To access shared mailboxes you have been granted access to, you will need to be using Mozilla Thunderbird.

Steps to setup Thunderbird so it displays your shared mailboxes:

• Click on the File menu and then the Subscribe option
• Expand the user folder by clicking on the + sign to the left of its folder icon
• Check all shared mailboxes you want to use
• Click OK

The shared mailboxes should now appear in the tree view under your private Inbox in the user folder.