Each mailbox has an Exchange alias and display name associated with it. The Exchange alias is used with address lists as an alternative way of specifying the user in the To, Cc, or Bcc text boxes of an e-mail message. The alias also sets the primary SMTP address associated with the account.
Whenever you change the Exchange alias, a new e-mail address can be generated and set as the default address for SMTP. The previous e-mail addresses for the account aren’t deleted. Instead, these remain as alternatives to the defaults.
To change the Exchange alias and mailbox name on a user account:1.
In Exchange Management Console, expand the Recipient Configuration node and then select the related Mailbox node.2.
Double-click the mailbox entry for the user with which you want to work.3.
On the General tab, the first text box sets the mailbox name. Change this text box if you’d like the mailbox to have a different display name.4.
The Alias text box sets the Exchange alias. If you’d like to assign a new alias, enter the new Exchange alias in this text box. Click OK.