OWA calendar does not sync with outlook

Whenever I enter an appointment in Outlook Web Access (OWA) it will not show up in my normal Outlook calendar. But the reminder does pop up with the entry from OWA. Very frustrating, especially when we are using our calendars to show where we are at all times.
This is not only isolated to me, but the whole company.
We use MS Small Business Server 2003 with the Outlook client from same.
Webmail is set correctly.Everything else works just fine, inbox, calendar (except for above), contacts, public folders etc.