Outlook: S/MIME support for Shared Mailboxes and Delegate Mailboxes in New Outlook for Windows
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 Product Outlook Release phase General Availability Release date July CY2026 Platform Desktop Cloud Instance Worldwide (Standard Multi-Tenant), GCC Created 2026-06-15 23:00:45Z Roadmap ID 565861 Roadmap Link https://www.microsoft.com/microsoft-365/roadmap?id=565861
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