MC1182710 – M365 Change Digest

One-line summary

Outlook for Android adds in-app PDF attachment previews, allowing users to view PDFs directly without leaving the app. Rollout completes by end of January 2026.

Similar updates

Details

RoadmapIds

520386

FeatureStatusJson

{"520386":[{"RoadmapId":520386,"Platform":"Android","Status":"FeatureRolloutStatusNotSupported","LastUpdateTime":"2026-01-15T03:00:12.8728412Z","LatestRing":null},{"RoadmapId":520386,"Platform":"All","Status":"FeatureRolloutStatusNotSupported","LastUpdateTime":"2026-01-15T03:00:12.8728415Z","LatestRing":null}]}

Summary

Outlook for Android will support in-app PDF attachment previews starting late November 2025, completing by January 2026. This feature enables automatic PDF preview within the app, requires no admin setup, and affects all commercial and education users. No action is needed, but communication to helpdesk is recommended.

Platforms

Android

Body (from Message Center)

Updated January 13, 2026: We have updated the timeline. Thank you for your patience.

[Introduction]

To improve mobile productivity and streamline file access, Outlook for Android will soon support in-app PDF attachment previews. This update aligns with user feedback requesting faster, more integrated document viewing experiences without needing to switch apps.

This message is associated with Roadmap ID 520386.

[When this will happen:]

General Availability (Worldwide): Rollout begins in late November 2025 and is expected to complete by end of January 2026 (previously late December).

[How this affects your organization:]

Who is affected:

All users of Outlook for Android across commercial and education tenants.

What will happen:

Users will be able to preview PDF attachments directly within the Outlook for Android app.
The built-in previewer will launch automatically when a PDF is opened.
Users can still choose to open PDFs in other apps via the overflow menu.
This feature will be enabled by default; no admin configuration is required.

[What you can do to prepare:]

No action is required. This feature will be enabled automatically.

Optional steps:

Communicate this change to helpdesk staff to reduce potential support inquiries.
Update internal documentation if you reference mobile attachment handling.
If your organization prefers users to use a specific PDF viewer, consider communicating usage guidance.

[Compliance considerations:]

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

Raw JSON (for debugging)

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{
  "snapshot_item": {
    "action_required_by": null,
    "ai_action_required_by": "2026-01-31T00:00:00Z",
    "ai_actions": [
      "Inform helpdesk of new in-app PDF previews",
      "Update mobile documentation if needed",
      "Communicate PDF viewer preferences if applicable"
    ],
    "ai_master_tags": [
      "User",
      "Admin"
    ],
    "ai_model": "gpt-4.1",
    "ai_summary": "Outlook for Android adds in-app PDF attachment previews, allowing users to view PDFs directly without leaving the app. Rollout completes by end of January 2026.",
    "ai_topics": [
      "Exchange",
      "Outlook"
    ],
    "category": "stayInformed",
    "details_map": {
      "FeatureStatusJson": "{\"520386\":[{\"RoadmapId\":520386,\"Platform\":\"Android\",\"Status\":\"FeatureRolloutStatusNotSupported\",\"LastUpdateTime\":\"2026-01-15T03:00:12.8728412Z\",\"LatestRing\":null},{\"RoadmapId\":520386,\"Platform\":\"All\",\"Status\":\"FeatureRolloutStatusNotSupported\",\"LastUpdateTime\":\"2026-01-15T03:00:12.8728415Z\",\"LatestRing\":null}]}",
      "Platforms": "Android",
      "RoadmapIds": "520386",
      "Summary": "Outlook for Android will support in-app PDF attachment previews starting late November 2025, completing by January 2026. This feature enables automatic PDF preview within the app, requires no admin setup, and affects all commercial and education users. No action is needed, but communication to helpdesk is recommended."
    },
    "id": "MC1182710",
    "importance": 4,
    "is_major_change": false,
    "last_modified": "2026-01-14T17:42:35Z",
    "ms_products": [
      "Exchange"
    ],
    "platforms": "Android",
    "roadmap_ids": [
      "520386"
    ],
    "services": [
      "Exchange Online"
    ],
    "severity": "normal",
    "tags": [
      "Updated message",
      "New feature",
      "User impact"
    ],
    "title": "(Updated) Outlook for Android supports PDF attachment preview"
  }
}