Applies to: Exchange Server 2007 SP1, Exchange Server 2007 SP2, Exchange Server 2007 SP3

Topic Last Modified: 2015-03-09

Use the Dismount-Database cmdlet to dismount a database in a storage group on an Microsoft Exchange Server 2007 mailbox server. You can run this command only if the Microsoft Exchange Information Store service is running.

dismount-Database -Identity <DatabaseIdParameter> [-Confirm [<SwitchParameter>]] [-DomainController <Fqdn>] [-WhatIf [<SwitchParameter>]]

To run the Dismount-Database cmdlet, the account you use must be delegated the following:

  • Exchange Server Administrator role and local Administrators group for the target server

For more information about permissions, delegating roles, and the rights that are required to administer Exchange Server 2007, see Permission Considerations.


Parameter Required Type Description




Use the Identity parameter to specify the GUID or distinguished name that represents a specific database. You can also include the server name by using the format ServerName\StorageGroup. The "Identity" parameter label is optional.




The Confirm parameter causes the command to pause processing and requires you to acknowledge what the command will do before processing continues. You don't have to specify a value with the Confirm parameter.




To specify the fully qualified domain name of the domain controller that writes this configuration change to Active Directory, include the DomainController parameter on the command.




The WhatIf parameter instructs the command to simulate the actions that it would take on the object. By using the WhatIf parameter, you can view what changes would occur without having to apply any of those changes. You don't have to specify a value with the WhatIf parameter.


Error Description



Exceptions Description


In this example, the Dismount-Database command is used to dismount the database named "MyDatabase."

Dismount-Database -Identity ExchangeServer1.Contoso.com\MyDatabase

This command will not execute if the mailbox database contains user mailboxes.