Microsoft 365

Title: Some on-premises users may be unable to send or receive Exchange Online email messages on iOS and Android mobile devices User impact: On-premises users may be unable to send or receive Exchange Online email messages on iOS and Android mobile devices. Current status: We're reviewing service logs to determine our next troubleshooting steps. Scope of impact: Some on-premises users attempting to send or receive email messages on iOS and Android mobile devices may be impacted. Next update by: Wednesday, August 20, 2025, at 3:00 PM UTC

Title: Users may be unable to send or receive email from the Outlook mobile app on their devices User impact: Users may be unable to send or receive email from the Outlook mobile app on their devices. More info: Affected users would be utilizing Hybrid Modern Authentication (HMA). Current status: We're investigating a potential issue with Exchange Online and checking for impact to your organization. We'll provide an update within 30 minutes.

Title: Some users may be unable to access Office.com User impact: Users may be unable to access to access Office.com Current status: We're reviewing service monitoring telemetry to isolate the root cause and develop a remediation plan. Scope of impact: Impact is specific to some users attempting to access Office.com. Next update by: Wednesday, August 20, 2025, at 3:30 PM UTC

Title: Some on-premises users may be unable to send or receive Exchange Online email messages on iOS and Android mobile devices User impact: On-premises users may be unable to send or receive Exchange Online email messages on iOS and Android mobile devices. Current status: We're reviewing service logs to determine our next troubleshooting steps. Scope of impact: Some on-premises users attempting to send or receive email messages on iOS and Android mobile devices may be impacted. Next update by: Wednesday, August 20, 2025, at 3:00 PM UTC

Title: Users may be experience multiple issues in Exchange Online and Microsoft Teams User impact: Users may be experience multiple issues in Exchange Online and Microsoft Teams. More info: In Exchange Online, users may be unable to connect to their mailboxes through Outlook on the web, Messaging API (MAPI), Exchange ActiveSync (EAS) and Representational State Transfer (REST) API. In Microsoft Teams, users may be unable to place outbound or receive inbound calls; and sending and receiving messages may be impacted. Current status: We've identified through our internal monitoring and alerting systems that a network connectivity issue is occurring in the China region, resulting in impact to users' ability to utilize multiple features in Exchange Online and Microsoft Teams. We're investigating the source of the connectivity issue as we work to understand how impact manifests and formulate potential remediation strategies. Scope of impact: This issue may affect any user in the China region attempting to access their mailboxes in Exchange Online or use calling and messaging features in Microsoft Teams. Next update by: Tuesday, August 19, 2025, at 8:00 PM UTC

Title: Users may be unable to open the new Outlook desktop client app on Windows devices User impact: Users may be unable to open the new Outlook desktop client app on Windows devices. More info: As a workaround, affected users may be able to use the Outlook classic desktop client. Current status: We're analyzing support provided information to determine our next troubleshooting steps. Scope of impact: Your organization is affected by this event, and users attempting to open the new Outlook desktop client on Windows devices may be impacted. Next update by: Tuesday, August 19, 2025, at 5:30 PM UTC

Title: Some users are unable to access root site pages in SharePoint Online User impact: Users are unable to access root site pages in SharePoint Online. Current status: We're reviewing support provided information and service monitoring telemetry to determine our next troubleshooting steps. Scope of impact: Impact is specific to some users who are served through the affected infrastructure. Next update by: Monday, August 18, 2025, at 10:00 AM UTC

Title: Users may be unable to send or receive email from the Outlook mobile app on their devices User impact: Users may be unable to send or receive email from the Outlook mobile app on their devices. More info: Affected users would be utilizing Hybrid Modern Authentication (HMA). Current status: We're investigating a potential issue with Exchange Online and checking for impact to your organization. We'll provide an update within 30 minutes.

Title: Users may experience delays or failures across multiple Microsoft 365 services User impact: Users may experience delays or failures across multiple Microsoft 365 services. More info: Affected impact scenarios include, but aren't limited to: Exchange Online: - Unable to access the service using any connection method Microsoft Teams: - Unable to load meetings notes during Microsoft Teams meetings Microsoft Loop: - Unable to modify sensitivity labels in Loop components Microsoft Purview: - Compliance policy sync mail fail SharePoint Online: - Certain operations within SharePoint Online Current status: Current status: This is a continuation of the events previously communicated via TM1125264, MO1125240, and EX1125232. Our investigation has identified that a recent update to the Substrate data services pipeline contains an error, resulting in impact. We're in the process of reverting this change to remediate impact and will provide a mitigation timeline once available. Scope of impact: This issue affects Internal Microsoft Service Dog Food (SDF) users only. Start time: Wednesday, July 30, 2025, at 3:00 PM UTC Root cause: A recent update to the Substrate data services pipeline contains an error, resulting in impact. Next update by: Thursday, July 31, 2025, at 2:00 AM UTC