View mailbox permissions

1. Run the command below to get the permission of the mailbox you prefer to check.
Get-MailboxPermission -Identity <Mailbox ID 1> | Format-List

2. Run the following command to get returns permissions that the user A has on test’s mailbox.
Get-MailboxPermission -Identity -User "A"

You may use the commands to query the mailboxes you would like to check.

You should know:

1. To view the permissions assigned to a resource mailbox, please run the following command:
Get-Mailbox [-Identity]

2. You are able to use add-mailboxpermission to set the following valid values: FullAccess, SendAs, ExternalAccount, DeleteItem, ReadPermission, ChangePermission, ChangeOwner.

3. To set permissions on an individual folder, please run the following command:
Set-MailboxFolderPermission -Identity-AccessRights-User