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Outlook: S/MIME support for Shared Mailboxes and Delegate Mailboxes in New Outlook for Windows

Roadmap ID
565861
View in M365 Roadmap
Product
Outlook
Published
June 15, 2026
Status
In development
Cloud Instances
Worldwide (Standard Multi-Tenant)GCC
Release Phase
General Availability
Platform
Desktop
Expected Release
July 2026

Description

New Outlook for Windows will extend S/MIME support to shared mailboxes and delegate mailboxes associated with a user's primary account. Users will be able to sign, encrypt, decrypt, and reply to S/MIME-protected messages while working from shared and delegated mailboxes. #newoutlookforwindows

Change History

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No change history available

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