Microsoft Roadmap, messagecenter and blogs updates from 19-10-2025

[Introduction]

Starting November 15, 2025, Outlook on the web and the new Outlook for Windows will begin rolling out an update to how inline images are represented in the HTML body of emails. This change is part of Microsoft’s ongoing security improvements and will affect how Outlook add-ins identify and process inline images using the attachment ID. Specifically, the update transitions from using tokenized image URLs to a more secure method using content IDs and request headers.

[When this will happen:]

This change will begin rolling out on November 15, 2025, to Production users. Rollouts to other environments will begin after Production rollouts are 100% complete.

[How this affects your organization:]

What’s changing:

Previously, inline images in the HTML mail body were represented with a URL containing the attachment ID as a query parameter. Developers could parse the HTML and do one of the following.

• Extract the ID from the URL and match it with the attachment ID they already had.
• Use the entire URL in the src attribute to get the Base64 value of the inline image.

Going forward, the URL for inline images will no longer contain the attachment ID. As a result, your current parsing logic won’t be able to correlate the inline image in the mail body with the attachment ID or Base64 value of the image.

What will happen:

• Images will be represented by a content ID (cid) in the src attribute. 
• Add-ins that extract the attachment ID from the image URL will no longer be able to correlate images reliably.
• With this change, add-ins must:
  • Parse the HTML message body and retrieve the cid value from the src attribute of the <img> element.
  • Use Office.context.mailbox.item.getAttachmentsAsync to retrieve an AttachmentDetailsCompose object.
  • To restore correlation, match the contentId property from the object to the cid value in the HTML.
  • To retrieve base64 value of the image attachment, use office.context.mailbox.item.getAttachmentContentAsync. 

Example AttachmentDetailsCompose object:

[
{
  "id": "AAkALgAAAAAAHYQDEapmEc2byACqAC/EWg0AW4xUByFbp0CroCNphMYEEAADMWhyywAAARIAEADghOrwhp8zR7umVQRBkN51",
  "name": "image.png",
  "contentType": "image/png",
  "size": 2371,
  "attachmentType": "file",
  "isInline": true,
  "contentId": "7957e11a-ce80-438b-87cd-611b3d6a3ec4"
}
]

[What you can do to prepare:]

• Update your add-in’s parsing logic to retrieve the cid value from the src attribute of inline images.
• Use getAttachmentsAsync to match the content ID with the image.
• Ensure your add-in supports both the previous and updated implementations during the rollout.
• Test your add-in to confirm it correctly identifies and processes inline images using the new method.
• Update internal developer documentation if it references the previous method of parsing inline image URLs.
• Communicate this change to helpdesk or support teams if they assist with Outlook add-in troubleshooting.
• Review the sample code provided in the Microsoft 365 Developer Blog: Changes to inline images in Outlook.
• Leave a comment on this post or in Microsoft 365 Developer Blog: Changes to inline images in Outlook if you have any questions.
• Watch the October 2025 Office Add-ins Community Call (YouTube link)

[Compliance considerations:]

Placing the content ID in the src attribute matches how classic Outlook on Windows represents inline images.

[Introduction]

We’re improving the reliability of Copilot chat by ensuring that conversations are preserved even when users navigate away from a chat. With this update, a session entry is created in the navigation pane as soon as a prompt is submitted. This allows users to return to the conversation later without losing context or progress.

This capability will be available to all users where Copilot has been enabled.

This message is associated with Microsoft 365 Roadmap ID 500638.

[When this will happen:]

• Worldwide (General Availability): Rolling out from October 27, 2025, to October 31, 2025
• GCC: Rolling out from November 3, 2025, to November 28, 2025
• GCC High: Rolling out from November 10, 2025, to November 28, 2025
• DoD: Rolling out from November 10, 2025, to November 28, 2025

[How this affects your organization:]

Who is affected: All users of Microsoft Copilot (Microsoft 365) in commercial, GCC, GCC High, and DoD environments.

What will happen:

• A session entry will now appear in the navigation pane immediately after a prompt is submitted.
• Users can navigate away from a chat and return later without losing the conversation.
• This update improves continuity and reduces the risk of session loss.
• No changes to admin settings or policies are required.

