January 23, 2026 8:31PM UTC
RESOLVED
We are closing out this Microsoft incident.
Thank you,
Silversky SupportJanuary 23, 2026 6:58AM UTC
MONITORING
Update 1/23/2026 @ 1:50am EST
This is the latest update from Microsoft:
Current status: Issue has been resolved by Microsoft.
Scope of impact: Any users served through an affected section of service infrastructure in the North America region may be intermittently impacted. This could affect users located in Asia-Pacific, Europe, or Latin America.
Root cause: We identified that the issue was caused by elevated service load resulting from reduced capacity during maintenance for a subset of North America hosted infrastructure.
Thank you,
SilverSky SupportJanuary 23, 2026 6:09AM UTC
IDENTIFIED
Update 1/23/2026 @ 1:30am EST
This is the latest update from Microsoft:
Current status: We’ve a high level of confidence that the incident is largely resolved. Access to Microsoft Defender for Office, Microsoft Purview, and DNS functionality has been restored, and Exchange Online mail flow remains stable.
We're continuing to fine tune load balancing adjustments and closely monitor the impact of recent changes to support sustained recovery. While recovery efforts remain ongoing, we are methodically addressing the small number of remaining affected services to ensure full service stability.
Scope of impact: Any users served through an affected section of service infrastructure in the North America region may be intermittently impacted. This could affect users located in Asia-Pacific, Europe, or Latin America.
Root cause: We identified that the issue was caused by elevated service load resulting from reduced capacity during maintenance for a subset of North America hosted infrastructure.
Thank you,
SilverSky SupportJanuary 23, 2026 4:40AM UTC
IDENTIFIED
Update 1/22/2026 @ 11:30pm EST
This is the latest update from Microsoft:
Current status: We’ve identified elevated service load combined with temporary capacity constraints during maintenance resulted in impact. We’re seeing positive signs of recovery in mail delivery, and mitigation actions are in place to better manage service load. While some connectivity impact remains between Microsoft Defender for Office, Microsoft Purview, and Exchange Online, and DNS lookup failures, engineers are actively working to restore full functionality.
Scope of impact: Any users served through an affected section of service infrastructure in the North America region may be intermittently impacted. This could affect users located in Asia-Pacific, Europe, or Latin America.
Root cause: We've identified that the issue was caused by elevated service load resulting from reduced capacity during maintenance for a subset of North America hosted infrastructure.
Thank you,
SilverSky SupportJanuary 23, 2026 3:40AM UTC
IDENTIFIED
Update 1/22/2026 @ 10:30pm EST
This is the latest update from Microsoft:
Current status: We’re continuing to see steady improvements in service availability for Exchange Online and Microsoft Teams and our broader recovery efforts remain actively underway. Engineers are further refining load balancing measures to accelerate recovery and are methodically addressing the remaining impacted services.
We do not yet consider this issue resolved and we remain committed to treating this issue with the highest urgency and priority. We understand how difficult it can be to operate without a confirmed estimated time to resolution. Please be assured that our teams are actively investigating and addressing the underlying causes of the impact, and we will share an estimated time for resolution as soon as one becomes available.
Scope of impact: Any users served through an affected section of service infrastructure in the North America region may be intermittently impacted. This could affect users located in Asia-Pacific, Europe, or Latin America.
Root cause: A portion of dependent service infrastructure in the North America region isn't processing traffic as expected.
Thank you,
SilverSky SupportJanuary 23, 2026 3:06AM UTC
IDENTIFIED
Update 1/22/2026 @ 9:33pm EST
This is the latest update from Microsoft:
Current status: We’re seeing continued improvements in service availability and functionality as a result of our load-balancing efforts. We’re actively monitoring performance and making targeted adjustments to further improve stability and availability, while continuing recovery actions to ensure a reliable service experience.
Scope of impact: Any users served through an affected section of service infrastructure in the North America region may be intermittently impacted. This could affect users located in Asia-Pacific, Europe, or Latin America.
Root cause: A portion of dependent service infrastructure in the North America region isn't processing traffic as expected.
