(Resumed) Users may be intermittently unable to access their mailboxes in Exchange Online using any connection method

Microsoft issued an incident report on 8 Jul 2025 (Tue)

Users Affected Any user who attempts to access the Outlook
Start Time 8 Jul 2025 (Tue) 8:36 AM
End Time 20 Jul 2025 (Sun) 8:00 AM
User Impact Users may be intermittently unable to access their mailboxes in Exchange Online using any connection method.
Incident Details Final status:
After Microsoft monitoring their service health telemetry, they have confirmed that rebalancing request traffic remediated the impact.
Status Restored

Last update by Microsoft: 23 Jul 2025 (Wed) 2:24 AM