Title: Users may receive a “cannot create folder” message when creating public folders in the Outlook desktop client
User impact: Users may have received a “cannot create folder” message when creating public folders in the Outlook desktop client.
Final status: Following our completed fix deployment, which reverted the update that introduced this problem, our internal service telemetry confirms that impact has been remediated.
Scope of impact: Any user served through the affected infrastructure may have received a message stating “cannot create the folder” when creating public folders in the Outlook desktop client.
Start time: Monday, September 25, 2023, at 6:30 AM UTC
End time: Wednesday, October 18, 2023, at 3:04 PM UTC
Root cause: A recent update, intended to optimize mailbox folder hierarchy syncing, exacerbated a corruption within the process by which primary and secondary mailboxes were synced, leading to impact.
Next steps:
– We’re further analyzing the offending service update along with the introduced corruption so we can help identify similar issues during our testing and validation processes and before impact can be produced.
– We’re assessing the methods we utilize in observing and validating the progress of our deployments implemented over a broad scale of service infrastructure, which we’ll use for identifying methods for more precisely determining and communicating when a service impact ceases.
This is the final update for this event.
