I'm with dust, i lose my Curve so i can't help step by step, but as far as i remember, you need to install the desktop software but what version do you have, 4.2? 4.3?
You cant sync anything? or just the calendar?
Try to check this section IF the problem is the calendar.
Sorry for the url, but i need to have at least 10 post to put the URL, sendme an email to [email protected] or a private message to send it.