Gosh... I, too, have the exact same problem and narrowed things down a bit... In my case (x51, WM5, ActiveSync 4.1, Outlook 2003 SP2, everything in French), the contacts and events that will not synch from desktop to PPC (PPC to desktop works) are the ones that have notes in them.
I have been looking for a solution for over a month. I keep finding posts of people who have the same issue and no answer, at
all.
I'm desperate because most of my calendar events have notes with them... and they won't sync. No error, nothing, they simply don't appear.
I so wish we could find a solution to this issue
mels