I used to be able to do this with my Palm Vx. Anything I created on the Palm, and marked private would not sync with Outlook. The only calendar syncronization setting is to choose the timeframe for the calendar sync (i.e. 1 week, 2 weeks, 1 month).
Does anyone know if this is possible? I currently have a Motorola Q on Verizon Wireless, running Activesync 4.2