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The mailbox server holds the Exchange Store, which provides a single repository for managing multiple types of unstructured information in one infrastructure. The store hasn’t changed much since Exchange Server 2003 but has been further improved and, of course, contains multiple new features. The Exchange Store is still made up of multiple interacting logical components, where the primary three still are storage groups, mailbox databases (formerly known as mailbox stores), and Public Folder databases (formerly known as Public Folder stores).
Note
Back in Exchange 2000 and 2003, the databases containing either mailboxes or Public Folders were known as mailbox stores and Public Folder stores, respectively, but with Exchange Server 2007 they are now referred to as mailbox databases and Public Folder databases.