Some users may be unable to search mailbox or Address Book content in Exchange Online across connection methods
ID: EX1478033
Issue type: Incident
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Impacted services
Exchange Online
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Details
Title: Some users may be unable to search mailbox or Address Book content in Exchange Online across connection methods
User impact: Users may have been unable to search mailbox or Address Book content in Exchange Online across connection methods.
Final status: We've completed deployment of our fix to resolve the authentication issue and validated with a subset of affected users that our fix successfully remediated impact.
Scope of impact: Some users attempting to search mailbox or Address Book content in Exchange Online across connection methods may have been affected.
Start time: Saturday, September 19, 2026, at 3:00 AM UTC
End time: Wednesday, September 30, 2026, at 4:00 PM UTC
Root cause: An authentication issue was preventing users from searching mailbox or Address Book content in Exchange Online.
Next steps:
- We're isolating how the authentication issue was introduced into our service to validate what additional actions we can take to ensure similar impact scenarios don't occur in the future.
This is the final update for the event.
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