Unplanned Outage: Microsoft Exchange Online Restored
Last Updated:
2025-03-25 11:41:19
Event:
2025-03-25 10:37:00
Status:
Closed
Brief Description:
The vendor resolved an incident that may have resulted in delayed and/or replayed messages in Microsoft Exchange Online email and calendar correspondence.
User Impact:
Microsoft Exchange Online customers may see duplicated emails in their inbox
Workaround:
There is no workaround for this issue
Current Status:
resolved
Services Affected:
Email and Calendar
Subsites Affected:
Email for Faculty and Staff
Full Description:
The vendor resolved an incident that may have resulted in delayed and/or replayed messages in Microsoft Exchange Online email and calendar correspondence.
According to Microsoft, some customers may have encountered Non-Delivery Report (NDR) failures when sending or receiving email messages in Exchange Online. Another behavior customers may have experienced was the intermittent receipt of email messages as a plain text message containing winmail.dat attachments. The work-around was resending affected messages.
The vendor's preliminary root cause analysis points to a recent change to their caching logic and they are now examining the process used to test and introduce changes to their caching logic to ensure similar issues are not introduced in future updates.
According to Microsoft, some customers may have encountered Non-Delivery Report (NDR) failures when sending or receiving email messages in Exchange Online. Another behavior customers may have experienced was the intermittent receipt of email messages as a plain text message containing winmail.dat attachments. The work-around was resending affected messages.
The vendor's preliminary root cause analysis points to a recent change to their caching logic and they are now examining the process used to test and introduce changes to their caching logic to ensure similar issues are not introduced in future updates.
CIT TDX ID:
1754101
Timeline of Changes
| Description | Current Status | Date | Time |
|---|---|---|---|
The vendor resolved an incident that may have resulted in delayed and/or replayed messages in Microsoft Exchange Online email and calendar correspondence. According to Microsoft, some customers may have encountered Non-Delivery Report (NDR) failures when sending or receiving email messages in Exchange Online. Another behavior customers may have experienced was the intermittent receipt of email messages as a plain text message containing winmail.dat attachments. The work-around was resending affected messages. The vendor's preliminary root cause analysis points to a recent change to their caching logic and they are now examining the process used to test and introduce changes to their caching logic to ensure similar issues are not introduced in future updates. |
resolved |
2025-03-25 | 11:41:19 |