Microsoft Outlook users hit by login problems at the start of the week were still seeing errors Monday afternoon as the company said it had tied the disruption to a recent configuration change and rolled back the update. Reports began just before 5 a.m. ET, and Microsoft said some people logging into Outlook.com could face intermittent failures, including “too many requests” errors, while others may find themselves unexpectedly signed out.
A Microsoft spokesperson said the company was working to mitigate an issue that may cause some users to experience intermittent Outlook.com sign-in failures on mobile apps. By 2:49 p.m. ET, Microsoft said the rollback had not resolved the Outlook issue, and around 3:36 p.m. ET it said internal logs from reproductions had pointed to a backend configuration change as the likely cause. The company said it had completed the rollback and was closely monitoring the environment to see whether the move worked as intended or whether more steps were needed for full resolution.
Downdetector reports had reached 1,300 concurrent reports in recent hours before leveling out at about 1,000 by 3:47 p.m. ET, with users flagging trouble on the service’s iOS app. The outage comes as Microsoft 365 Status was also dealing with a separate Copilot issue, saying a portion of its North America infrastructure was using a high number of resources and traffic was being rebalanced to fix it.
For now, the Outlook disruption looks less like a brief glitch than a sign of how quickly a backend change can ripple through a widely used service. Microsoft said it was still trying to understand the source of the error messages, leaving users waiting for a fix that, even after a rollback, had not yet fully taken hold.
