Applies to: Exchange Server 2013

This cmdlet is available only in on-premises Exchange Server 2013.

Use the Dismount-Database cmdlet to dismount a database on a computer running Microsoft Exchange Server 2013 that has the Mailbox server role installed. You can run this command only if the Microsoft Exchange Information Store service is running.

For information about the parameter sets in the Syntax section below, see Syntax.

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

This example dismounts the database MyDatabase.

Dismount-Database -Identity MyDatabase
Regardless of where you run this cmdlet, it operates against the server hosting the active copy of the database.

You need to be assigned permissions before you can run this cmdlet. Although all parameters for this cmdlet are listed in this topic, you may not have access to some parameters if they're not included in the permissions assigned to you. To see what permissions you need, see the "Mailbox databases" entry in the Recipients Permissions topic.


Parameter Required Type Description




The Identity parameter specifies the GUID or distinguished name (DN) that represents a specific database.




The Confirm switch 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 switch.




The DomainController parameter specifies the fully qualified domain name (FQDN) of the domain controller that writes this configuration change to Active Directory.




The WhatIf switch instructs the command to simulate the actions that it would take on the object. By using the WhatIf switch, 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 switch.

To see the input types that this cmdlet accepts, see Cmdlet Input and Output Types. If the Input Type field for a cmdlet is blank, the cmdlet doesn’t accept input data.

To see the return types, which are also known as output types, that this cmdlet accepts, see Cmdlet Input and Output Types. If the Output Type field is blank, the cmdlet doesn’t return data.