Some users were unable to view the contents of address books that contain more than 100 entries in Outlook on the web

Title: Some users were unable to view the contents of address books that contain more than 100 entries in Outlook on the web
User impact: Users were unable to view the contents of address books that contain more than 100 entries in Outlook on the web.
More info: For example, some users may have been unable to see the All Users and the Global Address List (GAL) address books. Affected users saw a “This folder is empty” message. Users may have been able to bypass the issue by searching for contacts or using the Outlook desktop and mobile apps.
Final status: We’ve determined that a recent standard service update inadvertently contained a code regression, which resulted in impact. We’ve reverted the offending change and confirmed that impact has been remediated.
Scope of impact: Impact was specific to some users who were served through the affected infrastructure.
Start time: Sunday, November 5, 2023, at 5:00 PM UTC
End time: Wednesday, November 22, 2023, at 4:30 PM UTC
Root cause: A recent standard service update inadvertently contained a code regression, which resulted in impact.
Next steps:
– We’re reviewing our update procedures to better identify similar issues during our development and testing cycles.
This is the final update for the event.