Outlook for iOS: Minimum system requirements updated to iOS 26 and above

🚨 The Signal: Outlook for iOS will soon require iOS 26 or later, dropping support for older versions. This ensures optimal security and performance, but older devices will lose updates and eventually functionality.

The Impact

Users on outdated iOS devices face security risks from unpatched Outlook versions and potential loss of email access.

• Users on iOS 18 or older: Outlook will stop receiving security updates, increasing vulnerability.
• Users on iOS 18 or older: Outlook functionality will degrade, potentially losing email and calendar sync.
• Security teams: Increased risk from unpatched mobile devices accessing corporate data.
• IT administrators: Need to identify and manage unsupported devices to maintain security posture.

The Action

1. Review Intune or MDM reports to identify devices running iOS 18 or older.
2. Communicate to affected users the requirement to update their iOS version to 26 or higher.
3. Develop a plan for users unable to update their devices, such as device replacement or alternative access methods.
4. Ensure mobile device access policies (e.g., Conditional Access) enforce minimum OS versions for Outlook access.

Domain: Intune · Impact: high · Workload: Exchange Online · Essential Eight: Patch Applications, Patch Operating Systems · ISM: ISM-0304, ISM-1407, ISM-1501, ISM-1621, ISM-1622, ISM-1623, ISM-1654, ISM-1655, ISM-1690, ISM-1691, ISM-1692, ISM-1693, ISM-1694, ISM-1695, ISM-1696, ISM-1698, ISM-1699, ISM-1700, ISM-1701, ISM-1702, ISM-1704, ISM-1807, ISM-1808, ISM-1876, ISM-1877, ISM-1889, ISM-1901, ISM-1902, ISM-1905