Users' Outlook for iOS app version 5.2602.0 may crash or freeze on iPad devices
ID: EX1220516
Issue type: Incident
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Impacted services
Exchange Online
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Details
Title: Users' Outlook for iOS app version 5.2602.0 may crash or freeze on iPad devices
User impact: Users' Outlook for iOS app version 5.2602.0 may have crashed or froze on iPad devices.
More info: Affected users could launch Outlook mobile while in Airplane Mode and then re-enable Wi-Fi and/or cellular data as a way to circumvent impact while we worked towards mitigation.
Final status: We've confirmed with a subset of previously affected users that the latest version of the Outlook mobile app (5.2602.1) successfully resolves the issue. Users without automatic updates configured may need to manually update to this version through the App Store.
Scope of impact: This issue may have affected all users' iPad devices using Outlook for iOS version 5.2602.0.
Start time: Tuesday, January 20, 2026, at 11:00 PM UTC
End time: Thursday, January 22, 2026, at 5:13 PM UTC
Root cause: The latest Outlook for iOS update contains a code error related to a change meant to refresh rather than restart tabs when feature flags were updated, which was resulting in this impact.
Next steps:
- We're reviewing our update testing and validation procedures to identify how impact was missed and better prevent similar future occurrences.
This is the final update for the event.
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