The format for the users' Mail Alias and Display Name can be modified from here. You can also select whether to hide the alias from the Exchange Server address list or not.
First, choose the desired format for the user's Alias and Simple Display name, then decide if the users will be hidden from the "Exchange address list" and finally click Apply button.
Select the AD Mgmt tab.
Click the Naming Attributes link available under Exchange Attributes. This opens the Modify Exchange Naming Attributes of the Users dialog.
Select the mail alias format for the users. You can also create your own format. Know more about Naming format here ( paste link)
Select the desired Simple Display Name format for the users
Select whether to hide the alias from the Exchange Server address list or not.
You can now use one of the following options to list the contacts whose group attributes have to be modified
a) You can import the CSV file (sample CSV file) which contains the list of users. After importing the CSV file, from the drop down menu (on the right hand side), select the attribute based on which you want to display the user objects.
b) Use the Search option to find the users (Note: To list all the users, just click the Search button without typing anything in the Search box)
7. Now, use the check box to select the desired list of user (s) and then click Apply
The change summary and the status of the modification can be verified.
Roll over the mouse over the icon to see the attributes in the windows native UI.