One user (of 200) is unable to display the Inbox contents while using OWA. All folders are visible, and only Inbox is inaccessible. Problem appears to be client machine and location independent: fails under Windows XP, Ubuntu 8.04, OS X; and in the case of Windows, under both Firefox and IE. All other users connect, whether with standard Outlook client (XP and 2007), or by OWA. Problem account has not had issues with Outlook client; and OWA functions correctly 10% of the time. Symptoms occur, whether using OWA on internal LAN, or through internet.
Exchange is running on Server 2003 SE, SP2, with all known updates.