M365 Archive

RM518287 - Outlook: LDAP directory support for S/MIME in New Outlook

Microsoft 365 Roadmap

Summary

The new Outlook now supports LDAP (Lightweight Directory Access Protocol) directories for sending S/MIME encrypted emails. This allows users to add an LDAP directory in the new Outlook and use it to fetch recipients’ certificates from the configured directory when sending S/MIME encrypted messages. #newoutlookforwindows

Roadmap ID

518287

View in M365 Roadmap

Last Updated

May 29, 2026

Published Oct 27, 2025

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Status

Rolling out

Release

General Availability

Platforms

Desktop

Service

Outlook

Tag

Rolling out
General Availability
Worldwide (Standard Multi-Tenant)
GCC

Cloud

GCC
Worldwide (Standard Multi-Tenant)

Description

The new Outlook now supports LDAP (Lightweight Directory Access Protocol) directories for sending S/MIME encrypted emails. This allows users to add an LDAP directory in the new Outlook and use it to fetch recipients’ certificates from the configured directory when sending S/MIME encrypted messages. #newoutlookforwindows

GA date: May CY2026

Version history

2 versions tracked

Updated 1 time since Apr 13, 2026. Microsoft Message Center only ever shows the current version; this archive preserves the history.

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  1. May 29, 2026 · 10:30 PMLatest · v2

    Changed: Body, Tags, Status

  2. Apr 13, 2026 · 11:15 PMOriginal · v1

    Changed: Initial version

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