Improved secure file preview experience in OneDrive for iOS and iPadOS

OneDrive for iOS and iPadOS will offer secure in-app preview of Word, Excel, and PowerPoint files without downloading, respecting existing Microsoft 365 security and compliance policies. This rollout begins in April 2026, is enabled by default, requires no action, and does not change file permissions or sharing. Introduction We’re introducing an improved secure file preview experience for Word, Excel, and PowerPoint files in the OneDrive mobile app for iOS and iPadOS. With this experience, users can preview files directly within the OneDrive app without downloading them to their device or opening them in standalone Microsoft 365 apps. Existing Microsoft 365 security, compliance, and access policies continue to be enforced, helping organizations maintain protection while improving mobile productivity. When this will happen: General Availability (Worldwide): We will begin rolling out in early April 2026 and expect to complete the rollout by late April 2026. How this affects your organization: Who is affected: All users who access OneDrive files using the OneDrive mobile app on iOS and iPadOS What will happen: Users can preview Word, Excel, and PowerPoint files directly within the OneDrive mobile app. Files are previewed securely without being downloaded or stored locally on the device. The experience is enabled by default. Existing Microsoft 365 security, compliance, sensitivity labels, Conditional Access, and access controls are respected. There is no change to file permissions, sharing behavior, or audit logging. What you can do to prepare: No action is required. Optionally, inform your helpdesk and users about the improved secure preview experience for mobile access. Review existing Conditional Access or mobile app protection policies if you have strict mobile access requirements. Learn more: Apply sensitivity labels to your files | Microsoft Support Compliance considerations: No compliance considerations identified. Review as appropriate for your organization. Message ID: MC1268909

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