Microsoft is currently investigating an issue affecting Exchange Online, where some users in Australia are experiencing significant delays in sending and receiving emails.
The problem, first acknowledged on May 22, 2025, has led to disruptions for businesses and individuals relying on Microsoft’s cloud-based email platform.
According to user reports and IT administrators, email traffic has slowed considerably, with some messages taking much longer than usual to reach their destinations.
The situation has sparked discussions in technical forums, with multiple users confirming the delays and noting that the issue appears widespread across Australia.
Microsoft has addressed the incident under the identifier EX1079935 in the Microsoft 365 Admin Center, where administrators can find further updates and technical details. The company has not yet disclosed the specific cause of the disruption, but has assured users that engineers are actively working to resolve the problem.
In the meantime, Microsoft recommends that administrators monitor the service health dashboard for real-time updates and use tools such as message trace to track the status of delayed emails.
This incident follows a series of recent outages and service disruptions affecting Exchange Online users globally. In March 2025, a week-long outage caused similar email delivery failures and delays, which Microsoft attributed to a code issue introduced during a service update.
Although that problem was eventually mitigated, it highlights ongoing challenges in maintaining seamless email services for millions of users worldwide.
Australian businesses, many of which depend on Exchange Online for daily communication, are urged to stay informed through the Microsoft 365 Admin Center and prepare for potential delays in email correspondence.
Users experiencing persistent issues are encouraged to contact their IT support teams or refer to official Microsoft channels for troubleshooting guidance.
Microsoft has not provided an estimated time for complete service restoration, but has committed to keeping affected customers updated as the investigation progresses. Further information and status updates are in the admin center under the incident code EX1079935.
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