hi bro i have the following

iphone 3g with version 3.1 (jailbreaked)
itunes 9 latest

my problem is when i sync to my microsoft outlook 2007, everything sync like contacts, bookmark, mails, etc....only thing is the calendar does not sync...I have reformated my pc and reinstall fresh + reinstall itunes fresh and did a fresh restore on the iphone, but same problem.......how to get the calendar from my ms outlook 2007 to sync to my iphone??