Exchange 2013 SP1 displaying users that no longer exist

Question

I'm currently in the process of migrating my Exchange 2010 SP3 environment over to 2013 SP1 and am hoping someone can give me a hand with an issue I'm having in Exchange 2013.  After installation of 2013 with no errors returned, when I log in to the
admin console I'm seeing users that have been deleted from my AD for quite some time with a mailbox type of "Legacy".  I've searched high and low to find these accounts and cannot find them anywhere.  I've searched through ADSI Edit and
LDP and nothing.  If I click on any of these users and choose to edit I get this error message:
The operation couldn't be performed because object 'GUID' couldn't be found on 'domain controller'.
The odd thing to me is that these "Legacy" users are nowhere to be found on my Exchange 2010 server.
Anyone have any other ideas of how and where I may be able to find these users?

Answer 1

Below powershell script can help you find out the lingering objects in your AD.
$myForest = [System.DirectoryServices.ActiveDirectory.Forest]::GetCurrentForest()
$dclist = $myforest.Sites | % { $_.Servers } |% { $_.Name }
$dcs_guid = get-qadobject -searchroot 'CN=Sites,CN=Configuration,DC=domain,DC=root' -Type nTDSDSA -IncludedProperties guid,dn -DontUseDefaultIncludedProperties | % {@{GUID=$_.guid;DN=$_.dn}}
foreach ($dcforestname in $dclist){
    foreach ($dc_src_guid in $dcs_guid){
        $hostname = ((($dc_src_guid.DN).split(',')[1]).split('=')[1]).tostring()
        $dcfqdn = $dclist -like "$hostname*" | Out-String -Stream
        $dclist_arr = ($dcfqdn).split(".")
        $dcname = $dclist_arr[0]
        $dcdomain = $dclist_arr[1 .. ($dclist_arr.count-1)]
        $domain_dn = ""
        for ($x = 0; $x -lt $dcdomain.Length ; $x++){
            if ($x -eq ($dcdomain.Length - 1)){$Separator = ""}else{$Separator =","}
            [string]$domain_dn += "DC=" + $dcdomain[$x] + $Separator
        write-Host "repadmin /removelingeringobjects $dcforestname" $dc_src_guid.GUID $domain_dn "/advisory_mode >> lingering_debug.log"
Regards, Riaz Javed Butt Consultant Microsoft Professional Services MCITP, MCITP (Exchange), MCSE: Messaging, MCITP Office 365