yes. it's the same problem as a gmail account as well. I was trying to figure out google sync, when i realized that it doesn't keep anything older than 60 days ( i think that's the max option) on your BB calendar, even if it still has it on the google calendar online. I never did figure out the duplicate entry issue, figured it was tied to the whole gmail duplicate issue (which no one still has not fixed at google) and with the calendar issue, i just deleted sync all together.
