In Outlook 2010 and Outlook 2007, Autodiscover automatically loads any mailbox for which a user has been granted FULL access permission. Users can’t control or disable this behavior.

• Calendar Repair Assistant supports more scenarios than were available in Exchange 2010 RTM.
• Mailbox Assistants are now all throttle-based (changed from time-based in Exchange 2010 RTM).
• Internet calendar PUBLISHING allows users in your Exchange organization to share their Outlook calendars with a broad Internet audience.
• IMPORTING and exporting .pst files now uses the Mailbox Replication service and doesn't require Outlook.
• Hierarchical address book support allows you to create and configure your address lists and offline address BOOKS in a hierarchical view.
• Distribution group naming policies allow you to configure string text that will be appended or prepended to a distribution group's name when it's created.
• Soft-delete of mailboxes after move completion

In Outlook 2010 and Outlook 2007, Autodiscover automatically loads any mailbox for which a user has been granted full access permission. Users can’t control or disable this behavior.