recovering deleted contact or calendar items in outlook 2011

When I delete contacts or calendar items in outlook 2011, they do not appear in "deleted items" - (as is the case on outlook for Windows...)

Is there still a way to recover them, when they are deleted by mistake?

How does the deletion feature work? Does it make a copy of the deleted records somewhere on the harddrive (I checked in the Trash and they dont seem to be there... but maybe somewhere else?)

Thanks for your help!