Powershell script to disconnect Exchange 2003 mailboxes not working

I'm using a script that I found at PowerGui.org website but I'm running into problems. I tested the script in a test environment with Exchange 2003 installed on the DC, and the script worked just fine. However, when I run the script from my Win7 machine in my production network to delete mailboxes on my Exchange 2003, I run into problems saying that there was a problem with the "deletemailbox" method. Any idea what I'm missing? I'm including the script and a snapshot of the error message.

http://www.powergui.org/thread.jspa?messageID=33010

$strDCName = "SERVER1"

Import-Csv "c:\myfile.csv" | `
ForEach {
	#$dn = (Get-QADUser -identity $Username | Select-Object dn).dn
	$today = $(Get-Date).ToShortDateString()
	$name = $_.DisplayName
	$dn = (Get-QADUser -Identity $_.NTAccountName | Select-Object DN).dn
	$homeMDB = (Get-QADUser -Identity $_.NTAccountName -IncludedProperties homeMDB | Select-Object homeMDB).homeMDB
	
	$user = [adsi]("LDAP://$strDCName/$dn")

	if ($homeMDB -eq $null) {
		Write-Host "User does not have a mailbox"
		}

	else {
		$user.DeleteMailbox()
		$user.Description = "Disconnected mailbox via script, $today"
		$user.SetInfo()
		Write-Host "Deleted mailbox for $name"
		}
}

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error-disconnecting-mailbox.png