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Applies to: Exchange Server 2013, Exchange Online

Topic Last Modified: 2014-05-19

This cmdlet is available in on-premises Exchange Server 2013 and in the cloud-based service. Some parameters and settings may be exclusive to one environment or the other.

Use the Add-MailboxPermission cmdlet to add permissions to a mailbox.

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

Add-MailboxPermission -Identity <MailboxIdParameter> -Owner <SecurityPrincipalIdParameter> <COMMON PARAMETERS>
Add-MailboxPermission -AccessRights <MailboxRights[]> -Identity <MailboxIdParameter> -User <SecurityPrincipalIdParameter> [-AutoMapping <$true | $false>] [-Deny <SwitchParameter>] [-InheritanceType <None | All | Descendents | SelfAndChildren | Children>] <COMMON PARAMETERS>
Add-MailboxPermission -Instance <MailboxAcePresentationObject> [-AccessRights <MailboxRights[]>] [-AutoMapping <$true | $false>] [-Deny <SwitchParameter>] [-Identity <MailboxIdParameter>] [-InheritanceType <None | All | Descendents | SelfAndChildren | Children>] [-User <SecurityPrincipalIdParameter>] <COMMON PARAMETERS>
COMMON PARAMETERS: [-Confirm [<SwitchParameter>]] [-DomainController <Fqdn>] [-IgnoreDefaultScope <SwitchParameter>] [-WhatIf [<SwitchParameter>]]

This example grants Kevin Kelly full access to Terry Adams’s mailbox.

The Identity parameter requires the full name of the user to be enclosed in quotation marks (").
Add-MailboxPermission -Identity "Terry Adams" -User KevinKelly -AccessRights FullAccess -InheritanceType All

This example sets Tony Smith as the owner of the resource mailbox Room 222.

Add-MailboxPermission -Identity "Room 222" -Owner "Tony Smith" 

This example grants the user Mark Steele Full Access permission to Jeroen Cool's mailbox and disables the auto-mapping feature.

Add-MailboxPermission -Identity JeroenC -User 'Mark Steele' -AccessRights FullAccess -InheritanceType All -AutoMapping $false

This example assigns full access permissions to all user mailboxes in an Exchange Online or Office 365 environment.

  1. Connect to Exchange Online by using remote PowerShell. For info about how to do this, go to the following Microsoft website:Connect to Exchange Online using remote PowerShell.

  2. Enter a command using the following syntax to assign full access permissions to all user mailboxes:

    Get-Mailbox -ResultSize unlimited -Filter {(RecipientTypeDetails -eq 'UserMailbox') -and (Alias -ne 'Admin')} | Add-MailboxPermission -User <user, role group or security group> -AccessRights fullaccess -InheritanceType all

    For example, to assign full access permissions to all user mailboxes for the administrator account admin@contoso.com, run the following command.

    Get-Mailbox -ResultSize unlimited -Filter {(RecipientTypeDetails -eq 'UserMailbox') -and (Alias -ne 'Admin')} | Add-MailboxPermission -User admin@contoso.com -AccessRights fullaccess -InheritanceType all

Running this cmdlet updates the Active Directory object specified by the Identity parameter.

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 "Permissions and delegation" entry in the Recipients Permissions topic.


Parameter Required Type Description




The AccessRights parameter specifies the rights needed to perform the operation. Valid values include:

  • FullAccess

  • ExternalAccount

  • DeleteItem

  • ReadPermission

  • ChangePermission

  • ChangeOwner




The Identity parameter specifies the identity of the mailbox that's getting permissions added.

This parameter accepts the following values:

  • Alias

    Example: JPhillips

  • Canonical DN

    Example: Atlanta.Corp.Contoso.Com/Users/JPhillips

  • Display Name

    Example: Jeff Phillips

  • Distinguished Name (DN)

    Example: CN=JPhillips,CN=Users,DC=Atlanta,DC=Corp,DC=contoso,DC=com

  • Domain\Account

    Example: Atlanta\JPhillips

  • GUID

    Example: fb456636-fe7d-4d58-9d15-5af57d0354c2

  • Immutable ID

    Example: fb456636-fe7d-4d58-9d15-5af57d0354c2@contoso.com

  • Legacy Exchange DN

    Example: /o=Contoso/ou=AdministrativeGroup/cn=Recipients/cn=JPhillips

  • SMTP Address

    Example: Jeff.Phillips@contoso.com

  • User Principal Name

    Example: JPhillips@contoso.com




The Instance parameter is no longer used and will be deprecated.




The Owner parameter specifies the owner of the mailbox object.




The User parameter specifies the user mailbox that the permissions are being granted to on the other mailbox.




The AutoMapping parameter specifies whether to ignore the auto-mapping feature in Microsoft Outlook. If a user is granted Full Access permissions to another user's mailbox or to a shared mailbox, Outlook, through Autodiscover, automatically loads all mailboxes to which the user has full access. This parameter accepts $true or $false values.




The Confirm switch can be used to suppress the confirmation prompt that appears by default when this cmdlet is run. To suppress the confirmation prompt, use the syntax -Confirm:$False. You must include a colon ( : ) in the syntax.




The Deny switch specifies whether to deny permissions to the user on the mailbox.




This parameter is available only in on-premises Exchange 2013.

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




The IgnoreDefaultScope parameter instructs the command to ignore the default recipient scope setting for the Exchange Management Shell session and use the entire forest as the scope. This allows the command to access Active Directory objects that aren't currently in the default scope. Using the IgnoreDefaultScope parameter introduces the following restrictions:

  • You can't use the DomainController parameter. The command uses an appropriate global catalog server automatically.

  • You can only use the DN for the Identity parameter. Other forms of identification, such as alias or GUID, aren't accepted.




The InheritanceType parameter specifies whether permissions are inherited by folders within the mailbox.




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.

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