MC1202974 – Microsoft Outlook: Customizable oversharing dialog for DLP in New Outlook

Product:

Exchange, Outlook, Purview, Purview Communication Compliance, Purview Data Loss Prevention, Purview Information Protection, Windows

Platform:

Online, US Instances, Windows Desktop, World tenant

Status:

In development

Change type:

New feature, User impact, Admin impact

Links:

498921

Details:

Summary:
New Outlook for Windows will offer a customizable oversharing dialog for DLP, allowing admins to tailor messages with multi-language support, business justifications, and dynamic tokens. Rolling out globally from January 2026, the feature is off by default and configurable via the Compliance portal.

Details:
[Introduction]
New Outlook for Windows will now support the ability to show a customizable oversharing dialog for Data Loss Prevention (DLP). This enhancement allows organizations to tailor the experience for end users when oversharing is detected, improving clarity and compliance.
This message is associated with Microsoft 365 Roadmap ID 498921.
[When this will happen]
General Availability (Worldwide): Rollout begins in early January 2026 and is expected to complete by late January 2026.
General Availability (GCC): Rollout begins in early February 2026 and is expected to complete by late February 2026.

Change Category:
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Scope:
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Release Phase:
General Availability

Created:
2025-12-23

updated:
2025-12-23

Task Type

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Docu to Check

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MS How does it affect me

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MS Preperations

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MS Urgency

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MS workload name

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linked item details

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summary for non-techies**

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Direct effects for Operations**

User Experience Impact from Oversharing Dialog
If the customizable oversharing dialog is enabled without proper preparation, users may receive confusing or unclear messages when attempting to share sensitive information, leading to frustration and potential non-compliance with data policies.
   - roles: End Users, Compliance Officers
   - references: https://learn.microsoft.com/purview/dlp-ol365-win32-policy-tips, https://www.microsoft.com/microsoft-365/roadmap?filters=&searchterms=498921

Admin Configuration Challenges
Admins may face challenges in configuring the new oversharing dialog settings without prior training or understanding, resulting in misconfigured DLP policies that could either over-restrict or under-restrict user actions.
   - roles: IT Administrators, Compliance Managers
   - references: https://learn.microsoft.com/purview/dlp-ol365-win32-policy-tips, https://www.microsoft.com/microsoft-365/roadmap?filters=&searchterms=498921

Configutation Options**

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Data Protection**

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explanation for non-techies**

Imagine you're organizing a big company event and you're in charge of sending out invitations. You want to make sure that the right people get the right information, and you definitely don't want to accidentally send sensitive details to someone who shouldn't have them. Now, think of Microsoft Outlook as your trusty assistant in this scenario.

In January 2026, Outlook is getting a new feature that acts like a friendly reminder, tapping you on the shoulder when you're about to share too much information. This is called the "customizable oversharing dialog" for Data Loss Prevention (DLP). It's like having a customizable pop-up that warns you when you're about to overshare, much like a helpful friend who nudges you when you're about to spill a secret at a party.

For the people managing these settings—think of them as the event planners—they can tailor these reminders to fit the needs of the organization. They can choose the language, add specific reasons why sharing might be okay, and even personalize the message to make it more relevant. It's like being able to write a note to yourself in your own words, reminding you why you should think twice before hitting "send."

This feature is turned off by default, so if you want to use it, you'll need to set it up in the Compliance portal, which is like the control room for all your event planning tools. Once it's set up, it works automatically, just like how a well-planned event runs smoothly because of all the preparation done beforehand.

So, in essence, this new Outlook feature is about giving you the tools to prevent accidental oversharing, ensuring that your communications are as secure and intentional as possible, much like making sure your event invitations only go to the right guests.