ADMT Child Leaf Objects Error
When using the Active Directory Migration Toolkit, you may receive an error that a user cannot be moved while they have child leaf objects. This is usually due to the user tying a device to their Exchange account via ActiveSync.
To solve this, make sure you have the Support Tools for Windows Server installed. Open up ADSI Edit (adsiedit.msc), and browse out to the user object.
Under the user container will be another container, ExchangeActiveSyncDevices. Select it, and you’ll see a list of all associated phones for the user on the right pane.
Delete the phones one at a time (right-click, Delete). Once all the phone objects have been deleted, you can then delete the ExchangeActiveSyncDevices container.
Once this is done, you should have no more problems moving the user with ADMT.