Microsoft Defender for Office 365 Is Changing How Promotional Emails Are Handled

Microsoft is updating Microsoft Defender for Office 365 with a new way to identify and manage promotional email, giving organizations more control over inbox clutter while allowing the system to learn from users’ actions.

Under the updated approach, incoming promotional messages will receive a “promotions” classification and, when configured by administrators, can automatically move into a dedicated Promotions folder.

Microsoft updated the rollout timeline on October 2, 2026. Worldwide general availability began in late July 2026 and is expected to finish by late October, while deployments to DoD, GCC and GCC High environments are scheduled to continue through late November.

The change is particularly relevant for Microsoft 365 administrators because the feature combines automated email classification, mailbox routing and machine-learning-based personalization.

What Is Changing in Microsoft Defender for Office 365?

The core change is relatively straightforward: Microsoft is introducing a dedicated promotions classification for incoming promotional messages.

During earlier private and public preview phases, Microsoft referred to the classification as “Bulk.” The final experience uses the more specific “promotions” label.

When the relevant settings are enabled, promotional messages can be moved automatically from the inbox into a newly created Promotions folder.

The system can also learn from what individual users do with those messages.

For example, if a user repeatedly moves promotional emails into the Promotions folder, that behavior can inform how similar messages are handled in the future. Conversely, moving messages out of the folder can provide a signal that the user wants those messages handled differently.

That makes the feature more than a simple mail-routing rule. It is designed to adapt to user behavior over time.

Updated Microsoft 365 Rollout Timeline

Microsoft’s latest update changes several dates from the original schedule.

The current timeline is:

Public Preview: Began in mid-April 2026 and was expected to complete by mid-May 2026.
Worldwide General Availability: Began in late July 2026 and is expected to complete by late October 2026.
DoD, GCC and GCC High: Began rolling out in late July 2026, with completion expected by late November 2026.

The timeline matters for organizations that operate across multiple Microsoft cloud environments because availability will not necessarily arrive everywhere at the same time.

Microsoft also says public-preview participation was limited and required organizations to contact Microsoft with their organization name, Tenant ID and onmicrosoft.com domain.

How the Promotions Folder Works

The Promotions folder is intended to separate promotional content from messages that users may consider more important or time-sensitive.

The process can be summarized as follows:

An incoming message is identified as promotional.
The message receives the promotions classification.
If Bulk Moves Enabled is active, the message can be moved to the Promotions folder.
User actions provide feedback about how similar messages should be handled.
Users can also create inbox rules that reference the promotions tag.

This creates several layers of control rather than relying entirely on a single automated decision.

Administrators control the organizational configuration, while users can influence their own experience through their mailbox actions and inbox rules.

What Administrators Need to Know

For IT teams, one of the most important aspects of the change is that administrators remain in control of the rollout and configuration.

During public preview, promotional tagging was opt-in and configured using Exchange transport rules. Folder routing was controlled through anti-spam policy settings, specifically the Bulk Moves Enabled setting.

Microsoft also provided the ability to scope the configuration to pilot security groups.

That makes a staged deployment possible for organizations that want to test the behavior with a limited group before expanding it.

At worldwide general availability, however, Microsoft says promotional tagging will be enabled by default for all tenants and will remain enabled.

That distinction is important: organizations have configuration choices around routing and the preview experience, but the underlying tagging behavior becomes a standard part of the service at general availability.

Users Can Train the Experience Through Their Actions

One of the more notable elements of the update is the role of user behavior.

Microsoft says the system learns when users move messages into or out of the Promotions folder. Those actions can influence how future messages are handled.

This could make the feature more useful for employees whose inboxes contain different mixes of newsletters, retail offers, marketing messages and other promotional content.

It also means organizations should consider explaining the new behavior to employees.

A user who sees an expected message moved into Promotions may need to understand that moving it back can influence future handling.

That is different from a conventional static mailbox rule, where the same condition generally produces the same result until an administrator or user changes the rule.

Outlook Client Support Is Rolling Out in Stages

Microsoft’s documentation distinguishes between support for the promotions tagging experience and support for the Promotions folder experience.

For tagging, the initially supported clients are:

Outlook on the web
Outlook for Windows

Other clients, including Outlook for iOS and Android and classic Outlook, are expected to follow subsequently.

The Promotions folder itself has broader stated support, including:

Outlook on the web
Outlook for Windows
Outlook for iOS and Android
Classic Outlook

For organizations with users working across multiple Outlook clients, that distinction could matter during the transition.

The underlying mailbox behavior may exist even when the full tagging experience is not yet presented identically across every client.

Why the Machine-Learning Element Matters

Microsoft’s compliance information explicitly identifies the change as involving AI or machine learning that interacts with customer data.

The relevant behavior is the system’s ability to learn from user actions and apply those preferences to future messages.

This does not necessarily mean administrators need to treat the feature as a completely new data platform. But it does mean the feature should be considered when organizations review their existing Microsoft 365 governance, mailbox policies and user communications.

Microsoft also states that the change affects how incoming email is processed because messages receive the promotions classification and may be moved automatically depending on configuration.

For organizations with strict internal policies around automated email processing, that is worth documenting.

What IT Teams Should Do Now

Organizations approaching or already entering the general-availability period can use the rollout as an opportunity to review their email-management practices.

Key preparation steps include:

Review anti-spam policies: Check whether Bulk Moves Enabled is configured as expected.
Review Exchange transport rules: Organizations that participated in preview should verify their tagging configuration.
Check pilot groups: If the feature was tested with selected security groups, review the results before broader deployment.
Update employee guidance: Explain what the Promotions folder means and how moving messages can influence future handling.
Review mailbox rules: Users may want to create rules that reference the promotions tag.
Monitor Microsoft documentation: Product behavior and client support can evolve during the rollout.

For administrators, the main task is less about manually sorting promotional mail and more about understanding how Microsoft’s automated classification fits into existing mail-flow controls.

What This Means for Everyday Outlook Users

For employees, the change could be relatively subtle.

Promotional messages that previously appeared alongside work-related correspondence may increasingly be separated into a dedicated folder, depending on the organization’s configuration and the user’s mailbox behavior.

The important point is that the Promotions folder is not simply a place where unwanted email disappears.

Users can continue accessing promotional messages, and their actions can influence future classification and routing.

That makes the feature particularly relevant for people who want to receive newsletters, discounts, product announcements or other marketing emails without having those messages dominate their primary inbox.

The Bigger Picture for Microsoft 365 Email Management

Microsoft’s update reflects a broader shift toward inbox management that combines centralized administrator policies with individualized user behavior.

Traditional email controls often depend on fixed rules: messages matching a condition go to a particular location.

The new promotions experience adds a behavioral component. Microsoft’s system can use what users do with messages to influence future handling, while administrators retain organizational controls over how the feature is deployed.

For IT departments, that creates a balance between automation and governance.

For users, it potentially means less manual sorting without completely losing access to promotional content.

What Comes Next

The immediate focus is the completion of Microsoft’s worldwide general-availability rollout by late October 2026, followed by the expected completion of the DoD, GCC and GCC High rollout by late November 2026.

Organizations should therefore expect the experience to continue evolving across supported Outlook clients as deployment progresses.

The most important practical question for administrators is not simply whether promotional email will be classified. It is how that classification interacts with existing anti-spam policies, Exchange rules, mailbox guidance and user expectations.

As Microsoft moves the feature from preview into broader availability, those organizations that understand the controls and communicate the change clearly will be better positioned to manage the transition without surprising users or disrupting legitimate promotional mail.