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On-premises users may see inconsistent results when viewing the hybrid free/busy information for Exchange Online users

Exchange Online EX1537187

On-premises users may see inconsistent results when viewing the hybrid free/busy information for Exchange Online users.

Status
Service degradation
Feature
Reports of an Incident
Region
Not specified (all regions)
Started
Nov 3, 2026, 19:06 CET
Duration
5 h 5 min
Last update
Nov 3, 2026, 22:23 CET
Next update
Nov 4, 2026, 03:00 CET

Current status

We're continuing our review of the event trace logs provided by a subset of affected users, as well as recent service changes, to determine the root cause and a strategy that remediates impact.

More info

While we investigate this issue, we recommend adjusting the hybrid default setting from "LimitedDetails" to "AvailabilityOnly" to avoid the impact. Alternatively, disabling the Organization Relationship feature will also avoid the impact.

Scope of impact

On-premises users attempting to view hybrid free/busy information for Exchange Online users may be impacted. This section may be updated as our investigation continues.

Timeline

Every update Microsoft posted for this issue, newest first.

  1. Nov 3, 2026, 22:21 CET

    We're continuing our review of the event trace logs provided by a subset of affected users, as well as recent service changes, to determine the root cause and a strategy that remediates impact.

  2. Nov 3, 2026, 22:21 CET

    We're continuing our review of the event trace logs provided by a subset of affected users, as well as recent service changes, to determine the root cause and a strategy that remediates impact.

  3. Nov 3, 2026, 22:21 CET

    We're continuing our review of the event trace logs provided by a subset of affected users, as well as recent service changes, to determine the root cause and a strategy that remediates impact.

  4. Nov 3, 2026, 19:22 CET

    We're reviewing the event trace logs provided by a subset of affected users, as well as recent service changes, to determine the source of this issue so we can develop steps towards impact remediation.

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The live overview shows the current state of every Microsoft 365 service, refreshed every minute from Microsoft Graph.

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To see whether your own tenant is affected, check Service health in the Microsoft 365 admin center. Only a backup outside Microsoft protects against data loss, and only a tested break-glass account against locked-out admins. We set up both in fixed-scope sprints.

Source: Microsoft Graph, Service Communications API. This is the view of a Swiss Microsoft 365 tenant: services not licensed there are missing, and individual issues may affect your tenant differently. Microsoft names the region only in the issue text. The Switzerland view shows issues for Switzerland, for Europe in general and those without a region, but not issues that only name other countries such as Germany or the UK. This page is not provided by Microsoft.