The Exchange store has several logical components which are residing on a single server, or distributed across multiple servers. The primary components of the Exchange store are:
•Storage groups (including recovery storage groups)
•Public folder databases
An Exchange storage group is a logical container for Exchange databases and their associated system and transaction log files. All databases in a storage group share a single backup schedule and a single set of transaction log files.
Exchange Server 2007 Enterprise Edition supports up to 50 storage groups. Exchange 2007 Standard Edition supports up to five storage groups.
Recovery Storage Groups
A recovery storage group (RSG) is a special administrative storage group that allows you to mount mailbox databases and extract data from those databases. RSGs also allow you to recover data from a backup or copy of a database without disturbing user access to current data.In Exchange 2007, RSGs are created and managed by using the Exchange Management Shell or by using the Microsoft Exchange Server Disaster Recovery Analyzer Tool.
You cannot manage RSGs by using the Exchange Management Console, and RSGs are also not visible in the Exchange Management Console.
Mailbox databases contain the data, data definitions, indexes, checksums, flags, and other information that comprise mailboxes in Exchange 2007. Mailbox databases hold data that is private to an individual user and contain mailbox folders that are generated when a new mailbox is created for that user. A mailbox database is stored as an Exchange database (.edb) file.
Exchange 2007 Enterprise Edition supports a total of 50 databases. Exchange 2007 Standard Edition supports a total of five databases. Both editions support a maximum of five databases per storage group, and all five databases can be mailbox databases.
Public Folder Databases
Public folder databases contain the data, data definitions, indexes, checksums, flags, and other information that comprise any public folders in your Exchange organization. Both editions of Exchange 2007 support only one public folder database per server. In Exchange 2007, you manage public folders by using the Exchange Management Shell. (You can also perform a limited number of public folder database management tasks in the Exchange Management Console.)