Mailboxes are the delivery location for all incoming mail messages for a designated owner. A mailbox can contain received messages, message attachments, folders, documents, and other files. Information in a user's mailbox is stored in a mailbox store on an Exchange server.
Each mailbox store must be associated with a default public store. You specify the public folder store when you create a mailbox store. The public folder store installed by default on each server contains the MAPI public folder hierarchy, which is the All Public Folders branch of the Public Folders tree. You can have only one MAPI public folder hierarchy in your Exchange organization and it is associated with only one default public folder store. If you have other servers in your installation, you can choose from their default public folder stores.
Related TopicsSingle Instance Message Storage