Microsoft 365 Alert – Service Degradation – Exchange Online – Some users may be unable to add public folders to favorites in Outlook on the web – RESOLVED

10/10/2023 08:38:00 AM (GMT)

NHSMail Reference: INC38778056

Microsoft Reference: EX680139

Issue Status: RESOLVED

Issue Description: Users may be unable to add public folders to favorites in Outlook on the web.

More info: Impacted users have the option to click ”Add Public folder to Favorite”, but nothing happens when they try to perform the action.

Additionally, users that have access to the Outlook desktop client can use this as an alternative method of adding public folders to favorites.

Final Update: 30/10/2023 07:54:00 AM – Microsoft completed deploying the fix to the impacted environments and confirmed with internal monitoring that the issue is resolved, and the impact is remediated. 

Scope of impact: Some users attempting to add public folders to favorites in Outlook on the web may be impacted.

Root cause: A recent service update to Outlook on the web introduced a compatibility issue that’s preventing users from adding public folders as expected.

Next steps: Microsoft are further reviewing the service update to understand how the compatibility issue was introduced, and to understand what prevented it from being detected in their update testing and validation procedures, which will allow them to prevent similar issues in future updates.