Live status of all services Incident

Some users may experience intermittent errors or failures when accessing Exchange Online through REST APIs

Exchange Online EX1527500

Users may experience intermittent errors or failures when accessing Exchange Online through REST APIs.

Status
Investigating
Feature
Reports of an Incident
Region
Not specified (all regions)
Started
Oct 27, 2026, 16:56 CET
Duration
2 h
Last update
Oct 27, 2026, 18:17 CET
Next update
Oct 27, 2026, 20:30 CET

Current status

We've identified that a recent service change intended to optimize directory functionality may have introduced an issue with how Exchange Online Representational State Transfer (REST) API requests are processed, resulting in intermittent errors or failures. We're testing this theory by disabling the change in a portion of the affected environments and monitoring service telemetry to determine whether this action alleviates impact. If successful, we'll proceed with disabling the change throughout the remaining affected environments to fully remediate impact.

Scope of impact

Impact may occur intermittently for users attempting to access Exchange Online through REST APIs.

Timeline

Every update Microsoft posted for this issue, newest first.

  1. Oct 27, 2026, 18:17 CET

    We've identified that a recent service change intended to optimize directory functionality may have introduced an issue with how Exchange Online Representational State Transfer (REST) API requests are processed, resulting in intermittent errors or failures. We're testing this theory by disabling the change in a portion of the affected environments and monitoring service telemetry to determine whether this action alleviates impact. If successful, we'll proceed with disabling the change throughout the remaining affected environments to fully remediate impact.

  2. Oct 27, 2026, 17:24 CET

    We're continuing to review service telemetry and recent service changes in an effort to isolate the source of this issue and determine an appropriate remediation action.

  3. Oct 27, 2026, 17:06 CET

    We're investigating an issue in which users may experience intermittent errors or failures when accessing Exchange Online through REST APIs. We're reviewing service telemetry to determine the underlying cause and identify the most effective remediation action. We'll provide an update within 30 minutes.

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