Suddenly Outlook 2003 does not display any messages in the Inbox, hence it displays the counter with (xx) new messages and is bold. Was working yesterday jsut fine, and this morning nothing is displayed. It gives me access to other folders and displays emails, but nothing in the Inbox. Did a new install of Outlook 2003, same problem.

Does it have a filter in place?Outlook Menu View, Arrange by, current view, Customize Current view, Filter. Does one exist? If so, get rid of it. if not, see if your "Current View" is set to something besides "Messages". If it is, put it back to messages.