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. However if I run some cmdlets to list the contents of the Archive Mailbox\Inbox folder in the Exchange Shell, the full list of subfolders will come up.

If I do a mail item search on the archive mailbox, emails from those individual folders appear as search results! I just can't see the folders in the navigation pane and hence cannot browse any of my old emails.

Any help would be appreciated.