Use Sensitivity Labels in New Outlook After Switching From Classic Outlook

When you switch from Classic Outlook to the new Outlook for Windows, your sensitivity labels may not appear immediately in the ribbon or the email compose window. This happens because the new Outlook client uses a different mechanism to load Microsoft Purview Information Protection settings. In this article, you will learn how to enable sensitivity labels in the new Outlook, what prerequisites are required, and how to fix common issues where labels remain hidden or grayed out.

Why Sensitivity Labels Are Missing in New Outlook

Classic Outlook loads sensitivity labels through the Azure Information Protection (AIP) add-in or built-in Microsoft 365 labeling. The new Outlook for Windows does not support legacy add-ins. Instead, it relies on the Microsoft Purview Information Protection framework integrated directly into the client. If you have not installed the Azure Information Protection unified labeling client, the new Outlook cannot display any sensitivity labels. Additionally, your Microsoft 365 admin must publish label policies to your user account or a security group you belong to. Without a published policy, the new Outlook shows an empty sensitivity label menu.

Another reason labels may be missing is that the new Outlook uses a separate profile and cache. When you switch from Classic Outlook, the new client does not automatically migrate your labeling settings. You must manually trigger the label policy download by restarting Outlook after installing the required client software.

Steps to Enable Sensitivity Labels in New Outlook

1. Verify your Microsoft 365 subscription
   Sensitivity labels are available only in Microsoft 365 Apps for Business, Business Premium, Enterprise E3, Enterprise E5, and Education plans. Open File > Account in Outlook and confirm your subscription type. If you have a Home or Personal plan, sensitivity labels are not supported.
2. Ask your admin to publish label policies
   Open a browser and navigate to the Microsoft Purview compliance portal at compliance.microsoft.com. Your admin must create sensitivity labels and publish them to a policy that includes your user account. After publishing, labels can take up to 24 hours to appear in clients. Ask your admin to confirm that the policy is assigned to you.
3. Download and install the Azure Information Protection unified labeling client
   Go to the Microsoft Download Center and search for “Azure Information Protection unified labeling client.” Download the executable named AzInfoProtection_UL.exe. Run the installer and follow the prompts. Accept the license terms and complete the installation. This client provides the label definitions that the new Outlook reads.
4. Restart Outlook completely
   Close all Outlook windows. Open Task Manager by pressing Ctrl+Shift+Escape and confirm that no Outlook.exe process is running. If you see Outlook.exe, select it and click End task. Open Outlook again. The sensitivity label button should now appear in the ribbon under the Home tab and in the email compose window.
5. Test a sensitivity label on a new email
   Click New Email in Outlook. In the message window, locate the Sensitivity button in the ribbon. Click it to see the list of published labels. Select a label such as “Confidential” or “Internal.” The label name appears above the subject line. Send the email to yourself to verify that the label is applied correctly.

Alternative Method: Enable Labels via Registry

If the sensitivity label button still does not appear, you can force the new Outlook to load labels by adding a registry key. This method is intended for advanced users and should be done only after the AIP client is installed.

1. Open Registry Editor
   Press Windows+R, type regedit, and press Enter. Click Yes if prompted by User Account Control.
2. Navigate to the Outlook key
   Go to HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Preferences. If the Preferences folder does not exist, right-click the Outlook key and select New > Key, then name it Preferences.
3. Create a DWORD value
   Right-click in the right pane and select New > DWORD (32-bit) Value. Name it EnableSensitivityLabel and set its value to 1. Click OK.
4. Restart Outlook
   Close and reopen Outlook. The sensitivity label button should now be active.

If Sensitivity Labels Still Do Not Appear

The Sensitivity button is grayed out in new Outlook

A grayed-out Sensitivity button usually means the label policy has not been downloaded. Verify that the Azure Information Protection unified labeling client is installed by checking Programs and Features in the Control Panel. Look for “Microsoft Azure Information Protection.” If it is missing, reinstall the client. Also confirm that your user account is assigned to a label policy in the Microsoft Purview compliance portal.

Sensitivity labels worked in Classic Outlook but not in new Outlook

Classic Outlook may have used a legacy add-in or a different labeling method. The new Outlook does not support the classic AIP add-in for Office. You must switch to the unified labeling client. Uninstall any older AIP add-in from Control Panel, then install the unified labeling client as described in the steps above.

Labels appear in Classic Outlook but not in new Outlook after switching

This is the most common scenario. The new Outlook uses a different profile that does not inherit label policies automatically. Follow the full step sequence: install the unified labeling client, restart Outlook, and verify that the label policy is published to your account. If labels still do not appear, sign out of Outlook and sign back in. Go to File > Account > Sign out, then close Outlook and reopen it to sign in again.

Sensitivity Labels in Classic Outlook vs New Outlook

Item	Classic Outlook	New Outlook
Add-in dependency	Requires AIP add-in for Office	Native Purview integration, no add-in needed
Label policy refresh	Automatic with Outlook restart	Requires AIP unified labeling client installed
Supported subscriptions	Business, Enterprise, Education	Same as Classic Outlook
Registry override available	Yes	Yes, EnableSensitivityLabel DWORD
Label visibility in compose	Shows in ribbon and info bar	Shows in ribbon and above subject line

You can now use sensitivity labels in the new Outlook to classify and protect your email messages. After completing the setup, try applying a label to a draft email and then inspecting the label properties by clicking the label name. For advanced protection, combine sensitivity labels with encryption rules defined in the Microsoft Purview compliance portal to restrict forwarding or printing of sensitive messages.