Disable POP by default

This will disabled POP on New accounts Only.

You will have to disable POP on all Existing accounts.

create this File:
C:\Program Files\Microsoft\Exchange Server\V14\Bin\CmdletExtensionAgents\ScriptingAgentConfig.xml

Put this in the File


<?xml version="1.0" encoding="utf-8" ?>  
<Configuration version="1.0">  
  <Feature Name="MailboxProvisioning" Cmdlets="enable-mailbox">  
    <ApiCall Name="OnComplete">  
      if($succeeded)  
        {  
        $user = (Get-User $provisioningHandler.UserSpecifiedParameters["Identity"]).distinguishedName  
        Set-CASMailbox $user -PopEnabled $false 
        }  
      </ApiCall>  
    </Feature> 
  <Feature Name="MailboxProvisioning" Cmdlets="new-mailbox">  
    <ApiCall Name="OnComplete">  
      if($succeeded)  
        {  
        $user = (Get-User $provisioningHandler.UserSpecifiedParameters["Name"]).distinguishedName  
        Set-CASMailbox $user -PopEnabled $false 
        }  
      </ApiCall>  
    </Feature>
</Configuration>

Run this Command

Enable-CmdletExtensionAgent "Scripting Agent"