AD / LDAP Synchronizer not deleting users(?)

[Plainside]

"When the customer deletes users from their Active Directory should it be deleted from the MiCollab Client Service Configuration?"

This is a discussion we had in house several times but never got answered.
New users are imported / created by the "AD / LDAP Synchronizer" (Found under the MiCollab Client Services Configuration) however it doesn't remove them when deleted from the AD and syncing the system.
We've confirmed that they don't just disable the accounts (which the LDAP doesn't look at I believe(the accounts that are disabled)) and actually delete them from the AD.
Is it at all possible for the LDAP Sync to delete the old users?

They problem they are running into is that new users don't get imported / created by the sync, at which point they call us and we find out it still exists as a user.

[VinceWhirlwind]

They should Disable the AD accounts for a period.
Once disabled, the next LDAP sync from the MiCollab and the user will appear in the IDS detained list as a "D" record which you select and save which de-provisions them from the phone system.