I was trying to update an old line in our PowerShell script to create an exchange mailbox for users with no mailbox Here's what I have so far: The goal is to: 1. Create Mailbox for all ADusers with No mailbox in a specific OU 2. Add A CustomAttribute in Attribute9 3. Disable IMAP and POP Get-User -OrganizationalUnit Our UserOU -RecipentTypeDetails User | Enable-Mailbox -database “Your Database” | Set-Mailbox -CustomAttribute9 OurAttribute | Set-CASMailbox –PopEnabled $False –IMAPEnabled $False Any help you provide would be extremely appreciated.