Data Protection Issues

Fix Purview Sensitivity Labels Disabled for On-Premises Exchange

Bushra Parveen Oct 1, 2026 868 views

Question details

Users are unable to apply Purview Sensitivity labels because the option is disabled when sending emails from an on-premises Exchange account.

How to Fix Purview Sensitivity Labels Disabled for On-Premises Exchange in Outlook

Product: Microsoft Outlook
Device & OS: not provided
Scenario: Composing an email in Outlook using a profile that contains both Exchange Online and on-premises Exchange accounts.
Observed behavior: The Sensitivity button is disabled or unavailable in the Outlook ribbon when the on-premises Exchange account is selected in the 'From' field.

Before you start

Ensure that your Outlook client is updated to the latest version and verify with your IT administrator whether your organization's Purview labeling policies are configured to support on-premises environments.

Solution 1Recommended

Verify Account Context in the 'From' Field

Check if the Sensitivity button becomes available when switching to a natively supported Exchange Online account.

Purview sensitivity labeling support is highly dependent on the active account and client context. When using a mixed profile, the feature may disable itself for unsupported on-premises accounts.

Compose a new email

Open Microsoft Outlook and click on 'New Email' in the Home ribbon to open the message composition window.

Change the sending address

Click the 'From' dropdown menu located above the 'To' field.

Select the Exchange Online account

Choose your Exchange Online (Microsoft 365) account instead of the on-premises Exchange account.

Verify the Sensitivity button

Look at the Message ribbon to see if the Sensitivity button is now active and clickable.

Verify Account Context in the 'From' Field

Expected Behavior: If the button activates for the Exchange Online account but not the on-premises one, the behavior is expected due to the limitations of on-premises Exchange labeling integration.

Solution 2

Consult Exchange Server Management and Client Policies

Review server-side configurations and specific client registry settings if on-premises labeling is strictly required.

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Frequently Asked Questions

Why is the Sensitivity button greyed out in Outlook?

The Sensitivity button can be greyed out if your organization has not assigned labeling policies to your account, if your Office client requires an update, or if you are sending an email from an unsupported on-premises Exchange account within a mixed Outlook profile.

Does Microsoft Purview natively support on-premises Exchange environments?

Native support is limited. Implementing sensitivity labels for on-premises Exchange often requires specific architectural configurations, such as utilizing the Azure Information Protection scanner or deploying specialized client-side policies.

Will changing the UseOfficeForLabelling registry key fix the missing sensitivity labels?

Not always. Modifying client registry settings like UseOfficeForLabelling may not restore the labeling functionality if the underlying on-premises account context does not support Microsoft Purview sensitivity labels.

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