Roadmap › 565861

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

In development Outlook Desktop

General availability: 2026-07
Preview: —
Added: 15 Jun 2026
Last modified: 15 Jun 2026 23:00 UTC
First archived: 25 Aug 2026
Release rings: General Availability
Clouds: Worldwide (Standard Multi-Tenant), GCC

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

View on microsoft.com