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Microsoft 365
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Past Incidents
Sep 12, 2026
No incidents reported today.
Sep 11, 2026
No incidents reported.
Sep 10, 2026
No incidents reported.
Sep 9, 2026
No incidents reported.
Sep 8, 2026
No incidents reported.
Sep 7, 2026
No incidents reported.
Sep 6, 2026
No incidents reported.
Sep 5, 2026
No incidents reported.
Sep 4, 2026
No incidents reported.
Sep 3, 2026
No incidents reported.
Sep 2, 2026
Resolved -
We will continue to monitor, but will mark as resolved.
Latest from Microsoft…
Users may be unable to connect to, or experience degraded functionality with Exchange Online
ID: EX1464935
Issue type: Incident
Status update... Thu 03/09/2026 21:39...
Service Restored
Impacted services
Exchange Online
Details
Title: Users may be unable to connect to, or experience degraded functionality with Exchange Online
User impact: Users may have been unable to connect to, or experienced degraded functionality with Exchange Online.
More info: We've confirmed that the authentication component issue impacted other services beyond Exchange Online. For more information regarding other impact scenarios, please see: MO1465074.
We've opted to keep this post (EX1464935) open as Exchange Online was the most predominantly impacted service.
Users may have experienced a variety of symptoms related to this event, including but not limited to:
Users couldn't download email message attachments through any Exchange Online connection method.
Delays, failures, or incomplete results when searching for content within Exchange Online mailboxes.
Delays or failures when sending or receiving email messages.
Authentication-related errors when accessing Exchange Online services.
Difficulties accessing or performing actions within Exchange administration experiences.
Intermittent failures affecting mailbox operations and message delivery work.
Delays or failures when sending or receiving email messages via Outlook for iOS and Android.
Users may have been unable to use room finder in Outlook calendars.
Users may have been unable to sign in to Outlook on the web.
Final status: Based on our telemetry all previously impacted services have remained healthy since impact was remediated on Thursday, September 3, 2026, at 10:00 AM UTC, and this issue is resolved.
Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event.
Start time: Monday, August 31, 2026, at 3:08 PM UTC
End time: Thursday, September 3, 2026, at 10:00 AM UTC
Preliminary root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services was resulting in impact.
Next steps:
We’re evaluating our core authentication configurations to prevent the recurrence of similar impact in the future. In addition, we're further reviewing our monitoring systems to ensure we identify and are expediently alerted to these types of scenarios.”
Microsoft will provide a preliminary Post-Incident Report within two business days and a final Post-Incident Report within five business days.
Sep 2, 09:42 BST
Latest from Microsoft…
Users may be unable to connect to, or experience degraded functionality with Exchange Online
ID: EX1464935
Issue type: Incident
Status update... Thu 03/09/2026 21:39...
Service Restored
Impacted services
Exchange Online
Details
Title: Users may be unable to connect to, or experience degraded functionality with Exchange Online
User impact: Users may have been unable to connect to, or experienced degraded functionality with Exchange Online.
More info: We've confirmed that the authentication component issue impacted other services beyond Exchange Online. For more information regarding other impact scenarios, please see: MO1465074.
We've opted to keep this post (EX1464935) open as Exchange Online was the most predominantly impacted service.
Users may have experienced a variety of symptoms related to this event, including but not limited to:
Users couldn't download email message attachments through any Exchange Online connection method.
Delays, failures, or incomplete results when searching for content within Exchange Online mailboxes.
Delays or failures when sending or receiving email messages.
Authentication-related errors when accessing Exchange Online services.
Difficulties accessing or performing actions within Exchange administration experiences.
Intermittent failures affecting mailbox operations and message delivery work.
Delays or failures when sending or receiving email messages via Outlook for iOS and Android.
Users may have been unable to use room finder in Outlook calendars.
Users may have been unable to sign in to Outlook on the web.
Final status: Based on our telemetry all previously impacted services have remained healthy since impact was remediated on Thursday, September 3, 2026, at 10:00 AM UTC, and this issue is resolved.
