partners is actively monitoring Microsoft’s progress and will provide updates as new information is released.

Brian Gagnon

Brian is a seasoned technologist boasting 25 years of expertise in crafting, expanding, and refining business ecosystems. His journey in the tech landscape has seen him at the helm of Global Systems Engineering at HGST/Western Digital, shaping strategies as a global architect at VMware, and founding and steering tech companies towards success.

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