Try this, in Outlook, uncheck download shared folders and close and re-open Outlook and see if you can see the mailbox contents in the left folder pane for those mailboxes you have yourself full mailbox access t o
On the menu select Tools > Account settings
Click on your account, then on Change More Settings then select the Advanced tab.
Clear the "Download shared folders (excludes mail folders)" check box.
Exit and restart Outlook.