check before: 2025-09-01
Product:
Copilot, Defender, Microsoft 365 Copilot
Platform:
Android, Developer, iOS, Linux, Mac, Online, Web, Windows Desktop, World tenant
Status:
Rolling out
Change type:
New feature, User impact, Admin impact
Links:
Details:
Summary:
Microsoft 365 Copilot will support delegate mailbox access starting late September 2025, allowing users with delegate permissions to use Copilot on those emails across multiple platforms. No permission changes are needed, the feature is on by default, and admin policies remain unchanged.
Details:
[Introduction:]
We're introducing support for Microsoft 365 Copilot in delegated mailboxes. This update enables users with delegate access to use M365 Copilot to reason over emails in those mailboxes, improving productivity and collaboration in shared scenarios. To use this feature, users must have a Microsoft 365 Copilot license.
This message is associated with Microsoft 365 Roadmap ID 416062.
[When this will happen:]
General Availability (Worldwide): Rollout will begin in late September 2025 and is expected to complete by late September 2025.
Change Category:
XXXXXXX ... free basic plan only
Scope:
XXXXXXX ... free basic plan only
Release Phase:
General Availability
Created:
2025-10-01
updated:
2025-10-01
Task Type
XXXXXXX ... free basic plan only
Docu to Check
XXXXXXX ... free basic plan only
MS How does it affect me
XXXXXXX ... free basic plan only
MS Preperations
XXXXXXX ... free basic plan only
MS Urgency
XXXXXXX ... free basic plan only
MS workload name
XXXXXXX ... free basic plan only
linked item details
XXXXXXX ... free basic plan only
Pictures
XXXXXXX ... free basic plan only
summary for non-techies**
XXXXXXX ... free basic plan only
Direct effects for Operations**
User Privacy Concerns
Delegates will have access to reason over emails in the delegated mailbox, which may lead to unintended exposure of sensitive information if users are not aware of this capability.
- roles: End Users, IT Support Staff
- references: https://support.microsoft.com/topic/use-copilot-in-shared-mailboxes-and-delegate-mailboxes-3e7e5130-eabe-4c19-94ea-117b2a4c14d6, https://www.microsoft.com/microsoft-365/roadmap?filters=&searchterms=416062
Increased Helpdesk Queries
The introduction of Copilot in delegated mailboxes may lead to an increase in helpdesk queries as users seek clarification on how delegate access works and the implications of using Copilot.
- roles: Helpdesk Staff, End Users
- references: https://support.microsoft.com/topic/use-copilot-in-shared-mailboxes-and-delegate-mailboxes-3e7e5130-eabe-4c19-94ea-117b2a4c14d6, https://www.microsoft.com/microsoft-365/roadmap?filters=&searchterms=416062
Configutation Options**
XXXXXXX ... paid membership only
Data Protection**
XXXXXXX ... paid membership only
IT Security**
XXXXXXX ... paid membership only
explanation for non-techies**
XXXXXXX ... free basic plan only
** AI generated content. This information must be reviewed before use.
a free basic plan is required to see more details. Sign up here
A cloudsocut.one plan is required to see all the changed details. If you are already a customer, choose login.
If you are new to cloudscout.one please choose a plan.
Last updated 6 days ago
