I've setup a shared mailbox on our Exchange 2010/SBS2011 server. I've added some users as Full permission-users on this mailbox, and when they open Outlook/login to OWA the mailbox is automatically opened. Great stuff.
However, only the Inbox folder is visible, and the alternative to create a folder is grayed out. If they open the mailbox explicitly (for instance in OWA by clicking open other user's mailbox) they can see other folders, as well as create new ones. What configuration is needed to be able to view and create subfolders directly?