The Bar Method incident
Microsoft 365 – Exchange Online Service Degradation
The Bar Method experienced a major incident on August 31, 2026 affecting Microsoft 365, lasting 1d 22h. The incident has been resolved; the full update timeline is below.
Affected components
Update timeline
- investigating Aug 31, 2026, 05:46 PM UTC
Microsoft is currently investigating a service degradation affecting Microsoft Exchange Online. Impact: Users may experience intermittent issues with Microsoft 365 email services, including: - Delays when sending or receiving email messages. - Failed email delivery or messages not sending as expected. - Intermittent errors when accessing Exchange Online. - Delays affecting mailbox and email delivery functions. Our teams are monitoring the issue with Microsoft and will provide additional updates as more information becomes available.
- monitoring Sep 01, 2026, 06:01 PM UTC
Microsoft has reported continued recovery across impacted Exchange Online services, with core email functionality remaining healthy. Our teams are continuing to monitor the recovery alongside Microsoft while they validate that all remaining impact has been fully addressed. Additional updates will be provided when validation is complete.
- resolved Sep 02, 2026, 04:37 PM UTC
The Exchange Online service degradation has been resolved. M365 services have returned to normal operation. If you continue to experience issues, please submit a support ticket.