Staff member 'employee' needs access to mailbox 'supervisor' with read only rights
When I use the following command it works like a charm:
Add-MailboxPermission -Identity supervisor -User employee -AccessRights FullAccess -InheritanceType All
I can add the supervisor mailbox in the employee's Outlook and all folders expand and are visible. However setting -AccessRights to FullAccess gives the employee too much control over the supervisor's mailbox.
Unfortunately when I use the following command I can add the mailbox in Outlook but none of the folders expand:
Add-MailboxPermission -Identity supervisor -User employee -AccessRights ReadPermission -InheritanceType All
(Notice how -AccessRigths are set to 'ReadPermission' instead of 'FullAccess'
The workaround was to use Add-MailboxFolderPermission and set the permissions to all subfolders individually.