Scope of impact: Users attempting to perform any of the outlined impact scenarios may be affected by this event.
Start time: Monday, August 31, 2026, at 3:08 PM UTC
End time: Thursday, September 3, 2026, at 10:00 AM UTC
Preliminary root cause: An issue within a core authentication configuration used by multiple Microsoft 365 services was resulting in impact.
Next steps:
We’re evaluating our core authentication configurations to prevent the recurrence of similar impact in the future. In addition, we're further reviewing our monitoring systems to ensure we identify and are expediently alerted to these types of scenarios.”
Microsoft will provide a preliminary Post-Incident Report within two business days and a final Post-Incident Report within five business days.
Sep 2, 09:42 BST
Update -
"Our telemetry indicates service availability remains stable above 99 percent, and we expect the majority of users should no longer be seeing impact from this issue. Our continued focus is on balancing the implementation of our fixes across remaining portions of affected infrastructure to ensure persistent recovery, with added attention on ensuring withstanding recovery of scenarios dependent on REST and Graph API connection methods."
Sep 2, 09:03 BST
Sep 2, 09:03 BST
Monitoring -
According to the latest update from Microsoft - https://x.com/MSFT365Status/status/2094683892871520432 - "Our mitigation actions are continuing to progress within the remaining affected infrastructure. Indications from telemetry remain positive, and we've confirmed service availability is improving. We're entering a period of extended monitoring to ensure a full resolution is achieved."
Sep 2, 07:41 BST
Sep 2, 07:41 BST
Investigating -
We are getting reports of issues searching for emails in Outlook, and other issues. Microsoft have acknowledged it as follows and are working to resolve...
Users may be unable to connect to, or experience degraded functionality with Exchange Online
ID: EX1464935
Issue type: Incident
Status
Service Degradation
Impacted services
Exchange Online
Details
Title: Users may be unable to connect to, or experience degraded functionality with Exchange Online
User impact: Users may be unable to connect to, or experience degraded functionality with Exchange Online.
More info: More info: Users may experience a variety of symptoms related to this event, including but not limited to:
Delays or failures when sending or receiving email messages.
Authentication-related errors when accessing Exchange Online services.
Difficulties accessing or performing actions within Exchange administration experiences.
Intermittent failures affecting mailbox operations and message delivery workflows.
Current status: We're reviewing service telemetry and diagnostic data to isolate the source of the issue after receiving an increase in user-reported issues affecting Exchange Online. We'll keep refining the 'more info' section as additional impacts are identified.
Scope of impact: This issue may impact users attempting to send or receive email messages through Exchange Online. We're continuing our investigation to determine the full scope of affected scenarios and will provide additional information as it becomes available.
Sep 1, 15:28 BST
Users may be unable to connect to, or experience degraded functionality with Exchange Online
ID: EX1464935
Issue type: Incident
Status
Service Degradation
Impacted services
Exchange Online
Details
Title: Users may be unable to connect to, or experience degraded functionality with Exchange Online
User impact: Users may be unable to connect to, or experience degraded functionality with Exchange Online.
More info: More info: Users may experience a variety of symptoms related to this event, including but not limited to:
Delays or failures when sending or receiving email messages.
Authentication-related errors when accessing Exchange Online services.
Difficulties accessing or performing actions within Exchange administration experiences.
Intermittent failures affecting mailbox operations and message delivery workflows.
Current status: We're reviewing service telemetry and diagnostic data to isolate the source of the issue after receiving an increase in user-reported issues affecting Exchange Online. We'll keep refining the 'more info' section as additional impacts are identified.
Scope of impact: This issue may impact users attempting to send or receive email messages through Exchange Online. We're continuing our investigation to determine the full scope of affected scenarios and will provide additional information as it becomes available.
Sep 1, 15:28 BST
Sep 1, 2026
Aug 31, 2026
No incidents reported.
Aug 30, 2026
No incidents reported.
Aug 29, 2026
No incidents reported.