Active Roles does not support creation of Exchange 2003 mailboxes

I have a script which creates User Mailbox or if this mailbox isnt used for active sync a shared mailbox but i get this error

• Administrative Policy returned an error. Exchange Server-related operation failed. Active Roles does not support creation of Exchange 2003 mailboxes. You can use Active Roles to create mailboxes of version Exchange 2007 or later.

Is there an Option to control the mailbox version? 

$attCreateUserMailbox = "edsaCreateMsExchMailbox"
$attCreateSharedMailbox = "edsva-MsExch-CreateSharedMailbox"

if ($ActiveSync)
{
	$Request.PutEx($Constants.ADS_PROPERTY_UPDATE, $attAccountIsDisabled, @($false))
	$Request.PutEx($Constants.ADS_PROPERTY_UPDATE, $attCreateUserMailbox, @($true))
}
else
{
	$Request.PutEx($Constants.ADS_PROPERTY_UPDATE, $attAccountIsDisabled, @($true))
	$Request.PutEx($Constants.ADS_PROPERTY_UPDATE, $attCreateSharedMailbox, @($true))
}