Brian Desmond .http://briandesmond.com/blog/archive/2005/10/19/13474.aspx"
had a great article about a potentially bad situation that can
arise from a poorly designed feature in Exchange System Manager. In KB article
http://support.microsoft.com/?kbid=841516 it talks about how if you choose the delete option by right clicking a server under the system policies section, it doesn't just delete the server from the server policy but also deletes the actual server object from AD. I cannot imagine why MS chose to even allow this but it's there and you should be aware of it.
The KB goes thru the steps to recover the object, needless to say it's alot of
work. BTW, the delete option is only seen if your running Exchange 2003 native
Hopefully MS will correct this in a future sp/hotfix