I've completed a successful mailbox import request into the archive mailbox for a particular user. There are no errors to speak of and the size of the archive mailbox has grown to the expected size after import (approximately 6GB).
However, in OWA I can't see any of the mail folders inside the archive mailbox, only Deleted Items and RSS feeds folders.
From microsoft outlook I exported to a pst and in Crunchbang used readpst to extract it all. From the extracted folder I even dragged and dropped the old emails into claws-mailHowever in the extracted contacts folder the contacts are there and when clicked on they open and identify as vcards.