Since my Ozone is my first WM device I am not sure about notes on previous versions.
It may have been replaced by Office Mobile which has OneNote Mobile and Word Mobile.
OneNote Mobile is handy, but unless you have the full pro version of MS Office 2007 you will have to pony up 100 bucks for the OneNote desktop app to read the OneNote notes you make on the phone. They still sync and are saved, but without the desktop app you can't read them on the desktop.
You also can't create a Word .doc in Word Mobile, but you CAN read and edit docs and save them with a new name. So I keep 3 "empty" .docs to use when I want to make a note i can sync and then read on my desktop.
Perhaps this will help folks out when you start looking on the desktop for the OneNote notes and you can't find them in a readable form.
I was and am pretty irritated about it and will not be getting a WM7 device or any other windows mobile phone.