Enable AUTO Out-Of-Office (OOO) message reply

I am trying to Enable AUTO Out-Of-Office (OOO) message reply  for disabled active directory users that own a mailbox in case the employee is terminated or quits.

I have the following powershell scripts to process output of Exchange 2010 PowerShell cmdlets from within a Quest One Identity Manager (Q1IM) process:

Dim theScript As New StringBuilder()

theScript.AppendLine("Get-ADUser  -Filter {Enabled -eq $false}  -Searchbase 'ou=Disabled Accounts ,Dc=tmglab,DC=local' |" )

theScript.AppendLine("ForEach{")

theScript.AppendLine("Set-MailboxAutoReplyConfiguration -Identity $_")

theScript.AppendLine("-AutoReplyState Enabled")

theScript.AppendLine("-ExternalAudience All")

theScript.AppendLine("-InternalMessage 'Your message to internal users'")

theScript.AppendLine("-ExternalMessage 'Your message to external users'")

theScript.AppendLine("}")

Value = theScript.ToString()

I embeded the script to the VI_EX2K10_ADSAccount_Hide_Mailobject process. But the process doesnt seem working when I send email to the disabled ADS account.

Does anyone out there have any thoughts on how to best accomplish this? Please advise.