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Outlook DOWN: Microsoft launches investigation into 'unexpected increase' of email error messages
April 27, 2026
Posted 3 hours ago by
Struggling to access your Outlook inbox today? You're not alone.Microsoft has launched an investigation into an unexpected increase in errors for those trying to sign in to Outlook. Trying to launch the email app has resulted in error messages and unexpected logouts. Microsoft 365 Business and Enterprise customers seem to be the worst hit, with everyday users able to swerve the trouble.On X, formerly Twitter, the Microsoft 365 Status account — which posts about any issues that impact apps and services included with the Microsoft 365 suite of apps — shared: We've discovered some users may experience intermittent sign‑in failures, including 'too many requests' errors, or unexpected sign‑outs.
We're analysing service telemetry further to identify any potential next steps and mitigation actions.It followed up this post with: Upon reviewing service telemetry further, we've identified an unexpected increase in error rates affecting two separate error scenarios. We suspect this may be contributing to creating impact, and we're conducting additional analysis to confirm this.More follows, please refresh this webpage for the most up-to-date information Our Standards: The GB News Editorial Charter
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