MC1129716 - Microsoft Outlook Mobile adds support for DLP policy tips and enforcement

Updated September 29, 2025: After further review, we need to roll this back.April 6, 2026: We apologizehave updated the timeline. Thank you for any inconvenience.your patience.

Introduction

The Outlook Mobile team is updating the release for iOS and Android will soon support Data Loss Prevention (DLP) policy tips and enforcement. This update helps users avoid accidental data leaks by providing inline alerts or pop-ups when sensitive content is detected—based on admin-configured DLP rules. This enhancement brings DLP behaviorPolicy Tips & Override for Outlook Mobile. A number of improvements have been made to the initial scope of this rollout, along with some unforeseen challenges that will be listed in Outlook Mobile in line with Outlook for desktop and web, ensuring consistent compliance enforcement across platforms.detail.

This message is associated with Microsoft 365 Roadmap ID 496146.

When this will happen

Production Build App Store Release for Android and iOS: We will communicateare targeting May 4th to submit to the app store, and on average it can take up to a week for Apple and Google to then distribute that build via Message center when we are ready to proceed. the App Stores.

How this affects your organization

WithThe following updates have been made to this update, organizations using Microsoft Purview DLP policies will see those policies enforced in Outlook Mobile. When users attempt to send messages containing sensitive information—such as credit card numbers or national IDs—they will receive policy tips or blocking dialogs, depending on how the policy is configured.

This change enhances your organization’s data protection posture and supports regulatory compliance. If DLP policies are already in placerollout for Outlook desktopMobile:

1. added Custom oversharing dialog support
2. added Custom policy information
3. added Policy tip evaluation performance improvements
4. added Attachment scanning
5. added Intune control for Android and iOS to turn Data Leak Prevention on or web, no additional configurationoff (default is required. The featureset to OFF)
6. temporarily removed External recipient rule validation

Due to unique challenges with external recipient rule validation we are removing External Recipient rule validation from this release pending changes to the implementation.

After feedback we have added an Intune control that is defaulted to OFF to give your organization the opportunity for validation and user training prior to enabling DLP on by defaultAndroid and requires no admin action to enable.

What you can do to prepareiOS. Documentation links for "DLP on Android and iOS" and "Intune controls for DLP in Mobile" will be provided in an update soon.

What you can do to prepare

• Review existing DLP policiesPlease prepare to validate your organization's rules in Microsoft Purviewa test environment prior to ensure they are scoped to include mobile clients.
• No new policies are required if DLP is already in useenabling Data Leak Prevention on Mobile, and where possible provide training for Outlook desktop or web.
• No additional licensing is needed beyond what is already in place for Microsoft Purview DLP.

Find more on this topic: Learn about data loss prevention.users which can greatly improve their success and overall experience with policy tips and rules.

Compliance considerations