Trending Now - Global Microsoft Outlook Outage Disrupts Email Services

WHO:

Tom's Guide - Microsoft is the organization involved in the outage.

Tom's Guide - Users of Outlook are expressing frustration on social media platforms.

WHAT:

Tom's Guide - Users are experiencing sign-in issues with Outlook, particularly on the iOS app.

Tom's Guide - Downdetector reports indicate around 1,400 reports of issues during the outage.

Tom's Guide - Microsoft stated that users may experience intermittent sign-in failures, including “too many requests” errors or unexpected sign-outs.

TechRadar - A major Microsoft Outlook outage is occurring, affecting users globally.

WHERE:

Tom's Guide - The issues are reported by users across various locations, particularly in the U.S.

WHEN:

Tom's Guide - Microsoft promised an update by 1:30 p.m. UTC (8:30 a.m. ET) regarding the outage.

WHY:

Tom's Guide - Microsoft is investigating the underlying cause of the outage, which includes specific errors related to authentication key failures.

HOW:

Tom's Guide - Microsoft is reverting a recently introduced change to determine if this action provides relief from the impact of the outage.

Tom's Guide - Microsoft is closely monitoring service telemetry to identify potential root causes and mitigation steps.

(UPDATED April 27, 2026 17:23 UTC)

Microsoft is currently facing a significant outage affecting users of Outlook, particularly on the iOS app, with around 1,400 reports of issues logged on Downdetector. Users are expressing frustration on social media as they encounter sign-in problems, including errors related to authentication key failures and unexpected sign-outs. Microsoft is investigating the situation and plans to provide an update by 1:30 p.m. UTC, while also reverting a recent change to see if it helps alleviate the issues.