Microsoft Outlook: Copilot chat now available to summarize emails for more users
From Microsoft 365 Message Center Archive by Merill Fernando · Microsoft may not have sent this notice to your tenant.Rollout
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Rollout dates are often only in the text. When Microsoft moves them, the change shows under "What changed".
Schedule dates changed in the text
Date phrases in schedule sentences differ between the versions this installation saw- Seen 12 Dec 2025
mid-November 2025→ end of January 2026 - Seen 12 Aug 2025
mid-August 2025, mid-October 2025, early August 2025→ late August 2025, mid-September 2025, mid-November 2025
Read from date phrases in Microsoft's text, not from notice metadata. A changed phrase can be a moved rollout, a new milestone or just rewording; "What changed" below shows which.
What the notice says
Microsoft’s text, safely structuredUpdated December 12, 2025: We have updated the timeline. Thank you for your patience.
Introduction
We’re introducing a new way to quickly summarize email threads in Outlook using Copilot chat. With a single click, users can generate a summary of the current email conversation directly from the reading pane. This feature enhances productivity by helping users quickly understand long or complex threads.
This capability will be available to users with Copilot chat enabled—even if they don’t have a Microsoft 365 Copilot license—provided they have pinned Copilot chat to the navigation bar. It will be available in both Classic and New Outlook for Windows.
When this will happen
Targeted Release (Worldwide): We will begin rolling out in late August 2025 (previously early August) and expect to complete by mid-September 2025 (previously mid-August).
General Availability (Worldwide): We will begin rolling out in mid-September 2025 (previously mid-August) and expect to complete by end of January 2026 (previously mid-November 2025).
How this will affect your organization
- Users without a Microsoft 365 Copilot license who have Copilot chat and pinning enabled will see a new Summarize button in the reading pane. Selecting this button will open Copilot chat and generate a summary of the current email thread.
- This feature is on by default for eligible users and does not require additional configuration.
- Usage can be viewed in the Microsoft 365 admin center.
- Audit logging may apply if summaries are saved or shared.
- Data is processed according to Copilot chat’s privacy terms.
What you can do to prepare
Admins can manage access to the Summarize feature by controlling access to Copilot chat:
- Use policy settings and Entra ID group membership to manage access.
- Pin Copilot chat to the navigation bar to enable the feature.
Learn more:
- Pin Microsoft 365 Copilot Chat to the navigation bar | Microsoft 365 Copilot | Microsoft Learn
- Microsoft 365 reports in the admin center – Microsoft 365 Copilot usage | Microsoft Learn
- Privacy and protections | Copilot | Microsoft Learn
- Entry point overview - (video) Summarize an email thread with Copilot in Outlook | Copilot in Outlook | Microsoft Support
Compliance considerations
| Does the change store new customer data, if so, where, and is the data cached or permanently stored? | The AI-generated summary data is processed in the Microsoft cloud. It may be temporarily stored or cached to support the summarization experience, but it is not permanently retained unless explicitly saved by the user. |
|---|---|
| Does the change alter how existing customer data is processed, stored, or accessed (e.g. documents, emails, chats, etc.), if so how and to what extent? | The feature uses existing email content to generate summaries via Copilot chat, which introduces a new processing layer for user data. This does not alter the original data but adds a temporary AI-generated output. |
| Does the change introduce or significantly modify AI/ML or agent capabilities that interact with or provide access to customer data, if so summarize changes? | This feature introduces a new AI-powered summarization capability via Copilot chat that interacts with email threads to generate contextual summaries. |
| Does the change provide users any new way of interacting with generative AI, if so how? | Users can now interact with Copilot chat directly from the reading pane to generate summaries of email threads, even without a Microsoft 365 Copilot license (if Copilot chat and pinning are enabled). |
| Does the change modify, interrupt, or disable any of the following capabilities (Purview): Data Loss Prevention (DLP), eDiscovery, retention policies, etc.? | While the feature does not disable existing Purview capabilities, administrators should review DLP, eDiscovery, and retention policies to ensure they apply appropriately to AI-generated content, especially if summaries are saved or shared. |
| Does the change alter how admins can monitor, report on, or demonstrate compliance activities e.g. Purview or admin reporting, if so summarize the changes? | If summaries are saved or shared, they may be subject to audit logging and reporting through Microsoft Purview. Admins should verify whether usage of the Summarize feature is captured in audit logs. |
| Does the change include an admin control and, can it be controlled through Entra ID group membership? | Access to Copilot chat and the Summarize feature can be managed via policy settings and Entra ID group membership. |
| Does the change allow a user to enable and disable the feature themselves? | Users with access to Copilot chat and pinning can choose whether to use the Summarize button in Outlook. |
What changed
Between archive captures, newest firstUpdated
AugustDecember 12, 2025: We have updated the timeline. Thank you for your patience. … rolling out in mid-September 2025 (previously mid-August) and expect to complete bymid-November 2025end of January 2026 (previouslymid-October).mid-November 2025). How this will affect your organization Users without a Microsoft 365 Copilot …- Tags
New feature, User impact, Admin impact→ Updated message, New feature, User impact, Admin impact
Updated August 12, 2025: We have updated the timeline. Thank you for your patience. Introduction We’re introducing a new way to quickly summarize email threads in … in both Classic and New Outlook for Windows. When this will happen
General AvailabilityTargeted Release (Worldwide): We will begin rolling out inmid-Augustlate August 2025 (previously early August) and expect to complete bymid-October 2025. Targeted Releasemid-September 2025 (previously mid-August). General Availability (Worldwide): We will begin rolling out inearly August 2025mid-September 2025 (previously mid-August) and expect to complete bymid-August 2025.mid-November 2025 (previously mid-October). How this will affect your organization Users without a Microsoft 365 Copilot …- Tags
- · first version seen
Learn more
Links from the notice and their documentation checks- Pin Copilot chatNot read yet
- Microsoft 365 reports in the admin center – Microsoft 365 Copilot usage | Microsoft LearnNot read yet
- Privacy and protections | Copilot | Microsoft LearnNot read yet
- (video) Summarize an email thread with Copilot in Outlook | Copilot in Outlook | Microsoft SupportNot read yet
Related public evidence
No related evidence found in this installation's recent collection. This does not establish that no announcement exists.
Not confirmed here
What this page cannot tell you- Whether your tenant is affected: this is Microsoft's notice, not a check of your settings.
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