DMitriy
AD ничего не сортирует. Это LDAP-сервер, он отвечает на запрос клиента
When Outlook wants to make an Autodiscover query, it first contacts Active Directory (AD) looking for all SCP (Service Connection Point) objects. Every time a new Exchange server is installed, it is going to create a new SCP object that contains two pieces of information, the serviceBindingInformation attribute and the keywords attribute. The serviceBindingInformation attribute is a URL that points to either the Exchange server that created the SCP object or what URL is set using the Set-ClientAccessService command with the –AutoDiscoverServiceInternalUri attribute. The keywords attribute is a list of AD Sites that the SCP object is authoritative for. After Outlook obtains and enumerates the instances of the Autodiscover service, the client connects to the first Client Access service in the enumerated and sorted list that has a keywords match to its own site. If Outlook can’t find its own site in the list of SCP objects keywords attributes, it will use the newest SCP object created. Which just happens to be the SCP object of that shiny new Exchange server you just installed.