MC1154300 – M365 Change Digest

One-line summary

Starting October 2025, Microsoft Edge for Windows will use the Adobe PDF viewer by default; opt-out via policy ends September 2026, after which all users move to the new viewer.

Similar updates

Details

RoadmapIds

489231

Summary

Starting October 2025, Microsoft Edge on Windows will default to an Adobe-powered PDF viewer for enterprise users, enhancing performance and features. Rollout completes by March 2026. Admins can manage or opt out via policies until September 2026, after which the new viewer becomes mandatory.

Platforms

Web

Body (from Message Center)

Updated May 18, 2026: We have updated the opt-out timeline. Thank you for your patience.

[Introduction]

Starting in October 2025, Microsoft Edge version 141 will introduce the Adobe-powered PDF viewer as the default experience for enterprise users on Windows. This change enhances performance, accessibility, and compatibility, and introduces exclusive enterprise features. It follows our earlier public announcement and aligns with Roadmap ID 489231 and MC post MC1072406.

General Availability: Migration will occur on a phased rollout. Rollout will begin October 2025 and will complete March 2026.

[How this affects your organization:]

Who is affected:

All enterprise users on Windows using Microsoft Edge.

What will happen:

The Adobe-powered PDF viewer will replace the legacy viewer as the default experience.
User interface and controls will remain unchanged.
The new viewer offers improved performance, accessibility, compatibility, and exclusive enterprise features.

Admins can manage the experience using two policies:

NewPDFReaderEnabled: Controls the default viewer in Edge for Windows.

NewPDFReaderWebView2List: Controls viewer behavior in WebView2 apps.

Policy behavior:

Policy State	Before Enablement by Default	After Enablement by Default
Default	Old PDF Viewer	New PDF Viewer
Enabled	New PDF Viewer	New PDF Viewer
Disabled	Old PDF Viewer	Old PDF Viewer

[What you can do to prepare:]

No action is required if your organization is ready to adopt the new viewer.

If you wish to manage the experience:

Enable the new viewer early using the NewPDFReaderEnabled policy.
Opt-out by disabling the same policy. Opt-out will be supported until September 2026, at which time the policy will be deprecated and any remaining organizations will be moved to the new viewer.
Review and update internal documentation if needed.
Communicate this change to helpdesk or support teams.

Learn more: Microsoft Edge and Adobe partner to improve the PDF experience.

For support, contact your Microsoft CSAM or CSS representative.

[Compliance considerations:]

No compliance considerations identified, review as appropriate for your organization.

Raw JSON (for debugging)

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    "details_map": {
      "Platforms": "Web",
      "RoadmapIds": "489231",
      "Summary": "Starting October 2025, Microsoft Edge on Windows will default to an Adobe-powered PDF viewer for enterprise users, enhancing performance and features. Rollout completes by March 2026. Admins can manage or opt out via policies until September 2026, after which the new viewer becomes mandatory."
    },
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