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Microsoft Investigates Outage Affecting Teams and Office for the Web

Microsoft Investigates Outage Affecting Teams and Office for the Web

First seen 1 Jun 2026, 16:54 UTC

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ThreatCluster AI
ThreatCluster June 2, 2026 at 16:23 UTC
  • Microsoft is investigating a service outage affecting Teams and Office for the web.
  • Users are unable to access files, encountering error messages about service unavailability.
  • The outage is linked to a recent cache configuration change impacting system performance.

Microsoft is investigating a significant service outage impacting users of Teams and Office for the web, preventing access to files. Affected applications include Excel and PowerPoint, with users receiving error messages indicating that online services are unavailable. The company is analyzing service telemetry to identify the root cause of the issue. This incident follows a recent cache configuration change that caused high CPU and memory utilization, affecting multi-factor authentication setup for some accounts. Microsoft has not disclosed specific regions affected or a timeline for resolution. The situation is ongoing, and further updates are expected as the investigation continues.

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Timeline

2026-06-01
Microsoft announces service outage
Microsoft reported a widespread service incident affecting Teams and Office for the web, preventing file access for users.
Bleepingcomputer
2026-06-01
Error messages reported by users
Affected users are receiving messages stating that online services are unavailable while Microsoft investigates.
Feeds.4Sysops
Recent
Previous incident linked to cache configuration change
A recent cache configuration change caused high CPU and memory utilization, impacting multi-factor authentication setup.
Bleepingcomputer

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