Status Page

O365 - Email/Outlook

2026-01-06	Status	Description
09:13 AM		EXCHANGE NOTICE Users may see an English user interface for Outlook on the web on mobile when configured for a non-English language Service Restored More info: Impacted users would see an English user interface for Outlook on the web when accessing the service through mobile devices on both Android and iOS, even when the user interface configuration was set to alternate languages. Final status: The service provider has identified that a recent service update contained misconfigured localization data, resulting in impact. They've rolled back the problematic changes throughout the affected environment and confirmed through internal testing that impact is remediated. Start time: Monday, December 22, 2025, at 9:00 PM AST End time: Tuesday, January 6, 2026, at 2:32 AM AST
09:09 AM		EXCHANGE NOTICE Users may be unable to send encrypted email Service Restored More info: Users receive a Non-Delivery Report (NDR) with an exception message of "Failed to bootstrap tenant." Final status: A large increase in requests for RMS encryption and decryption following an extended low traffic period due to December holidays resulted in resource throttling and this impact, as the service provider's processing resiliency didn't adapt in a timely manner. They increased database request processing capability, redeployed the affected encryption and decryption service used by RMS, and reallocated traffic within the region to restore service functionality and resolve the impact. Scope of impact: This issue may have affected any North America user of RMS trying to send encrypted email. Start time: Monday, January 5, 2026, at 11:55 AM AST End time: Monday, January 5, 2026, at 3:15 PM AST