Resolved after 8 hours 1 minute, affecting Smart Banners, on May 23, 2026.
Some M365 mailboxes are not protected by Smart Banners. A fix has been deploy and we are monitoring the impact.
Affected components
Smart Banners
Update timeline
- identified May 23, 2026, 09:44 AM UTC
50% of M365 mailboxes are not protected by Smart Banners. A fix is being deployed.
- monitoring May 23, 2026, 02:55 PM UTC
Some M365 mailboxes are not protected by Smart Banners. A fix has been deploy and we are monitoring the impact.
- resolved May 23, 2026, 05:45 PM UTC
This incident has been resolved.
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