I actually wanted to post this in the partner newsgroups, but it looks like
the site is down, I get an error saying "Sorry, the page you are looking for
is not on Microsoft.com" or something to the affect.

I have a user that has a few calendar items that aren't showing up in his
Outlook calendar, but they are when he accesses it via OWA or even his
iPhone. I thought it might be something with his PC, so I applied all XP &
Office 2003 updates, but still nothing. To eliminate his PC, I logged on to
his mailbox from another PC, and the same thing happens. I've tried both
Cached (the default) and non-cached. He's running Windows XP & Office 2003,
the Exchange server is 2003 with the latest updates.