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Exchange Online mailboxes unavailable

December 5, 2025 at 5:35 PM UTC

Microsoft

Resolved after 1h 14m December 5, 2025 at 6:49 PM UTC

False Positive | 12:49pm Central - Microsoft reports that after further investigation, the issue was determined to be a false positive. If the issue is occurring, please contact the Technology Services Department. This will be the last update.

Report Received | 11:35am Central - We are investigating a potential issue that might affect the uptime of one of our services. Microsoft reports that users are unable to access their Exchange Online mailbox via any connection method. The Atelic Technology Services Department has not been able to validate this report but are monitoring further updates from Microsoft. End user disruption may occur for this issue.

Last updated: December 12, 2025 at 9:54 PM UTC