Mimecast Status

June 18, 2026 4:09PM UTC Investigating - We are aware that some Partner Administrators may be experiencing a login loop when attempting to access the Administration Console. We are currently investigating this issue and will post further updates here as they become available. June 18, 2026 7:37PM UTC Investigating - We are continuing to investigate the service disruption impacting Partner Administrators. Administrators are able to successfully log into the Partner Portal; however, when attempting to access customer Administration Consoles via the Partner Portal, they are being logged out. Our engineering teams remain actively engaged in the investigation. Further updates will be posted here as they become available. June 18, 2026 8:18PM UTC Monitoring - We have taken mitigation steps and believe we have resolved the issue impacting access to the Administration Console via the Partner Portal globally. All services should now be functioning normally. Our Engineering team will continue to closely monitor application availability and performance. We will provide further updates here if necessary. June 18, 2026 9:00PM UTC Resolved - We can confirm that we have resolved the issue of degraded access to the Administration Console via the Partner Portal. All services should now be functioning normally. We appreciate your patience as we worked to resolve this issue.

June 18, 2026 9:51AM UTC Investigating - We are aware that some customers hosted on our UK, DE and ZA grid may be experiencing intermittent issues accessing the Mimecast Administration Console. Our Engineering team is actively investigating the issue and we will provide further updates as they become available. June 18, 2026 11:08AM UTC Identified - We have identified the cause of the intermittent issues affecting customers hosted on our UK, DE, and ZA grids experiencing difficulty accessing the Mimecast Administration Console. Our Engineering team is actively working on implementing a fix and we will provide further updates as they become available. June 18, 2026 11:43AM UTC Monitoring - We have implemented mitigation steps and believe we have resolved the intermittent issues affecting access to the Mimecast Administration Console for customers hosted on our UK, DE, and ZA grids. Our Engineering team is closely monitoring the situation to ensure a full resolution. June 18, 2026 3:03PM UTC Resolved - We can confirm that we have resolved the issue affecting access to the Mimecast Administration Console for customers hosted on our UK, DE, and ZA grids. We appreciate your patience while we resolved this problem.

June 10, 2026 10:34AM UTC Scheduled - We will be performing scheduled maintenance on our AU grid on Friday, 12th June 2026, from 10:00 AM –02:00 PM UTC. During this maintenance window, we do not anticipate any disruption to your service, and all services should continue to operate as normal. However, in the unlikely event of any brief interruption, please be assured that no emails will be lost. Our teams will be working to complete all activity within the scheduled timeframe. Should any updates be required, they will be posted here on the Mimecast Service Status Page. If you have any questions, please contact the Mimecast Support team. June 12, 2026 10:00AM UTC Active - Scheduled maintenance is starting. June 12, 2026 2:00PM UTC Completed - Scheduled maintenance is complete.

June 9, 2026 9:42AM UTC Investigating - We are aware that customers in ZA grid may be experiencing email delivery delays. We are currently investigating the issue and updates will be posted here as they become available. June 9, 2026 9:57AM UTC Identified - We have identified the cause of the email delivery delays affecting customers in ZA. Engineering are working to resolve this. Further updates will be posted here as they become available. June 9, 2026 10:09AM UTC Monitoring - The email delivery delays affecting customers in ZA have been resolved. We are monitoring to ensure full stability. Further updates will be posted here as they become available. June 9, 2026 1:00PM UTC Resolved - The email delivery delays affecting customers in ZA have been resolved. We apologise for any inconvenience caused.

June 9, 2026 1:45AM UTC Investigating - We are aware of a service disruption that is impacting email delivery to Office 365 tenants for a subset of US hosted customers. We are investigating this issue and will post further updates here. June 9, 2026 2:31AM UTC Identified - We have identified the issue impacting email delivery to Office 365 tenants for a subset of US hosted customers and are working to resolve it. We will provide further updates as they become available. June 9, 2026 3:26AM UTC Monitoring - We have resolved the email delivery issue affecting Office 365 tenants for US-hosted customers. Mitigation efforts are ongoing for UK and ZA hosted customers, and we will provide further updates as work continues. June 9, 2026 4:02AM UTC Resolved - We can confirm that email delivery to Office 365 tenants has been restored for US, UK and ZA grids. All services should now be functioning normally. We appreciate your patience while we resolved this problem.

June 6, 2026 3:41AM UTC Investigating - We are aware that a small subset of customers hosted on our US grid may be experiencing a degraded service. We are currently investigating the issue and updates will be posted here as they become available. June 6, 2026 5:04AM UTC Identified - We believe we have identified the issue affecting a small subset of US-hosted customers and are working to resolve it. We will provide further updates as they become available. June 6, 2026 5:54AM UTC Monitoring - We have taken mitigation steps and continue to see improved services for previously impacted customers hosted on our US grid. We are continuing our resolution and further updates will be posted here. June 6, 2026 8:20AM UTC Resolved - We can confirm that we have solved the issue of a degraded service on the US grid. We appreciate your patience as we worked to resolve this issue.

June 3, 2026 10:54AM UTC Scheduled - We will be performing scheduled maintenance on our DE grid on Friday, 5th June 2026, from 17:00–21:00 UTC. During this maintenance window, we do not anticipate any disruption to your service, and all services should continue to operate as normal. However, in the unlikely event of any brief interruption, please be assured that no emails will be lost. Our teams will be working to complete all activity within the scheduled timeframe. Should any updates be required, they will be posted here on the Mimecast Service Status Page. If you have any questions, please contact the Mimecast Support team. June 5, 2026 5:00PM UTC Active - Scheduled maintenance is starting. June 5, 2026 9:00PM UTC Completed - Scheduled maintenance is complete.

June 1, 2026 9:32PM UTC Investigating - We are aware of a service disruption impacting access to the Partner Portal for some customers. Users may be unable to log in or may experience errors when attempting to access the portal. We are currently investigating the issue and will post further updates here as they become available. June 2, 2026 12:24AM UTC Resolved - We can confirm the service disruption impacting Partner Portal access has been resolved. All users should now be able to log in successfully. We apologise for any inconvenience caused and thank you for your patience while our team investigated and resolved the issue. If you continue to experience any problems, please don't hesitate to reach out.

May 26, 2026 1:37PM UTC Investigating - We are aware that some customers hosted on the German (DE) grid may be experiencing degraded service affecting email processing. We are currently investigating the issue, and updates will be posted here as they become available. May 26, 2026 1:54PM UTC Monitoring - We have taken mitigation steps and believe impact to the service has been addressed. While recovery continues, some small mail flow delays may persist as the backlog clears. Our Engineering team is closely monitoring performance and investigating the cause of the high load. Further updates will be provided as needed. May 26, 2026 2:25PM UTC Resolved - We can confirm that the issue affecting customers in the DE grid has been resolved. We appreciate your patience while we worked to resolve this issue.

May 20, 2026 9:08AM UTC Scheduled - We will be performing scheduled maintenance on our DE grid on Friday, 22nd May 2026, from 17:00-21:00 UTC IMPACT: Customers may experience intermittent disruption to email processing and access to the Administration Console. No emails will be lost. If the maintenance extends beyond the scheduled window, updates will be posted on the Mimecast Service Status Page. If you have any questions, please contact your Account Support team. May 22, 2026 5:00PM UTC Active - Scheduled maintenance is starting. May 22, 2026 9:00PM UTC Completed - Scheduled maintenance is complete.