Exchange Account Deletion also deletes AD account

[Guest]

My company has recently been consumed by another from an AD standpoint. I
have been questioning the deletion of user accounts from our "self-managed"
OU by an automated process and I am being told that the deletion of Exchange
5.5 mailboxes (that still live in my old domain) is causing the deletion of
AD accounts across the Active Directory Connector. I am also being told that
to not do this would cause instability in the Exchange environment. I need
to know if this is true and why.

 

[Ryan Hanisco]

This is not a real issue of stability, but rather exposure to hacking and
security violations. You should do a search of the AD for users that have
not been logged in in 3-6 months and kill those. Other than that, you need
to maintain the accounts in use or migrate them into the parent domain with
ADMTv2.

 

[Guest]

More information to clarify: User accounts have been migrated from my domain
into the corp domain. Mailboxes still live on Exchange server in my domain.
Our Account management process is once someone resigns, to delete the mailbox
in Exchange after ExMerging it to a PST file and disable the user account for
30 days. What corp is telling us is that the deletion of the mailbox is what
is triggering the deletion of the user account. This is being done
purposefully using the Active Directory Connector and corp is saying that not
deleting the accounts in AD would cause instability in email.