• A UM dial plan has been created. For detailed steps, see Create a UM Dial Plan.
  
  
• A UM mailbox policy has been created. For detailed steps, see Create a UM Mailbox Policy.
  
  
• The user's mailbox has been UM-enabled. For detailed steps, see Enable a User for Unified Messaging.
  
  

You need to be assigned permissions before you can perform this procedure. To see what permissions you need, see the "UM mailboxes" entry in the Unified Messaging Permissions topic.

1. In the console tree, navigate to Recipient Configuration > Mailbox.
   
   
2. In the result pane, select the mailbox for which you want to remove an extension number.
   
   
3. In the action pane, under the mailbox name, click Properties.
   
   
4. In <Mailbox User> Properties, click the E-Mail Addresses tab.
   
   
5. To remove an existing EUM proxy address, select the EUM proxy address, and then click .
   
   
6. Click Apply, and then click OK.
   
   

You need to be assigned permissions before you can perform this procedure. To see what permissions you need, see the "UM mailboxes" entry in the Unified Messaging Permissions topic.

This example removes the extension number 12345 from the mailbox of Tony Smith, a UM-enabled user.

	Copy Code
$mbx = Get-Mailbox tony.smith $mbx.EmailAddresses.Item(1) -="eum:12345;phone-context=MyDialPlan.contoso.com" Set-Mailbox tony.smith -EmailAddresses $mbx.EmailAddresses

For more information about syntax and parameters, see Set-Mailbox or Get-Mailbox.

After you remove the extension number, you may also want to:

• Add an Extension Number for a UM-Enabled User
  
  
• Modify an Extension Number for a UM-Enabled User