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Mimecast Outage History

Uptime record, past incidents, and downtime history for Mimecast.

Checking current status...
89% uptime over 91 days
99.9% ✗ 99.5% ✗ 99% ✗ 95% ✗

90-Day Trend

Feb 25May 25

Monthly Uptime

Month Uptime Days Tracked Days with Issues
May 2026 76% 25 6
April 2026 86.7% 30 4
March 2026 100% 31 0
February 2026 100% 5 0

Uptime is calculated from daily worst-status snapshots. A day with any non-operational status counts as a day with issues.

Daily Status (Last 91 Days)

Feb 24 Today
Operational Degraded Partial Outage Major Outage Maintenance No Data

Incident History

May 2026
Degraded service for SAML authentication on US, USB and UK Grids
minor

Started: May 19, 4:38 PM

investigating
We have taken mitigation steps and believe we have resolved the issue affecting SAML authentication for customers hosted on our US, USB and UK grids. Successful authentication attempts are now being reported, and we are no longer seeing related errors in our monitoring systems. Our Engineering team is closely monitoring the situation to ensure continued stability. Further updates will be posted here as they become available.
May 19, 5:23 PM
monitoring
We believe we have identified the issue affecting some customers hosted on our US-B grid who are experiencing failures with SAML login attempts to the Administration Console and associated applications. Our Engineering team is actively investigating the underlying cause and is currently testing a change to validate the suspected configuration issue. We will provide further updates as they become available.
May 19, 4:58 PM
monitoring
We are aware that some customers hosted on our US-B grid may be experiencing issues with SAML login attempts to the Administration Console and associated applications. Other authentication methods are functioning normally. We are currently investigating the issue and updates will be posted here as they become available.
May 19, 4:38 PM
TTP URL and Browser Isolation Errors on US and USB Grids
minor

Started: May 19, 1:59 PM

investigating
We have taken mitigation steps and believe we have resolved the issue that caused certain TTP URL links to be incorrectly redirected through Browser Isolation for customers. This was caused by TTP URL links being incorrectly categorized as unknown, resulting in clean links being redirected through Browser Isolation and, in some cases, returning an error. We are now seeing a sustained reduction in Browser Isolation requests and believe service should be returning to normal. We will continue to...
May 19, 3:05 PM
monitoring
We are aware that some customers hosted on our US and USB grids may be experiencing issues accessing rewritten links, where URLs are being redirected through Browser Isolation and may result in an error. We are currently investigating this issue and will post updates here as they become available. All other Mimecast services are operating as normal.
May 19, 1:59 PM
Administration Console Loading Issues

Started: May 13, 12:48 AM

monitoring
We are aware that some customers hosted on our 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.
May 13, 12:48 AM
DE Grid - Degraded service impacting Cybergraph and other services
minor

Started: May 9, 8:45 AM

investigating
We have taken mitigation steps and believe the service degradation issue affecting Cybergraph and other services in the German (DE) grid has been resolved. We are closely monitoring performance and will provide further updates as they become available.
May 9, 7:31 PM
monitoring
We have taken mitigation steps and believe the service degradation issue affecting Cybergraph and other services in the German (DE) grid has been resolved. We are closely monitoring performance and will provide further updates as they become available.
May 9, 10:34 AM
monitoring
We have identified the issue affecting Cybergraph and other services in the German (DE) grid and are working to resolve it. We will provide further updates as they become available.
May 9, 9:40 AM
monitoring
We are aware that some customers hosted on our German (DE) grid may be experiencing degraded service affecting Cybergraph and other services. We are currently investigating the issue, and updates will be posted here as they become available.
May 9, 8:45 AM
April 2026
Aware 1.0 Performance Issue
minor

Started: Apr 24, 3:38 PM

investigating
We are observing sustained service improvements, and Mimecast telemetry is showing the error rate has returned to baseline. Customers should see normal processing and application accessibility, although there may be minor delays as any residual backlog clears. Our Engineering team continues to closely monitor availability and performance.
Apr 24, 11:45 PM
monitoring
Following our earlier update, mitigation actions have been implemented by Microsoft in relation to the underlying platform disruption impacting the East US region. We are seeing improved performance for customers on the Aware 1.0 platform; however, there may still be intermittent delays or retries while the environment fully stabilises. Our Engineering team continues to closely monitor performance and recovery. We will provide further updates here as they become available.
Apr 24, 8:51 PM
monitoring
We have identified an issue affecting some customers on the Aware 1.0 platform, resulting in delays and retries. This has been attributed to an underlying Azure platform disruption. Our Engineering teams are actively engaged with Microsoft to remediate this as quickly as possible.
Apr 24, 3:38 PM
Administration Console Loading Issues

Started: Apr 23, 3:06 AM

monitoring
We are aware that some customers hosted on our AU 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.
Apr 23, 3:06 AM
Automatic Threat Remediation non-actionable alerts
minor

Started: Apr 10, 10:24 PM

investigating
We are aware that some customers have been receiving alerts for Threat Remediation jobs that do not correspond to actionable items in the Administration Console. Customers in this situation can consider these non-actionable alerts, with no existing threats to remediate. We have identified the underlying cause and have deployed a corrective update. There will continue to be some alerts based on previously identified patterns that will be cleared over time.
Apr 10, 10:24 PM
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