Blackberry Sync issues w/Exchange

I have no idea where to post this question. But – the issue is with BlackBerry Enterprise Server 4.1 for Exchange. It is Exchange 2003 w/SP1. The BES says “enabled”. The calendar DOES sync from desktop (Outlook 2003) to the BlackBerry. But when you modify the calendar on the blackberry – it DOES NOT sync to the desktop (Outlook 2003/Exchange).

Anyone have experience with this? Thanks in advance.