Outlook for iOS will require iOS 18 or later starting late September 2025, dropping support for iOS 17 and earlier. Users on unsupported versions may face syncing issues. iPadOS 17 and watchOS 10 support will also end. Organizations should notify users to upgrade devices accordingly.
Applies to: Microsoft 365 suite · Microsoft 365 apps
Source: mc.merill.net — data via Merill Fernando's open archive (MIT).