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Users may be unable to access their mailbox using multiple Exchange Online connection methods

Exchange Online EX1550211

Users may be unable to access their mailbox using multiple Exchange Online connection methods.

Status
Service degradation
Feature
OWA - problem connecting
Region
Switzerland
Started
Nov 12, 2026, 11:05 CET
Duration
18 h 45 min
Last update
Nov 12, 2026, 18:12 CET
Next update
Nov 12, 2026, 20:30 CET

Current status

We've updated the More info section of this communication to add that users in Mexico may also be affected. analyzing error logs and telemetry to investigate further into the aforementioned unhealthy service infrastructure issue in order to identify a root cause and fully mitigate impact for this event.

More info

Impacted connection methods include, but aren't limited to:

- Exchange ActiveSync (EAS)
- Outlook on the web

Scope of impact

Some users located in Switzerland and Mexico attempting to access their Exchange Online mailbox may be impacted. This section may be updated as our investigation continues.

Timeline

Every update Microsoft posted for this issue, newest first.

  1. Nov 12, 2026, 18:12 CET

    We've updated the More info section of this communication to add that users in Mexico may also be affected. analyzing error logs and telemetry to investigate further into the aforementioned unhealthy service infrastructure issue in order to identify a root cause and fully mitigate impact for this event.

  2. Nov 12, 2026, 16:28 CET

    We’ve identified that the issue is associated with unhealthy service infrastructure. The service is recovering, though recovery isn’t yet complete. We’re investigating what caused the affected infrastructure to become unhealthy.

  3. Nov 12, 2026, 12:47 CET

    We've identified elevated resource utilization on a section of infrastructure responsible for facilitating Exchange Online access. We're reviewing telemetry to identify the source of the resource utilization and assessing available mitigation options to help remediate impact.

  4. Nov 12, 2026, 11:43 CET

    We're reviewing service monitoring telemetry to isolate the root cause and determine our next troubleshooting steps.

  5. Nov 12, 2026, 11:23 CET

    We're investigating a potential issue and checking for impact to your organization. We'll provide an update within 60 minutes.

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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.