Overview of Creating and Managing Mailbox Databases

          Exchange Server 2013 comes with one
mailbox database that is created by default. It is
located on a system drive, and it provides initial
storage for the administrator mailbox and system
mailboxes.
          Sometime we will not use the default mailbox database unless you have a small and low demand environment. Or you can create a new mailbox database on the supported storage. For recommendation, do not remove the
default mailbox database, because it contains system mailboxes but you can rename as you can note.
          You can create a mailbox database from both the Exchange Administration Center (EAC) or from the Exchange Management Shell. However, advanced management of existing databases can be done only from the Exchange Management Shell.
When you create a mailbox database from the EAC, you need to specify the mailbox database name, the server that will host the database, and paths for the database file and logs. By default, each database location is within the Exchange Server installation directory, but we recommend that you change this because you should host the databases on a dedicated volume.
          On the properties of the mailbox database in the EAC, you can configure options on the following tabs:
• General: Used to configure only the database name. All other settings and properties are read only,
but you can see when the last backup of the database was performed, on which server the database is mounted, and who the master server is for the database. You can also see the last modification date.
• Maintenance: Used to configure the journal recipient for the database and the maintenance schedule. You can also enable background database maintenance, and configure circular logging. For
restore purposes, you can enable overwrite on the database, and configure the database so that it
does not mount on startup.
• Limits: Used to configure mailbox size and retention limits. You can configure limits where clients will be warned to the size of their mailboxes and also limits when send and receive will be prohibited. For retention, you can configure how many days the system will keep deleted items and mailboxes.
• Client Settings: Used to configure Offline Address Book (OAB) for the users on a mailbox database by database basis.