Thanks Todd. This would mean deploying a new AD server, something which we have no experience of, and it would cost us. O don't suppose there's any chance we could use Apple's Open Directory? Are there any third party plugin's around for this?
We support OpenLDAP and Active Directory, but NOT Apple's Open Directory. For OpenLDAP, please see the following knowledge base article: http://www.kb.open-e.com/entry/852/