Mailboxes Associated with Disabled Users

#This script is for getting a list of disabled users that still have mailboxes
#Execute the script with the following command
#.\DisabledUserMailboxes.ps1 -Output C:\DisabledUserMailboxes.csv
 
param(
     [string]$Output = $(Throw "You need to specify the output file name using -output")
)
 
# Get a list of users with disabled accounts, that are mail enabled
$domain = [ADSI]""
$searcher = new-object System.DirectoryServices.DirectorySearcher($domain)
$searcher.filter = "(&(userAccountControl:1.2.840.113556.1.4.803:=2)(homemdb=*))"
[Void]$Searcher.PropertiesToLoad.Add("distinguishedname")
$searcher.PageSize = 1000
$searcher.SearchScope = "Subtree"
$results = $searcher.findall()
 
write-host "$($results.count) Disabled Users are mail enabled"
 
# Create an empty array for storing the user data
$users = @()
 
#Enumerate through the disabled users and make sure they are user mailboxes, placing valid objects into the $users array
foreach($result in $results) {
     $MailboxExists = $null
 
     #Verify the user has a mailbox that is a user mailbox, not a Room, Equipment, Shared, etc mailbox
    $MailboxExists = Get-Mailbox $($result.Properties.distinguishedname).tostring() | Where-Object {($_.recipienttypedetails -eq "UserMailbox")}
 
    # Make sure the result is neither an emtpy string nor a null value, if not add the current user to the list of disabled mailbox users
    if (($MailboxExists -ne "") -and ($MailboxExists -ne $null)){
        write-debug $($result.Properties.distinguishedname)
        $users += $($result.Properties.distinguishedname).tostring()
    }
 
}
 
# Export the list of disabled users that have Exchange mailboxes to a CSV file
$users | select-object @{Name="DistinguishedName";Expression={$_}} | Export-Csv -Path $Output -Force -NoTypeInformation