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Roadmap ID 565861 In developmentGCC

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

Microsoft 365 Message Center Archive by Merill Fernando
Microsoft 365 roadmap entry

Summary

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

Status
In development
General availability target
Jul 2026
Preview target
Not published
Products
Outlook
Clouds
Worldwide (Standard Multi-Tenant), GCC
Release phases
General Availability
Platforms
Desktop
Source created
15 Jun 2026
Source modified
15 Jun 2026 · 5mo ago
ChangeIntel

An IT change radar: releases, security, known issues, retirements, documentation changes, and service status from public sources. Every item links to supporting evidence; dates and statuses can change after they are read.

Sources read 11 Nov 23:12 UTC · 273 of 275 readable · 271 fully read · documentation 469/469 current

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