M365 Archive

RM563806 - Outlook: Emails marked with External to be supported as Rules conditions

Microsoft 365 Roadmap

Summary

The External tag on an email, set by the ExternalInOutlook feature, will now be usable as a condition in Outlook Inbox Rules. This change also makes available the ability to create or modify these Rules on the new Outlook for Windows, Outlook Web, and Outlook for Mac.

Roadmap ID

563806

View in M365 Roadmap

Published

May 21, 2026

Status

In development

Release

General Availability

Platforms

Android
Desktop
iOS
Mac
Web

Service

Exchange
Outlook

Tag

In development
General Availability
Worldwide (Standard Multi-Tenant)
GCC
GCC High
DoD

Cloud

DoD
GCC
GCC High
Worldwide (Standard Multi-Tenant)

Description

The External tag on an email, set by the ExternalInOutlook feature, will now be usable as a condition in Outlook Inbox Rules. This change also makes available the ability to create or modify these Rules on the new Outlook for Windows, Outlook Web, and Outlook for Mac.

GA date: June CY2026