While deleting a few disabled user accounts today I came across a warning message I’ve not encountered before.
I was only deleting a user account and had already deleted a number of them so what was different about this one?
In ADUC, I selected View – Users, Contacts, Groups and Computers as containers.
I was then able to drill down into the user and see what other objects they contained. It turns out that there was an iPhone listed in the ExchangeActiveSyncDevices for the users.
So, knowing what i was deleting, it was safe to proceed.