I agree with jfarena, but you have to also click on your exchange account and make sure there is a check mark in Sync Calendar.
I just installed Nitro Notes and it will not sync notes with my Outlook client. It seems to have no option to sync with the exchange server (over the air not supported). So I am thinking this app only works if you are running Outlook Client as a POP3 / SMTP or IMAP set-up. If you run it in Exchange Mode you peobably won't work. Unless I am completely missing something. I followed the instyrutions to a tee and it simply does not sync. It probably is looking for the PST file on my desktop...which I have one from an older setup. I wonder if the note is sitting there in that old PST file. LOL
"Peace through superior firepower" requires actual firepower, not just a trite bumper sticker.
I successfully configured my Samsung Galaxy S (running Froyo) to sync with Zarafa, it should work like that with Exchange, too. The howto I wrote is in German, however, there are screenshots. I want to share it here because jfarena's hint was crucial to me!
Android mit Zarafa-/Exchange-Server synchronisieren 404 Not Found