check before: 2025-11-01
Product:
Entra, Purview, Purview Communication Compliance, Purview compliance portal, Purview Information Protection
Platform:
Online, Web, World tenant
Status:
In development
Change type:
New feature, Admin impact
Links:
Details:
Summary:
Microsoft Purview introduces Classifier Simulation Mode to test custom classifiers on production data before publishing, reducing false positives and improving performance. Available from early 2026, it provides health insights in the compliance portal, allowing admins to monitor, simulate, and optimize classifiers with role-based access control.
Details:
Updated December 16, 2025: We have made a minor correction. Thank you for your patience.
[Introduction]
Microsoft Purview is introducing Classifier Simulation Mode, the first phase of the broader Classifier Health Monitoring Platform. This new capability allows admins to test and validate custom classifiers on production data before publishing. Simulation Mode enables admins to optimize classifier logic before deployment, helping in reducing false positives, scanning latency, and noisy matches. Admins will access simulation controls and classifier health insights directly in the Microsoft Purview compliance portal, making it easier to monitor and improve classifier performance in one centralized location.
This message is associated with Roadmap ID 523201.
[When this will happen:]
Targeted Release (Worldwide): Rollout begins early November 2025, completes by early December 2025.
General Availability (Worldwide): Rollout begins late February 2026, completes by late March 2026.
Change Category:
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Scope:
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Release Phase:
General Availability
Created:
2025-11-13
updated:
2025-12-18
Public Preview Start Date
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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**
Classifier Performance Issues
If classifiers are published without prior simulation, there may be an increase in false positives and scanning latency, leading to inefficient data classification and potential compliance risks.
- roles: Admins, Compliance Officers
- references: https://www.microsoft.com/microsoft-365/roadmap?filters=&searchterms=523201
User Experience Degradation
Inefficient classifiers may lead to noisy matches, causing users to receive irrelevant alerts or notifications, negatively impacting their workflow and productivity.
- roles: End Users, Support Staff
- references: https://www.microsoft.com/microsoft-365/roadmap?filters=&searchterms=523201
Configutation Options**
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Data Protection**
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IT Security**
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explanation for non-techies**
Microsoft Purview is rolling out a new feature called Classifier Simulation Mode, which allows administrators to test custom classifiers on actual data before making them live. Think of it like trying on a new outfit in a fitting room before deciding to buy it. This way, you can see how it looks and feels without committing right away. Similarly, admins can use this simulation to see how their classifiers perform, helping to identify any issues like false positives or slow processing times before they are officially published.
This feature will be available to all users by early 2026 and is part of a larger effort to monitor and improve classifier health. It provides insights directly within the Microsoft Purview compliance portal, which acts like a dashboard where admins can keep an eye on how well their classifiers are doing. If a classifier isn't performing well, it might be automatically disabled to keep the system running smoothly, much like how a car's check engine light warns you to prevent further issues.
Admins don't need any special training to use this feature. They can choose to simulate a classifier or publish it directly. However, using the simulation can help reduce the risk of errors and improve overall performance, similar to how a test drive can help you decide if a car is the right fit before purchase.
In terms of compliance, the simulation mode allows for testing without changing how data is classified, ensuring that everything remains secure and compliant. Admins can manage access to these features through role-based permissions, akin to having different levels of access keys for various rooms in a building, ensuring that only the right people can make changes.
** AI generated content. This information must be reviewed before use.
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change history
| Date | Property | old | new |
| 2025-12-18 | MC Messages | [Introduction]
Microsoft Purview is introducing Classifier Simulation Mode, the first phase of the broader Classifier Health Monitoring Platform. This new capability allows admins to test and validate custom classifiers on production data before publishing. Simulation Mode enables admins to optimize classifier logic before deployment, helping in reducing false positives, scanning latency, and noisy matches. Admins will access simulation controls and classifier health insights directly in the Microsoft Purview compliance portal, making it easier to monitor and improve classifier performance in one centralized location. This message is associated with Roadmap ID 523201. [When this will happen:] Targeted Release (Worldwide): Rollout begins early November 2025, completes by early December 2025. General Availability (Worldwide): Rollout begins late February 2025, completes by late March 2026. | Updated December 16, 2025: We have made a minor correction. Thank you for your patience.
[Introduction] Microsoft Purview is introducing Classifier Simulation Mode, the first phase of the broader Classifier Health Monitoring Platform. This new capability allows admins to test and validate custom classifiers on production data before publishing. Simulation Mode enables admins to optimize classifier logic before deployment, helping in reducing false positives, scanning latency, and noisy matches. Admins will access simulation controls and classifier health insights directly in the Microsoft Purview compliance portal, making it easier to monitor and improve classifier performance in one centralized location. This message is associated with Roadmap ID 523201. [When this will happen:] Targeted Release (Worldwide): Rollout begins early November 2025, completes by early December 2025. General Availability (Worldwide): Rollout begins late February 2026, completes by late March 2026. |
| 2025-12-18 | MC Last Updated | 11/13/2025 00:48:56 | 2025-12-16T21:42:31Z |
| 2025-12-18 | MC Summary | Microsoft Purview introduces Classifier Simulation Mode, allowing admins to test custom classifiers on production data before publishing. Available via the compliance portal, it helps reduce false positives and improve performance. Rollout starts early November 2025, with health insights and optional simulation controls for admins. | Microsoft Purview introduces Classifier Simulation Mode to test custom classifiers on production data before publishing, reducing false positives and improving performance. Available from early 2026, it provides health insights in the compliance portal, allowing admins to monitor, simulate, and optimize classifiers with role-based access control. |
Last updated 4 weeks ago ago
