With the release of Enterprise Vault 10.0.4 yesterday came a small, but important, caveat around the server operating systems which are currently supported. At the moment Enterprise Vault is not supported to be running on Windows Server 2012. That particular Operating System looks to have a had a few hiccups when used inconjuction with Enterprise Vault, as described in the technote below:
My advice would be to subscribe to the technote and wait and see what the outcome is on the points raised.