Microsoft 365 Alert – Service Degradation – Exchange Online – Users’ Outlook for iOS app version 5.2602.0 may crash or freeze on iPad devices – RESOLVED

Announcements Shagufta Naaz

23/01/2026 07:18:00 AM

NHSmail Reference: INC46731389

Microsoft Reference: EX1220516

Issue Status: RESOLVED

Issue Description: Users’ Outlook for iOS app version 5.2602.0 may crash or freeze on iPad devices.

More info: Affected users can 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 work towards mitigation.

Final Update: 26/01/2026 08:51:00 AM – Microsoft has 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 affect all users’ iPad devices using Outlook for iOS version 5.2602.0. This information may be updated as our investigation continues.

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 are updated, which is resulting in this impact.

Next Steps: Microsoft are reviewing their update testing and validation procedures to identify how impact was missed and better prevent similar future occurrences.