Powershell - Create User Mailboxes and Apply a Address Book Policy and remove Email Alias.

Hi all,

Please excuse my ignorance, i'm haven't done a lot with powershell.

I have a roughly 300 user accounts in AD and need to create their mailboxes in exchange.  

I would like to create a mailboxes for each user in the OU, assign X address book policy and remove their secondary @internal email alias on their account. This is what i have come up with, am i on the right track?

Import-module activedirectory 
 
$users = Get-ADUser -LDAPfilter '(name=*)' -searchBase {DC=Staff,DC=Users,DC=DOMAIN,DC=INTERNAL.DOMAIN.TAS.EDU.AU}  
 
foreach($user in $users)  
{  
Enable-Mailbox -Identity $user.SamAccountName -Database <DBName>  
Update-EmailAddressPolicy -Identity "Staff Only Policy"  
}

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TIA,
Patrick.