Some users may be unable to access their user or archive mailbox using the Outlook desktop client or Outlook on the web

Title: Some users may be unable to access their user or archive mailbox using the Outlook desktop client or Outlook on the web
User impact: Users may have been unable to access their user or archive mailbox using Outlook desktop or Outlook on the web clients.
Final status: We’ve confirmed that the fix has completed deployment to all affected infrastructure and validated remediation via service telemetry.
Scope of impact: Impact was specific to some users, who were served through the affected infrastructure, attempting to access their user or archive mailbox using the Outlook desktop client or Outlook on the web.
Start time: Tuesday, October 10, 2023, at 10:00 PM UTC
End time: Friday, October 27, 2023, at 4:30 PM UTC
Root cause: A recent service update, meant to address an unrelated code issue, introduced a conflict that was resulting in impact.
Next steps:
– We’re continuing our review of the code within the impacting update to better identify and correct similar issues during our validation procedures and prevent these issues in the future.
This is the final update for the event.