Thank you,
SilverSky SupportJanuary 23, 2026 2:10AM UTC
IDENTIFIED
Update 1/22/2026 @ 8:56pm EST
This is the latest update from Microsoft:
Current status: We’re refining our load balancing efforts to optimize performance and reduce potential impact. In parallel, we’re assessing alternative solutions to reinforce recovery and enhance long term stability.
Scope of impact: Any users served through an affected section of service infrastructure in the North America region may be intermittently impacted. This could affect users located in Asia-Pacific, Europe, or Latin America.
Root cause: A portion of dependent service infrastructure in the North America region isn't processing traffic as expected.
Thank you,
SilverSky SupportJanuary 23, 2026 12:24AM UTC
IDENTIFIED
Update 1/22/2026 @ 7:15pm EST
This is the latest update from Microsoft:
Current status: We're continuing to refine our load balancing configurations to remedy residual imbalances across the environment and further our ongoing recovery efforts.
Scope of impact: Any users served through an affected section of service infrastructure in the North America region may be intermittently impacted.
Root cause: A portion of dependent service infrastructure in the North America region isn't processing traffic as expected.
Thank you,
SilverSky SupportJanuary 22, 2026 11:27PM UTC
IDENTIFIED
Update 1/22/2026 @ 6:23pm EST
This is the latest update from Microsoft:
Current status: During our ongoing efforts to rebalance traffic across the region, we introduced a targeted load balancing configuration change intended to expedite the recovery process, which incidentally introduced additional traffic imbalances associated with persistent impact for a portion of the affected infrastructure. We're remedying our load balancing configurations while, in parallel, reviewing the viability of expediting our ongoing incremental rebalancing and recovery efforts.
Scope of impact: Any users served through an affected section of service infrastructure in the North America region may be intermittently impacted.
Root cause: A portion of dependent service infrastructure in the North America region isn't processing traffic as expected.
Thank you,
SilverSky SupportJanuary 22, 2026 10:22PM UTC
IDENTIFIED
Update 1/22/2026 @ 5:15pm EST
This is the latest update from Microsoft:
Current status: We're carefully rebalancing traffic across all affected infrastructure in the region, while monitoring the corresponding health telemetry, to ensure the environment enters into a balanced state as our remediation efforts continue. We’re proceeding as quickly as possible and this incremental approach will also help us identify whether any additional actions may be required to ensure longstanding recovery.
Scope of impact: Any users served through an affected section of service infrastructure in the North America region may be intermittently impacted.
Root cause: A portion of dependent service infrastructure in the North America region isn't processing traffic as expected.
Thank you,
SilverSky SupportJanuary 22, 2026 9:29PM UTC
IDENTIFIED
Update 1/22/2026 @ 4:30pm EST
This is the latest update from Microsoft:
Current status: While we've restored the affected infrastructure to a heathy state, further load balancing is required to mitigate persistent impact. We've identified and are implementing additional actions to direct requests and traffic to additional healthy sections of infrastructure to achieve withstanding recovery.
Scope of impact: Any users served through an affected section of service infrastructure in the North America region may be intermittently impacted.
Root cause: A portion of dependent service infrastructure in the North America region isn't processing traffic as expected.
Thank you,
SilverSky SupportJanuary 22, 2026 8:24PM UTC
IDENTIFIED
Update 1/22/2026 @ 3:35pm EST
SilverSky is currently tracking an issue related to Microsoft 365 service availability. This is the current update from Microsoft:
User impact: Users may be seeing degraded service functionality across multiple Microsoft 365 services. More info: Users may be receiving a "451 4.3.2 temporary server issue" error message when attempting to send mail through Outlook. Some of the impacted service functions include, but may not be limited to:
- Sending and receiving email through Exchange Online, including notification email from Microsoft Viva Engage.
- Accessing the service portals, including Microsoft Purview and Microsoft Defender XDR.
Current status: We're reviewing the reported impact scenarios and identifying what portion of the dependent service infrastructure is degraded so we can determine our next troubleshooting steps.
Scope of impact: The scope of this issue is currently being investigated.
https://status.cloud.microsoft/m365/referrer=serviceStatusRedirect
(There have been intermittent issues accessing this portal due to Microsoft's issues.)
Thank You,
SilverSky Support