Status Page

O365 - Email/Outlook

2026-02-02	Status	Description
10:49 AM		EXCHANGE NOTICE Users' contacts hidden from the Global Address List (GAL) may not appear in Outlook on the web people search results Service Degradation Current status: The service provider is reviewing service monitoring telemetry to isolate the source of the issue and establish a fix.
09:14 AM		EXCHANGE NOTICE Users routing their Exchange Online email through a third-party protection service may have send and receive delays Service Restored More info: This issue specifically impacted users who use Simple Mail Transfer Protocol (SMTP) as their Exchange Online connection method and routed their email messages through a specific third-party email protection service. The email delays, which impacted both sending and receiving email, occurred in all Exchange Online connection methods. Final status: The service provider has fully implemented their identified configuration change and confirmed using internal telemetry that it effectively mitigated this issue. Thy determined that this issue was due to an issue with cache limit configuration that helps facilitate the impacts scenario process with SMTP mail flow. Scope of impact: This problem may have impacted any user sending or receiving email messages when leveraging a specific third-party email protection service. Start time: Monday, January 26, 2026, at 3:00 AM AST End time: Friday, January 30, 2026, at 3:25 PM AST

2026-01-30	Status	Description
02:03 PM		EXCHANGE NOTICE Users may experience delays when sending or receiving Exchange Online email messages Service Degradation More info: This issue specifically impacts users who are on Simple Mail Transfer Protocol (SMTP) connection methods, which include Outlook on the web, the Outlook desktop clients, and the mobile apps. Current status: The service provider's investigation has further identified that exceptions may be occurring as their mail transport service is sending an unexpectedly large amount of requests to downstream components in the mail routing code path. They're investigating recent changes to confirm this theory and determine next steps for remediation.