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Get-EXOMailboxPermission

Use the Get-EXOMailboxPermission cmdlet to retrieve permissions on a mailbox. Exchange PowerShell reference

From the Exchange PowerShell reference 8 parameters Its page in the reference

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Parameters

8 in the Exchange PowerShell reference
-ExternalDirectoryObjectIdThe ExternalDirectoryObjectId parameter identifies the mailbox that you want to view by the ObjectId in Microsoft Entra ID.
-IdentityThe Identity parameter specifies the mailbox you want to view.
-OwnerThe Owner switch returns the owner information for the mailbox that's specified by the Identity parameter.
-PrimarySmtpAddressThe PrimarySmtpAddress identifies the mailbox that you want to view by primary SMTP email address (for example, navin@contoso.com).
-ResultSizeThe ResultSize parameter specifies the maximum number of results to return.
-SoftDeletedMailboxThe SoftDeletedMailbox switch is required to return soft-deleted mailboxes in the results.
-UserThe User parameter returns information about the user who has permissions to the mailbox specified by the Identity parameter.
-UserPrincipalNameThe UserPrincipalName parameter identifies the mailbox that you want to view by UPN (for example, navin@contoso.onmicrosoft.com).