Microsoft’s Exchange Online Service Experiences Widespread Email Delays and ‘Server Busy’ Errors
A major outage has crippled Microsoft’s Exchange Online service, leaving users unable to send or receive emails from external domains. The issue, which began early yesterday morning, has caused “intermittent Server busy” errors and delays for multiple mailboxes.
The problem appears to be related to anti-spam protections, which are further exacerbating the email issues. Microsoft is still investigating the root cause of the outage but acknowledges that its ongoing email delivery problems may be affecting a significant number of users. The company has not provided a specific timeline for when it expects to resolve the issue.
The Exchange Online service, used by millions worldwide, allows businesses to manage their email and calendar systems in the cloud. Any disruption to this service can have far-reaching consequences, including lost productivity, missed deadlines, and compromised business continuity. Given Microsoft’s history of resolving similar outages in the past, it is likely that the company will work tirelessly to get Exchange Online back up and running as soon as possible.
This incident marks the latest in a string of service disruptions affecting Microsoft 365 customers. Just last week, the company mitigated a massive outage that caused authentication issues, connection problems, and service delays for its users. The frequency and severity of these outages have raised questions about Microsoft’s ability to provide reliable services to its customers.
While the full extent of this outage is still unknown, one thing is clear: it highlights the importance of having robust backup systems in place for email and other critical business functions. In today’s digital landscape, even a few hours of downtime can have significant consequences. As Microsoft continues to work on resolving the issue, businesses should take this opportunity to review their own disaster recovery plans and ensure they are prepared for any future disruptions.
In practical terms, users affected by this outage will need to be patient and wait for Microsoft’s engineers to resolve the issue. However, it’s also a good time for businesses to review their email service providers and consider investing in backup solutions that can minimize downtime in case of an outage. By being prepared and having a plan in place, organizations can mitigate the impact of such disruptions and ensure business continuity even when services are unavailable.
Source: Bleeping Computer — 2026-09-04