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:
Admin impact, New feature, Updated message
Links:
Details:
Summary:
Microsoft Purview introduces Classifier Simulation Mode for admins to test custom classifiers on production data before publishing, reducing false positives and improving performance. Available in the compliance portal, it launches in public preview March 2026 and general availability May 2026, with health insights and optional simulation controls.
Details:
Updated February 4, 2026: We have updated the timeline. 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:]
Public Preview: Rollout begins early March 2026 (previously early November 2025), completes by mid-April 2026 (previously early December 2025).
General Availability (Worldwide): Rollout begins late May 2026 (previously late February), completes by late May 2026 (previously late March).
Change Category:
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Scope:
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Release Phase:
General Availability
Created:
2025-11-13
updated:
2026-02-05
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**
Microsoft Purview's new Classifier Simulation Mode allows administrators to test and fine-tune custom classifiers on real data before publishing, reducing false positives and improving classification accuracy through the Microsoft Purview compliance portal.
Direct effects for Operations**
Classifier Performance Issues
Publishing classifiers without simulation may lead to false positives and inefficient performance, resulting in increased workload for admins to manage and rectify these issues post-deployment.
- roles: Admins, Compliance Officers
- references: https://www.microsoft.com/microsoft-365/roadmap?filters=&searchterms=523201
User Experience Degradation
If classifiers are published without prior simulation, users may experience delays and inaccuracies in data classification, leading to potential compliance risks and user frustration.
- roles: End Users, Data Analysts
- 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**
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** AI generated content. This information must be reviewed before use.
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change history
| Date | Property | old | new |
| 2026-02-05 | MC Last Updated | 12/16/2025 21:42:31 | 2026-02-04T19:03:42Z |
| 2026-02-05 | MC Messages | 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. | Updated February 4, 2026: We have updated the timeline. 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:] Public Preview: Rollout begins early March 2026 (previously early November 2025), completes by mid-April 2026 (previously early December 2025). General Availability (Worldwide): Rollout begins late May 2026 (previously late February), completes by late May 2026 (previously late March). |
| 2026-02-05 | MC 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. | Microsoft Purview introduces Classifier Simulation Mode for admins to test custom classifiers on production data before publishing, reducing false positives and improving performance. Available in the compliance portal, it launches in public preview March 2026 and general availability May 2026, with health insights and optional simulation controls. |
| 2026-02-05 | MC MessageTagNames | New feature, Admin impact | Updated message, New feature, Admin impact |
| 2026-02-05 | MC End Time | 05/01/2026 09:00:00 | 2026-06-30T09:00:00Z |
| 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 2 weeks ago ago
