Applies to: Exchange Server 2013

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

Use the Remove-DatabaseAvailabilityGroupServer cmdlet to remove a Mailbox server from a database availability group (DAG). To remove a Mailbox server from a DAG, the Mailbox server must not host any replicated databases.

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

Remove-DatabaseAvailabilityGroupServer -Identity <DatabaseAvailabilityGroupIdParameter> -MailboxServer <ServerIdParameter> [-ConfigurationOnly <SwitchParameter>] [-Confirm [<SwitchParameter>]] [-DomainController <Fqdn>] [-SkipDagValidation <SwitchParameter>] [-WhatIf [<SwitchParameter>]]

This example removes the Mailbox server MBX1 from the DAG DAG3.

Remove-DatabaseAvailabilityGroupServer -Identity DAG3 -MailboxServer MBX1

This example removes the configuration settings for the Mailbox server MBX4 from the DAG DAG2. MBX4 is currently offline and expected to be offline for an extended period, so its configuration is being removed from the DAG to establish quorum for the DAG or to reduce the number of members needed for quorum by the DAG.

Remove-DatabaseAvailabilityGroupServer -Identity DAG2 -MailboxServer MBX4 -ConfigurationOnly

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 "Database availability groups" entry in the High availability and site resilience permissions topic.


Parameter Required Type Description




The Identity parameter specifies the name of the DAG from which you're removing the server.




The MailboxServer parameter specifies the name of the Mailbox server being removed from the DAG.




The ConfigurationOnly switch should only be used if the Mailbox server has been lost and can no longer be contacted, or in situations when the Mailbox server can't be restored to operational service before the messaging service is needed. When used, it removes the Mailbox server from the DAG object in Active Directory. If the Mailbox server is offline but the DAG has quorum, the Mailbox server is evicted from the DAG's cluster and removed from the DAG object in Active Directory.




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 SkipDagValidation switch specifies whether to bypass the validation of the DAG's quorum model and the health check on the DAG's witness when removing members from the DAG.




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.