Script to disable users and export their files and email...

Hey Scripting Guys...

I have a script that I wrote for terminating users.  It disables the user, stamps the account with the time and date, removes them from all their AD Groups, exports their email to a .PST and compresses their user folders to a .zip file along with a few other things.  The script works.  With a hitch.  I get an error after the script runs that looks like this:

WARNING: The cmdlet extension agent with the index 5 has thrown an exception in
 OnComplete(). The exception is: System.InvalidOperationException: Operation is
 not valid due to the current state of the object.
   at
Microsoft.Exchange.Data.Storage.ExchangePrincipal.get_ServerFullyQualifiedDomai
nName()
   at Microsoft.Exchange.Data.Storage.MailboxSession.Initialize(MapiStore
linkedStore, LogonType logonType, ExchangePrincipal owner, DelegateLogonUser
delegateUser, Object identity, OpenMailboxSessionFlags flags, GenericIdentity
auxiliaryIdentity)
   at
Microsoft.Exchange.Data.Storage.MailboxSession.<>c__DisplayClass12.<CreateMailb
oxSession>b__10(MailboxSession mailboxSession)
   at
Microsoft.Exchange.Data.Storage.MailboxSession.InternalCreateMailboxSession(Log
onType logonType, ExchangePrincipal owner, CultureInfo cultureInfo, String
clientInfoString, IAccountingObject budget, Action`1 initializeMailboxSession,
InitializeMailboxSessionFailure initializeMailboxSessionFailure)
   at
Microsoft.Exchange.Data.Storage.MailboxSession.CreateMailboxSession(LogonType
logonType, ExchangePrincipal owner, DelegateLogonUser delegateUser, Object
identity, OpenMailboxSessionFlags flags, CultureInfo cultureInfo, String
clientInfoString, PropertyDefinition[] mailboxProperties, IList`1
foldersToInit, GenericIdentity auxiliaryIdentity, IAccountingObject budget)
   at
Microsoft.Exchange.Data.Storage.MailboxSession.ConfigurableOpen(ExchangePrincip
al mailbox, MailboxAccessInfo accessInfo, CultureInfo cultureInfo, String
clientInfoString, LogonType logonType, PropertyDefinition[] mailboxProperties,
InitializationFlags initFlags, IList`1 foldersToInit, IAccountingObject
budget)
   at
Microsoft.Exchange.Data.Storage.MailboxSession.OpenAsSystemService(ExchangePrin
cipal mailboxOwner, CultureInfo cultureInfo, String clientInfoString)
   at
Microsoft.Exchange.ProvisioningAgent.MailboxLoggerFactory.XsoMailer.Log(AdminLo
gMessageData data, LogMessageDelegate logMessage)
   at
Microsoft.Exchange.ProvisioningAgent.AdminLogProvisioningHandler.OnComplete(Boo
lean succeeded, Exception e)
   at Microsoft.Exchange.Provisioning.ProvisioningLayer.OnComplete(Task task,
Boolean succeeded, Exception exception)

My script looks like this:

#Created by Rob Smura 2/7/2013
#Updated 8/5/2013 to use 7-Zip instead of .zip
#Updated 3/5/2013 to add Disabled date to description, move the user to Retired Users OU and forward email of user to someone.
#This script must be run in an Exchange Management PowerShell or on a machine with the Exchange Management Tools installed.
#The script will prompt for username to be disabled, their firstname.lastname and a forward email to: username


add-pssnapin Microsoft.Exchange.Management.PowerShell.E2010
Import-Module ActiveDirectory
$UserName = $null
$UserFullName = $null
$ForwardMail = $null
$UserName = read-host -Prompt "Enter the username"
$UserFullName = read-host -Prompt "Enter FirstName.LastName"
$ForwardMail = Read-Host -Prompt "Enter the username to forward the user's mail to"
$ExportFilePath="\\KBackR\Former Users"
$FileServerPath="\\KleinDB\user"

#Creates folder to store Files and .PST in
$FormerUserStoragePath = "$ExportFilePath\$UserFullName"
if(!(Test-Path $FormerUserStoragePath))
	{
	[void](New-Item -path $ExportFilePath -name $UserFullName -type directory)
	}


#Remove User from all existing group memberships
# Retreive group membership of $Username
$SourceUser = Get-ADUser $UserName -Properties memberOf
# Enumerate direct group memberships
ForEach ($SourceDN In $SourceUser.memberOf)
{
	# Remove the target user from this group and don't bother asking for confirmation.
	Remove-ADGroupMember -Identity $SourceDN -Members $UserName -Confirm:$false
}

#Diable user
Set-ADUser $UserName -enabled $false

#Change Description of user to 'Disabled and today's date stamp'
$DateStamp = Get-Date -DisplayHint Date
Set-ADUser $UserName -Replace @{description="User Disabled: " + $DateStamp}

#Hide user from GlobalAddressLists
Get-Mailbox $UserName | Set-Mailbox -HiddenFromAddressListsEnabled $true

#Move user to Retired Users OU
Get-ADUser $UserName| Move-ADObject -TargetPath 'OU=Retired Users,DC=Kleinsteel,DC=com'


#Exports mailbox to .PST
$PSTFileName = "$ExportFilePath\$UserFullName\$UserFullName.pst"

If (Test-Path $PSTFileName)
	{
	$OldPSTFileName = "$PSTFileName" + ".old"
	If (Test-Path $OldPSTFileName)
		{
		Remove-Item -path $OldPSTFileName
		}
	Rename-Item -path ("$PSTFilename") -NewName ("$PSTFileName.old")
	}
#Forwards email to the $ForwardingAddress if it's not $null.
If ($ForwardMail -ne "'r")
{
	Set-Mailbox -Identity ("$UserName") -ForwardingAddress "$ForwardMail@kleinsteel.com"
}
else{}#Do Nothing

#Export mailbox to .PST
New-MailboxExportRequest -mailbox ("$UserName@kleinsteel.com") -filepath "$ExportFilePath\$UserFullName\$UserFullName.pst"

#Uses 7-Zip to compress the user's folders and place them in the same location as the mail archive.
try{
Set-alias sz "$env:ProgramFiles\7-Zip\7z.exe"
if (-not (test-path "$env:ProgramFiles\7-Zip\7z.exe" )) { #Check if 7zip exist in the machine
throw ("$env:ProgramFiles\7-Zip\7z.exe needed.  Run the command 7z.exe a -mx9 -mmt=on $ExportFilePath\$UserFullName.7z $FileServerPath\UserFullName")
}
try{
Write-Host "Compressing using 7zip"
sz a -mx9 -mmt=on $ExportFilePath\$UserFullName\$UserFullName.7z $FileServerPath\$UserName
}
catch{
throw ("Error during the archive operation")
}
}
catch{
throw( $error[0])
}
Write-Host -ForegroundColor green "Folders successfully compressed"


#This line removes the completed mailbox export request.  If it fails, run just this Get-MailboxExportRequest line again.
Get-MailBoxExportRequest #Show the existing Export Requests
Get-MailboxExportRequest | where {$_.status -eq "Completed"} | Remove-MailBoxExportRequest #Remove the completed Export Requests if there are any
Remove-pssnapin Microsoft.Exchange.Management.PowerShell.E2010
Remove-Module ActiveDirectory
$AnyKey = read-host -Prompt "Press any key to continue..." #Just a pause to keep the powershell window from closing so you can view msgs / errors.