I have site with an Exchange 2003 server, and mostly Outlook 2000 and
Outlook 2003 clients. We now have a single Outlook 2007 client, and cannot
view any Sent items on that one. Messages are sent and received without any
problem, however, when I go into the Sent folder, only a few old sent items
are there. There are no PST files in this profile.

What could be the problem?