Remove-ADUser when object is a tree

Question

Hi,
I have a problem with some AD user objects.
If some AD users have ActiveSync device registered in Exchange, their user object is a "tree" object rather than a "leaf" object.
Therefore, when I try to delete such an AD user object, I get error below:
+ $users | % {Remove-ADUser -Identity $_.distinguishedname}
+             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (CN=John Doe...C=acme,DC=local:ADUser) [Remove-ADUser], ADException
    + FullyQualifiedErrorId : The directory service can perform the requested operation only on a leaf object,Microsoft.ActiveDirectory.Management.Comm
   ands.RemoveADUser
My only solution is to use GUI (dsa.msc) and delete users one by one from there. The GUI shows warning, but continuing on warning gets the job done. So, I have three questions.
1. How can I test if the object is a leaf?
2. How can I test if the object is a tree?
3. How can I delete AD user in Powershell when user object is a tree?
Thanks in advance,
Les

Answer 1

I'm not sure how to test for that.
I'd just use Remove-ADObject for removing all users or do something like this to cover all bases:
$user = Get-ADUser username
try {
Remove-ADUser -Identity $user.DistinguishedName -ErrorAction Stop
} catch {
Remove-ADObject -Identity $user.DistinguishedName -Recursive
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