Microsoft 365 Alert – Service Degradation – Exchange Online – Some users may be unable to access their archive mailbox using the Outlook desktop client or Outlook on the web – RESOLVED

Announcements Sourav Nandi

17/10/2023 17:15:00 PM

NHSmail Reference: INC38938441

Microsoft Reference: EX681787

Issue Status: RESOLVED

Issue Description: Some users may be unable to access their archive mailbox using the Outlook desktop client or Outlook on the web.

More Info: While Microsoft focus on remediation, they’ve suspended mailbox migrations to prevent additional impact. As such, some admins may be unable to migrate Exchange Online user mailboxes until impact is resolved.

Final Update: 30/10/2023 07:51:00 AM – Microsoft confirmed that the fix has completed deployment to all affected infrastructure and validated remediation via service telemetry.

Scope of impact: Impact is specific to some users, who are served through the affected infrastructure, attempting to access their archive mailbox using the Outlook desktop client or Outlook on the web.

Root cause: A recent service update, meant to address an unrelated code issue, introduced a conflict that is resulting in impact.

Next steps: Microsoft are continuing their review of the code within the impacting update to better identify and correct similar issues during the validation procedures and prevent these issues in the future.