CmdID

CmdID / PowerShell / Cmdlets / Add

Add-MailboxPermission

Use the Add-MailboxPermission cmdlet to add permissions to a mailbox or to an Exchange Server 2016, Exchange Server 2019, or Exchange Online mail user. Exchange PowerShell reference

From the Exchange PowerShell reference 13 parameters Its page in the reference

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Parameters

13 in the Exchange PowerShell reference
-IdentityThe Identity parameter specifies the mailbox where you want to assign permissions to the user.
-AccessRightsThe AccessRights parameter specifies the permission that you want to add for the user on the mailbox.
-InstanceThis parameter is deprecated and no longer used.
-OwnerThe Owner parameter specifies the owner of the mailbox object.
-UserThe User parameter specifies who gets the permissions on the mailbox.
-AutoMappingThe AutoMapping parameter includes or excludes the mailbox from the auto-mapping feature in Microsoft Outlook.
-Confirm, -cfThe Confirm switch specifies whether to show or hide the confirmation prompt.
-DenyThe Deny switch specifies that the permissions you're adding are Deny permissions.
-DomainControllerThe DomainController parameter specifies the domain controller that's used by this cmdlet to read data from or write data to Active Directory.
-GroupMailboxThe GroupMailbox switch is required to add permissions to a Microsoft 365 Group mailbox.
-IgnoreDefaultScopeThe IgnoreDefaultScope switch tells the command to ignore the default recipient scope setting for the Exchange PowerShell session, and to use the entire forest as the scope.
-InheritanceTypeThe InheritanceType parameter specifies how permissions are inherited by folders in the mailbox.
-WhatIf, -wiThe WhatIf switch shows what the command does without making any changes.