How to view mail and proxy addresses in Active Directory

1. In the Active Directory Users and Computers window, click View from the toolbar.
2. From the View drop-down menu, click Advanced Features.

3. Double-click on a user to view the user Properties window.
4. In the Properties window, click the Attribute Editor tab.
5. To view the user's mail address, search the Attribute column for mail. Select mail and click the "Edit" button.

6. This will open the String Attribute Editor window. Here, you can adjust the Value of the mail Attribute.

7. To view the user's proxy address, search the Attribute column for proxyAddresses. Select mail and click the "Edit" button.

8. This will open the Multi-valued String Editor window. Here, you can add or remove a Value to the proxyAddresses Attribute.