1. Download Tungle (free app) - under Options choose which calendars you want to sync and how often to sync. I synced my MSN account with Tungle.
2. I use my MSN account for my default calendar on my BB. I added my MSN account to my PB email and allowed it to sync my calendar, contacts, etc.
3. Tungle automatically syncs all events from my MSN account with my BB and PB