Total IT - Microsoft Outlook - Sending / Receiving Emails – Incident details

All systems operational

Microsoft Outlook - Sending / Receiving Emails

Resolved
Major outage
Started 5 days agoLasted about 2 hours

Affected

Emails

Major outage from 12:58 PM to 2:38 PM

Updates
  • Resolved
    Resolved
    This incident has been resolved. We have received confirmation from some of our previously affected users that they can now send and receive emails. After referencing this with Microsoft, they have also confirmed that this issue should now be resolved. If you continue to have any issues with this, please do contact us and we will look into this for you as soon as possible.
  • Identified
    Identified

    Users may experience delays sending and receiving email messages

    Issue ID: EX1144276

    Affected services: Exchange Online

    Status: Service degradation

    Issue type: Incident

    Start time: 29 Aug 2025, 11:36 BST - First reported failure to Total IT at 13:58.

    Scope of impact

    Some users who are located in Europe attempting to send or receive Exchange Online email messages may be impacted.

    Root cause

    An increase in internal service-to-service calls resulted in authentication failures, causing email delays and failures

    Current status

    29 Aug 2025, 14:06 BST

    After analyzing diagnostic date we determined that excessive internal service-to-service calls resulted in authentication failures, causing email delays and failures. We’re throttling these calls to mitigate the issue and provide relief.

    Next update by:

    Friday 29 August 2025 at 16:00 BST

  • Investigating
    Investigating

    We are currently investigating this incident.
    This appears to be a global outage on Microsoft 365