[What you can do to prepare:]

No admin action is required at this time. You may wish to:

• Inform helpdesk staff of this behavior change.
• Update internal documentation if you describe Copilot chat behavior.

[Compliance considerations:]

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

[Introduction]

This message is associated with Roadmap ID 503145.

[When this will happen:]

• General Availability (Worldwide): Rollout begins in late October 2025 and is expected to complete by late October 2025.

[How this affects your organization:]

• Global admins managing SharePoint Agents or Copilot Tuning in Microsoft 365.
• Organizations using Copilot Chat environments via Power Platform Admin Center (PPAC).

What will happen:

• A new Capacity Pack option will be available in MAC.
• Each Capacity Pack includes 25,000 Copilot messages/month.
• Admins can allocate packs to Copilot Chat environments via PPAC.
• MAC will automatically prioritize prepaid packs and switch to PAYG when exhausted.
• Usage monitoring will be available in PPAC, including:
  • Total messages consumed
  • Remaining prepaid capacity
  • Message allocation per environment
• Supports unlicensed users and automated provisioning.

[What you can do to prepare:]

• No admin action is required before rollout.
• After rollout, you may:
  • Review usage reports in PPAC.
  • Allocate Capacity Packs to environments as needed.
  • Update internal documentation if you track Copilot usage or billing.

Learn more: Use Copilot Studio prepaid capacity packs for Microsoft 365 Copilot Chat | Microsoft Learn

[Compliance considerations:]

Category	Explanation
Introduces or modifies AI/ML capabilities	Enables prepaid message allocation for Copilot agents, which interact with customer data.
Alters how admins monitor/report compliance	Adds new reporting capabilities in PPAC for message consumption and allocation.
Includes admin control	Admins can allocate Capacity Packs and monitor usage.
Can be controlled via Entra ID group membership	Environment provisioning and access can be scoped via Entra ID.

[Introduction]

You can now search for images in Microsoft Teams — whether it’s a screenshot, whiteboard photo, or any other visual shared in chats or channels. Images can be found by person name or message content in Autosuggest, while the Search Results Page also shows the chat or channel where the image was shared for added context.

This message is associated with Roadmap ID 505443.

[When this will happen:]

• Targeted release: Rollout begins early November 2025 and completes by mid-November 2025.
• Worldwide and GCC: Rollout begins mid-November 2025 and completes by early December 2025.
• GCC-H and DoD: Rollout begins early December 2025 and completes by mid-December 2025.

[How this affects your organization:]

Who is affected:

All Microsoft Teams users across Worldwide, GCC, GCC-H, and DoD environments.

What’s new:

Teams users can now search for images shared in chats and channels directly from the search bar. Image results are powered by message content, people involved, and on the Search Results Page, chat or channel location for added context.

• Image suggestions in Autosuggest: Start typing to reveal image results based on the sender or message keywords. 

• Screenshot 1: Image result suggestions in Autosuggest for a message keyword

  

• Clicking an image opens it in a lightbox with a carousel to browse related images.

• Screenshot 2: Image search results with Lightbox carousel

  

• New Images filter in Autosuggest: Click to view image suggestions only. This works with typing and in zero-query mode and can also be accessed using the is:image keyword.

• Screenshot 3: Image result suggestions on application of Image Filter

  

• Images tab on the Search Results Page: With the Images filter selected, pressing Enter opens a dedicated tab where each image result shows the message and chat/channel it was shared in. Clicking any image result also opens the carousel. 

• Screenshot 4: Image search results on the Search Results Page, showing message context and chat/channel location to help clarify relevance.

  

Note: Image search currently does not support text within images (OCR).

[What you can do to prepare:]

No preparation is needed. The new search capability is enabled up by default, but you may want to draw attention to these new capabilities in Teams.

[Compliance considerations:]

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

• Queue and User Group Metrics: Display of metrics based on both Queue and User group, providing a dual perspective on performance. This approach allows for more detailed and actionable insights, helping supervisors to better understand and optimize operations.


• Intent Group Integration: Incorporating Intent groups into analytics facilitates a more segmented analysis, helping to identify specific areas of improvement within different business units, Intent groups, and individual intents.