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Users may be unable to reply or reply-all to email messages sent to Microsoft 365 groups in Exchange Online

Exchange Online EX1479349

Users may be unable to reply or reply-all to email messages sent to Microsoft 365 groups in Exchange Online.

Status
Eingeschränkt
Funktion
All clients
Region
Nicht angegeben (alle Regionen)
Beginn
09.09.2026, 01:00 Uhr
Dauer
38 Tage 3 Std.
Letztes Update
15.10.2026, 20:50 Uhr
Nächstes Update
19.10.2026, 22:30 Uhr

Aktueller Stand

Our fix remains at 93 percent, as the remaining saturation is expected to take extra time, per process. We're continuing to monitor progress toward completion and confirm that impact is remediated for all users.

Mehr Informationen

As a temporary alternative, impacted users may reply or reply all to email messages through user inboxes.

Betroffen

This issue impacts any user attempting to reply or reply-all to email messages sent to Microsoft 365 groups in Exchange Online. This information may be updated as our investigation continues.

Ursache

A recent change made to the service removed an attribute component from the service process that requires that attribute, leading to impact.

Verlauf

Alle Updates von Microsoft zu dieser Meldung, das neuste zuoberst.

  1. 15.10.2026, 20:50 Uhr

    Our fix remains at 93 percent, as the remaining saturation is expected to take extra time, per process. We're continuing to monitor progress toward completion and confirm that impact is remediated for all users.

  2. 14.10.2026, 21:33 Uhr

    Our fix deployment has completed in the initial deployment rings and has started saturating in affected customers' environments. Our monitoring has validated that our fix has completed approximately 93 percent of the deployment, and we'll provide an updated timeline for it completing once it has become available.

  3. 13.10.2026, 21:17 Uhr

    Our monitoring of the deployment is ongoing as it propagates through earlier deployment rings prior to beginning saturation to affected customers’ environments. We'll provide a projected timeline for remediation based on the rate of progress as one becomes available.

  4. 13.10.2026, 02:30 Uhr

    We're continuing to monitor and track the saturation percentage of the fix deployment to ensure it reaches 100 percent in all affected environments.

  5. 08.10.2026, 02:02 Uhr

    We've validated that the previously identified recent change that removed an attribute component from the service process that requires that attribute, has led to impact. We're continuing to monitor our fix deployment; however, this process is taking longer than anticipated. The current fix saturation is at roughly 90 percent, and we'll provide a timeline of completion once it becomes available.

  6. 07.10.2026, 01:51 Uhr

    We're continuing to monitor the deployment of our fix as it progresses, and we'll aim to provide a timeline of completion by our next scheduled communications.

  7. 06.10.2026, 01:32 Uhr

    Our fix deployment is nearing completion, and most affected users should now be experiencing recovery. We’ll continue monitoring the deployment to ensure it completes and restores service for all affected users.

  8. 06.10.2026, 01:32 Uhr

    Our fix deployment is nearing completion, and most affected users should now be experiencing recovery. We’ll continue monitoring the deployment to ensure it completes and restores service for all affected users.

  9. 29.09.2026, 01:56 Uhr

    We've initialized our fix deployment to the affected environment and anticipate the impact should be fully remediated by our next scheduled update.

  10. 26.09.2026, 02:24 Uhr

    We've completed the validation of our planned fixes and are completing the final stages to prepare them for deployment. We anticipate that users will see progressive relief beginning Monday, September 28, 2026, up to our planned remediation date of Friday, October 2, 2026.

  11. 26.09.2026, 00:33 Uhr

    We're conducting verification and validation testing on our proposed remediation to ensure that it will safely and effectively remediate this issue.

  12. 25.09.2026, 22:57 Uhr

    We've identified a recent code change which we believe may be responsible for this issue and are developing a targeted fix to verify.

  13. 25.09.2026, 18:22 Uhr

    We're reviewing support case details to better understand the impact scenario and determine our next steps.

  14. 25.09.2026, 17:56 Uhr

    We're investigating a potential issue with Exchange Online and checking for impact to your organization. We'll provide an update within 30 minutes.

Wenn Microsoft 365 ausfällt

Den aktuellen Zustand aller Microsoft-365-Dienste zeigt die Live-Übersicht, jede Minute aus Microsoft Graph.

Ob Ihr eigener Tenant betroffen ist, zeigt der Dienststatus im Microsoft 365 Admin Center. Gegen Datenverlust schützt nur ein Backup ausserhalb von Microsoft, gegen ausgesperrte Konten ein geprüfter Notfallzugang. Beides richten wir in festen Sprints ein.

Quelle: Microsoft Graph, Service Communications API. Gezeigt wird die Sicht eines Schweizer Microsoft-365-Tenants: Dienste, die dort nicht lizenziert sind, fehlen, und einzelne Meldungen können Ihren Tenant anders betreffen. Die Region nennt Microsoft nur im Meldungstext. Die Ansicht «Schweiz» zeigt Meldungen für die Schweiz, für Europa allgemein und solche ohne Regionsangabe, nicht aber Meldungen, die nur andere Länder wie Deutschland oder Grossbritannien nennen. Die Meldungstexte veröffentlicht Microsoft auf Englisch. Diese Seite ist kein Angebot von Microsoft.