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Home/Tech/Microsoft Investigates Outlook.com Sign-In Outage
VERIFIEDBy Xavier Rivera· ·1 min read

Microsoft Investigates Outlook.com Sign-In Outage

Microsoft investigates an Outlook.com outage causing intermittent sign-in failures and mailbox access issues. Thousands of users report problems amid service degradation flagged on Downdetector.

Source:BleepingComputer
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Microsoft Investigates Outlook.com Sign-In Outage
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TL;DRAI · 60 sec read

Microsoft investigates Outlook.com outage causing intermittent sign-in failures, sign-outs, and "too many requests" errors that block mailbox access. Downdetector receives thousands of user reports on login and connection issues. Company probes client sign-in scenarios without revealing root cause, scope, or regions. Incident flags service degradation following last month's Exchange Online and Office.com problems.

Microsoft is investigating an ongoing Outlook.com outage that causes intermittent sign-in failures and prevents customers from accessing mailboxes.

Outage monitoring service Downdetector has received thousands of user reports since the incident began over three hours ago, with most citing login problems and connection issues.

In an update on its service health status page, Microsoft states that affected customers experience sign-outs and "too many requests" errors. "Some users may experience intermittent signin failures, including 'too many requests' errors or unexpected signouts," the company said.
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Microsoft's investigation points to client sign-in scenarios as a possible contributor. The company is validating interactions across service components to identify next steps.

Microsoft has not disclosed the outage's root cause, affected user numbers, or regions. The incident is flagged as "service degradation," indicating noticeable user impact without full service downtime.
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Last month, Microsoft mitigated an Exchange Online outage blocking mailbox and calendar access, and addressed separate Office.com and Microsoft 365 Copilot sign-in issues.

EXPERT TAKE

Expert Take: M365 admins should monitor the service health dashboard closely and test alternative access methods like desktop Outlook during sign-in degradations.

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