User impact: Users may have been unable to view images in Outlook on the web and Microsoft Teams.

Final status: While we initially received word that impact was persisting after applying the fix, further testing and validation from the affected users still reporting impact confirms that the fix has, in fact, succeeded in remediating the issue.

Scope of impact: Some users serviced by the affected infrastructure that attempt to view images in Outlook on the web may have been impacted.

Start time: Wednesday, March 1, 2023, at 3:00 PM UTC

End time: Monday, March 20, 2023, at 7:00 PM UTC

Root cause: A recent update intended to optimize shared mailboxes and how they work in relation to groups and changes to groups introduced a code issue that was preventing accurate identification of user identities in certain scenarios, which resulted in this impact.

Next steps:

– We’re reviewing this recent update to understand why it introduced a code issue in order to improve our testing and validation cycles to prevent similar impact from reoccurring.

This is the final update for the event.