As there is no CAS Arrays in Exchange 2013 the Autodiscover Service receives the following information to locate the users mailbox server “user’s mailbox GUID + @ + the domain portion of the user’s primary SMTP address”

The Autodiscover Service also provides the following information

  • The user’s display name
  • Separate connection settings for internal and external connectivity
  • The URLs for various Outlook features that govern functionality such as free/busy information, Unified Messaging, and the offline address book
  • Outlook Anywhere server settings

When a user’s Exchange information is changed, Outlook automatically reconfigures the user’s profile using the Autodiscover service. For example, if a user’s mailbox is moved or the client can’t connect to the user’s mailbox or to available Exchange features, Outlook will contact the Autodiscover service and automatically update the user’s profile to include the information that’s required to connect to the mailbox and Exchange features.

Clients on the LAN still use SCP to locate the Autodiscover Service where as external clients ( clients disconnected from LAN) or non-domain joined clients still use @smtp-address.x

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