check before: 2025-08-01
Product:
Copilot, Copilot Chat, eDiscovery, Entra, Exchange, Microsoft 365 admin center, Microsoft 365 Apps, Microsoft 365 Copilot, Outlook, Purview, Purview Communication Compliance, Purview Data Loss Prevention, Windows
Platform:
Android, iOS, Mac, Online, Web, Windows Desktop, World tenant
Status:
Launched
Change type:
Admin impact, New feature, Updated message, User impact
Links:
Details:
Summary:
Microsoft Outlook will roll out a Copilot chat feature to summarize email threads with one click, available to users with Copilot chat pinned, even without a Copilot license. The rollout starts late August 2025, is on by default, manageable by admins, and includes compliance and audit considerations.
Details:
Updated 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).
Change Category:
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Scope:
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Release Phase:
General Availability, Targeted Release
Created:
2025-07-30
updated:
2025-12-18
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 Outlook is introducing a Copilot chat feature that allows users to summarize email threads with one click, available from late August 2025 to January 2026, with summaries processed in the Microsoft cloud and subject to compliance and privacy policies.
Direct effects for Operations**
User Experience with Email Summarization
Users may experience confusion or frustration if the summarization feature generates inaccurate or misleading summaries, leading to miscommunication or missed information.
- roles: End Users, Customer Support
- references: https://learn.microsoft.com/copilot/microsoft-365/pin-copilot-chat-navbar, https://support.microsoft.com/office/summarize-an-email-thread-with-copilot-in-outlook-a79873f2-396b-46dc-b852-7fe5947ab640
Compliance and Data Management
The introduction of AI-generated summaries may lead to compliance issues if users save or share summaries without understanding the implications, potentially violating data protection regulations.
- roles: Compliance Officers, IT Administrators
- references: https://learn.microsoft.com/copilot/privacy-and-protections, https://learn.microsoft.com/microsoft-365/admin/activity-reports/microsoft-365-copilot-usage?view=o365-worldwide
Configutation Options**
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Data Protection**
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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 |
| 2025-12-18 | MC Last Updated | 08/13/2025 00:05:13 | 2025-12-12T20:47:14Z |
| 2025-12-18 | MC Messages | 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 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 mid-November 2025 (previously mid-October). | Updated 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). |
| 2025-12-18 | MC End Time | 12/29/2025 09:00:00 | 2026-03-02T09:00:00Z |
| 2025-12-18 | MC Summary | Microsoft Outlook will roll out a Copilot chat feature to summarize email threads with one click, available to users with Copilot chat pinned, even without a Copilot license. Deployment starts late August 2025, is on by default, and admins can manage access via policies and Entra ID groups. | Microsoft Outlook will roll out a Copilot chat feature to summarize email threads with one click, available to users with Copilot chat pinned, even without a Copilot license. The rollout starts late August 2025, is on by default, manageable by admins, and includes compliance and audit considerations. |
| 2025-08-13 | MC MessageTagNames | New feature, User impact, Admin impact | Updated message, New feature, User impact, Admin impact |
| 2025-08-13 | MC Summary | Outlook's Copilot chat now lets users summarize email threads with one click, available to those with Copilot chat pinned, even without a Copilot license. Rolling out worldwide from August to October 2025, it's enabled by default, manageable via policies, and integrates with compliance and audit features. | Microsoft Outlook will roll out a Copilot chat feature to summarize email threads with one click, available to users with Copilot chat pinned, even without a Copilot license. Deployment starts late August 2025, is on by default, and admins can manage access via policies and Entra ID groups. |
| 2025-08-13 | MC Last Updated | 07/30/2025 02:02:08 | 2025-08-13T00:05:13Z |
| 2025-08-13 | MC Messages | 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 General Availability (Worldwide): We will begin rolling out in mid-August 2025 and expect to complete by mid-October 2025. Targeted Release (Worldwide): We will begin rolling out in early August 2025 and expect to complete by mid-August 2025. | 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 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 mid-November 2025 (previously mid-October). |
| 2025-08-13 | MC Title | Microsoft Outlook: Copilot chat now available to summarize emails for more users | (Updated) Microsoft Outlook: Copilot chat now available to summarize emails for more users |
| 2025-08-13 | MC End Time | 11/16/2025 09:00:00 | 2025-12-29T09:00:00Z |
Last updated 1 week ago ago
